2023/11/01 更新

写真a

タケシタ ヒロキ
竹下 宏樹
TAKESHITA Hiroki
所属
先端工学研究院
部局
工学部 材料化学科
職名
准教授
外部リンク

学歴

  • 京都大学   大学院工学研究科   高分子化学専攻

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    修了課程: 博士課程

    国名: 日本国

  • 京都大学   工学部   高分子化学科

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    国名: 日本国

  • 京都大学

  • 京都大学

  • 京都大学   工学研究科   高分子化学専攻

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    国名: 日本国

学位

  • 博士(工学) ( 2001年5月   京都大学 )

研究キーワード

  • 光散乱

  • 高分子の結晶化

  • 液晶性高分子

  • X線散乱

  • 高分子物性

  • 高分子構造

  • 高分子ゲル

  • Polymer Structure

  • Polymer Physics

  • 高分子構造

  • 高分子物性

  • 散乱法

▼全件表示

経歴

  • 滋賀県立大学   工学部 材料科学科   准教授

    2014年4月 - 現在

  • 長岡技術科学大学   大学院工学研究科   助教

    2007年4月 - 2014年3月

  • 長岡技術科学大学   大学院工学研究科   助手

    1998年4月 - 2007年3月

  • 長岡技術科学大学 工学部 物質・材料系   助教,助教

所属学協会

  • 高分子学会

  • プラスチック成形加工学会

  • 日本レオロジー学会

  • 放射光学会

  • 日本ゴム協会

  • 応用糖質学会

  • 繊維学会

  • Society of Polymer Science Japan

▼全件表示

研究分野

  • ナノテク・材料 / 高分子材料

  • ナノテク・材料 / 高分子化学

  • ナノテク・材料 / 高分子材料

研究シーズ

  • 多成分多相系高分子材料における構造形成機構

論文

  • Thermally modified bamboo-eggshell adsorbent for phosphate recovery and its sustainable application as fertilizer 査読

    Sarker P., Liu X., Hata N., Takeshita H., Miyamura H., Maruo M.

    Environmental Research   231   2023年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Environmental Research  

    Phosphate recovery from wastewater using readily available biowaste-based adsorbents is beneficial for both eutrophication control and waste management. Bamboo char has a high-density porous structure and eggshell contains CaCO3 with high affinity for phosphate. The combination of calcined bamboo and eggshell is a potential adsorbent for P recovery that has not been tested previously. Because bamboo char and eggshell both are popular for soil amendment, a P-loaded bamboo and eggshell composite is a promising fertilizer for long-term soil improvement. In this work, the feasibility of calcined bamboo and eggshell (BE) for P recovery and its use as fertilizer were investigated. The adsorption capacity and mechanism were examined using adsorption kinetic, isotherm, and thermodynamic analysis. The kinetic study showed that the experimental data sets were fitted best by a pseudo second-order model, indicating chemisorption. The Langmuir isotherm model estimated maximum adsorption capacities of 95.14 and 98.40 mg/g for BE 1:1 and 2:1 adsorbent. Monolayer adsorption occurred on a homogenous surface. The adsorption reaction was non-spontaneous at 298 K and exothermic for the BE 1:1 and 2:1 adsorbent, and the calculated Langmuir separation factor indicated favorable conditions for P adsorption. The desorption study showed lower P desorption capacity in water than in neutral ammonium citrate. P-loaded eggshell-modified bamboo char was an effective slow-release fertilizer for Japanese mustard spinach cultivation, which is a sustainable and environment friendly use of P-loaded materials.

    DOI: 10.1016/j.envres.2023.115992

    Scopus

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  • Analysis of Ethylene Copolymers with Long-Chain α-Olefins (1-Dodecene, 1-Tetradecene, 1-Hexadecene): A Transition between Main Chain Crystallization and Side Chain Crystallization 査読

    Kitphaitun S., Takeshita H., Nomura K.

    ACS Omega   7 ( 8 )   6900 - 6910   2022年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ACS Omega  

    A series of ethylene copolymers with long-chain α-olefins [LCAOs, 1-dodecene (DD), 1-tetradecene (TD), 1-hexadecene (HD)] and various LCAO contents were prepared, and their thermal properties, including effects of LCAO content and side chain length, were explored. The Cp*TiCl2(O-2,6-iPr2-4-SiEt3-C6H2)-MAO catalyst system afforded rather high-molecular-weight copolymers with unimodal molecular weight distributions and uniform compositions (confirmed by DSC thermograms). In addition to the melting temperatures (Tm values) corresponding to the so-called main chain crystallization (samples with low LCAO contents, the Tm value decreased upon increasing the LCAO content) and the side chain crystallization [polymer samples with high LCAO contents, by intermolecular interaction of side chains as observed in poly(DD), poly(TD), and poly(HD)], the other Tm value was observed, especially in poly(ethylene-co-HD)s (assumed to be due to co-crystallization of the branch and the main chain through an interaction of the main chain and the long side chains). The presence of another crystalline phase in poly(ethylene-co-HD)s was also suggested by a wide-angle X-ray diffraction (WAXD) analysis. These Tm values in poly(ethylene-co-TD)s and poly(ethylene-co-DD)s with rather high TD or DD contents were affected by the heating conditions in the measurement of DSC thermograms (5 or 10 °C/min), suggesting that the driving force for formation of the crystal packing (observed as Tm) is weak and affected by the alkyl side chain lengths.

    DOI: 10.1021/acsomega.1c06560

    Scopus

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  • Augmented Self-Association by Electrostatic Forces in Thienopyrrole-Fused Thiadiazoles that Contain an Ester instead of an Ether Linker 査読

    Naito Y., Moriguchi R., Kitamura C., Matsumoto T., Yoshihara T., Ishi-i T., Nagata Y., Takeshita H., Yoshizawa K., Shiota Y., Suzuki K., Kato S.i.

    Chemistry - An Asian Journal   17 ( 4 )   2022年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Chemistry - An Asian Journal  

    During the self-assembly of π-conjugated molecules, linkers and substituents can potentially add supportive noncovalent intermolecular interactions to π-stacking interactions. Here, we report the self-assembly behavior of thienopyrrole-fused thiadiazole (TPT) fluorescent dyes that possess ester or ether linkers and dodecyloxy side chains in solution and the condensed phase. A comparison of the self-association behavior of the ester- and ether-bridged compounds in solution using detailed UV-vis, fluorescence, and NMR spectroscopic studies revealed that the subtle replacement of the ether linkers by ester linkers leads to a distinct increase in the association constant (ca. 3–4 fold) and the enthalpic contribution (ca. 3 kcal mol−1). Theoretical calculations suggest that the ester linkers, which are in close proximity to one another due to the π-stacking interactions, induce attractive electrostatic forces and augment self-association. The self-assembly of TPT dyes into well-defined 1D clusters with high aspect ratios was observed, and their morphologies and crystallinity were investigated using SEM and X-ray diffraction analyses. TPTs with ester linkers exhibit a columnar liquid crystalline mesophase in the condensed phase.

    DOI: 10.1002/asia.202101341

    Scopus

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  • Effects of Copolymer Composition on Phase Transition Behavior and Mobility of Mesogenic Group for Side-Chain Liquid Crystalline-Amorphous Random Copolymers 査読

    Takeshita H., Kanazawa A., Tokumitsu K.

    Nihon Reoroji Gakkaishi   50 ( 2 )   189 - 195   2022年1月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Nihon Reoroji Gakkaishi  

    Liquid crystalline (LC) phase behavior, higer-order structure, and mobility of mesogenic groups were investigated by using DSC, polarizing optical microscopy, small-angle X-ray scattering (SAXS), wide-angle X-ray diffraction (WAXD) and dielectric relaxation spectroscopy (DRS) for random copolymers composed of cyanobiphenyl-based side-chain LC and the amorphous components with various compositions. LC phase behavior of the copolymers was systematically changed depending on the mole fraction of the LC component, fLC11. When fLC11 > 0.75, incorporation of small fraction of the amorphous component resulted in slightly highered LC order and almost unchanged LC-isotropic transition temperature, Tiso. This may be because the copolymerization of the amorphous component canceled the inherent frustration in the LC homopolymer, which comes from the dissidence between lateral distance of adjacent nearest mesogenic groups in the smectic LC phase and that of the side-chains on mainchain. According to the DRS measurements, incorporation of the amorphous component also accelerated the molecular mobility of the mesogenic groups, which may be also related to the relaxation of the internal conformational frustration because of the dissidence.

    DOI: 10.1678/rheology.50.189

    Scopus

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  • Relationship between Dynamic Viscoelasticity and Amorphous Structural Changes Associated with Enthalpy Relaxation in Polystyrene Injection Moldings 査読

    Tao K., Yamada K., Hatano A., Takeshita H., Higashi S., Kago K., Kuwashiro S., Hirano H., Tokumitsu K.

    Nihon Reoroji Gakkaishi   50 ( 2 )   181 - 187   2022年1月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Nihon Reoroji Gakkaishi  

    In this study, we investigated the relationship between the amorphous structural changes associated with enthalpy relaxation and the Heat distortion temperature (HDT) in polystyrene injection moldings. It was clarified that the longer heat treatment time, the more enthalpy relaxation progressed. Also, an extrapolation glass transition temperature (Tig) increased by heat treatment. In addition, long-time heat treatment caused the high-temperature shift of the storage modulus (E') decrease temperature near glass transition temperature (Tg). Since the increase in Tig and the high-temperature shift of E' decrease temperature correlated with the enthalpy relaxation, they can be closely related to the enthalpy relaxation. Thus, we considered that the segment motion of polymer chain was suppressed as the enthalpy relaxation progressed. At long-term heat treatment, the enthalpy relaxation and the HDT were correlated. Furthermore, density increased by the heat treatment, and the increase in density also correlated with the progress of the enthalpy relaxation. Therefore, we considered that the polymer chains densely packed along with the enthalpy relaxation. As the result of polymer chains being densely packed, the segment motion of polymer chains near Tg can be suppressed and the HDT increased.

    DOI: 10.1678/rheology.50.181

    Scopus

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  • Structure-property correlation of crosslinked domain hydrogels exhibiting thermoresponsive mechanical toughening and hybridization with photoluminescent carbon dots 査読

    Ida S., Okuno T., Morimura M., Suzuki K., Takeshita H., Oyama M., Nakajima K., Kanaoka S.

    Polymer Chemistry   2022年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Polymer Chemistry  

    A hydrogel exhibiting stimuli-responsive simultaneous change in multiple properties is attractive for various applications. We have recently developed a gel with a thermoresponsive crosslinked domain (CD) structure, which underwent mechanical toughening upon heating in air with maintenance of high transparency. In this study, we evaluated the structure-property correlation of a hydrogel having a thermoresponsive CD structure prepared by a polymerization-induced self-assembly (PISA) process using reversible addition-fragmentation chain transfer (RAFT) polymerization of N-isopropylacrylamide (NIPAAm) with a hydrophilic poly(N,N-dimethylacrylamide) (PDMAAm) macro-chain transfer agent (macro-CTA). The molecular weight of the macro-CTA had a slight effect on the swelling behavior of the product gels in water, while a macro-CTA with an appropriate molecular weight yielded a gel exhibiting pronounced mechanical toughening with an increased elastic modulus and elongation upon heating. The composition of the gel significantly affected its mechanical properties and transparency at a high temperature, and we found that a gel with an NIPAAm content as high as 50% maintained the transparency due to an internal structure with homogeneously dispersed CDs in the network. In addition, we successfully obtained a gel exhibiting simultaneous mechanical toughening and enhanced photoluminescence upon heating by hybridization with carbon dots.

    DOI: 10.1039/d2py00423b

    Scopus

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  • Design of Hydrogels with Thermoresponsive Crosslinked Domain Structures via the Polymerization-Induced Self-Assembly Process and Their Thermoresponsive Toughening in Air 査読

    Morimura M., Ida S., Oyama M., Takeshita H., Kanaoka S.

    Macromolecules   54 ( 4 )   1732 - 1741   2021年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Macromolecules  

    We designed a hydrogel with a thermoresponsive crosslinked domain (CD) structure, which expressed thermoresponsive toughening in an isochoric manner in air. The responsive behavior of conventional thermoresponsive hydrogels is usually a macroscopic volume change along with water transfer to and from the outside of the polymer network. In order to expand the scope of thermoresponsive hydrogels, a network design that requires no external water for thermoresponsive transition has been demanded. To this end, we focused on the polymerization-induced self-assembly process for the direct synthesis of gels with designed domains and performed reversible addition-fragmentation chain transfer polymerization of N-isopropylacrylamide in water at a high temperature using a bifunctional macro-chain transfer agent, yielding a transparent gel. The structural analysis of the obtained gel revealed that dispersed CDs reversibly swelled and shrunk in response to temperature change in air without aggregation. Such an internal structural change induced the increase of elastic modulus and elongation at a high temperature.

    DOI: 10.1021/acs.macromol.0c02569

    Scopus

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  • The relationship between the change in dynamic viscoelasticity by heat treatment and heat resistance in polystyrene moldings 査読

    TAO K., YAMADA K., HIGASHI S., TAKESHITA H., TOKUMITSU K.

    Zairyo/Journal of the Society of Materials Science, Japan   70 ( 1 )   11 - 16   2021年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Zairyo/Journal of the Society of Materials Science, Japan  

    The mechanism of heat resistance improvement of polystyrene injection moldings by heat treatment was studied. The increase in the Heat Distortion Temperature (HDT) by heat treatment was confirmed. Meanwhile, in dynamic viscoelasticity measurement, the shoulder of the loss tangent (tanδ) appeared at 60 to 90°C in untreated specimen. In the heat-treated specimen, the shoulder at that temperature range disappeared. Further, when the frequency dependence of tanδ was evaluated, it was found that the mobility of molecular chain in the main dispersion did not change by the heat treatment, and the mobility in the temperature range where the tanδ shoulder appeared was reduced by the heat treatment. By differential scanning calorimetry, the progress of enthalpy relaxation by heat treatment was confirmed. Also, excellent correlation existed between the progress of enthalpy relaxation and the disappearance of the tanδ shoulder by heat treatment. Since the tanδ shoulder disappeared in the heat-treated specimen in which relaxation has progressed yet, it was considered that the tanδ shoulder was caused by molecular motion accompanying the relaxation phenomenon. Addisionally, as well as the disappearance of the tanδ shoulder, the increase in HDT correlated with the progress of enthalpy relaxation by heat treatment. In conclusion, with the progress of the relaxation by the heat treatment, the tanδ shoulder disappeared, and thereby the molecular mobility at 60 to 90°C decreasesed. Since the HDT of the untreated specimen was 78°C, the HDT increased due to the decrease in the molecular mobility below 78°C by heat treatment. Thus, it is considered that the increase in HDT correlated with the progress of enthalpy relaxation by heat treatement.

    DOI: 10.2472/jsms.70.11

    Scopus

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  • ポリシラン添加ポリエチレンの光および熱劣化に関する研究 査読

    鈴木 秀哉 , 竹下 宏樹 , 徳満 勝久

    成形加工学会誌   32 ( 12 )   428 - 433   2020年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Multiarm Star-Crosslinked Hydrogel: Polymer Network with Thermoresponsive Free-End Chains Densely Connected to Crosslinking Points 査読

    Ida S., Toda S., Oyama M., Takeshita H., Kanaoka S.

    Macromolecular Rapid Communications   2020年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Macromolecular Rapid Communications  

    Soft tissue in biological system is a hydrogel with elaborate structure exhibiting repeatable dynamic function. In order to approach such sophisticated system, precise construction of a designed network with multi-components is desired. This communication presents a novel hydrogel having highly dense stimuli-responsive free-end chains around crosslinking structure. A key molecule is a core-crosslinked star-shaped polymer with multiple thermoresponsive arms, which can be prepared by reversible addition–fragmentation chain transfer polymerization of divinyl crosslinker with poly(N-isopropylacrylamide) (PNIPAAm) macro-chain transfer agent and have a number of unreacted carbon–carbon double bonds in the core. These unreacted double bonds can be utilized as a crosslinker for poly(acrylamide) (PAAm) gel synthesis by free radical polymerization. The obtained gel contains homogeneously dispersed star PNIPAAms as crosslinking points and exhibits thermoresponsive swelling behavior in water depending on the star contents. In particular, the gel with low content of the star crosslinker shows localized responsive behavior with expansion and shrinkage of the star in one molecule. The mechanical properties of the star-crosslinked gel are significantly high compared to the conventional PAAm gels particularly in compressive strength (≈9 MPa). Moreover, the star-crosslinked gel has thermoresponsive mechanical toughening property.

    DOI: 10.1002/marc.202000558

    Scopus

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  • 新規ポリオレフィン材料の低温力学物性と分子運動性に関する研究 査読

    梅本叡史,徳満勝久,竹下宏樹,竹内大介,小坂田耕太郎

    日本材料学会 材料   68 ( 1 )   47 - 53   2019年1月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • 側鎖1,2ジオール結合を有するエチレンビニルアルコール共重合体とナイロン6-66ブレンド物の高圧水素耐性と分散状態の関係 査読

    澁谷光夫,徳満勝久,竹下宏樹,住野翔郷,西村伸,藤原広匡

    日本材料学会 材料   68 ( 1 )   34 - 41   2019年1月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • 熱融着法による籾殻活性炭複合材料の物性評価研究 査読

    宮原和美,徳満勝久,竹下宏樹,脇坂 博之

    マテリアルライフ学会誌   30 ( 3 )   52 - 63   2018年10月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:マテリアルライフ学会   参加形態:共同(副担当)  

  • Anionic Polymerization of 2-Hexyl[3]dendralene 査読

    Takamura Y., Takenaka K., Toda T., Takeshita H., Miya M., Shiomi T.

    Macromolecular Chemistry and Physics   219 ( 1 )   2018年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Macromolecular Chemistry and Physics  

    © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim In this study, the polymerization behavior of 2-hexyl[3]dendralene (H3D), which is an alkyl-group-derived [3]dendralene, is examined. The polymerization of H3D in tetrahydrofuran (THF) at −78 °C with potassium naphthalenide as the initiator affords poly(H3D) with a narrow molecular weight distribution, although a small shoulder peak is observed at a high molecular weight even before the monomer is completely consumed. The molecular weight distribution of poly(H3D) prepared in heptane is broader than that prepared in THF, indicating that the nucleophilic addition of a propagating carbanion to the carbon–carbon double bond in the polymer chain occurs in addition to polymerization. Furthermore, the microstructure of poly(H3D) is investigated by NMR. Signals corresponding to the conjugate addition structure, that is, 1,4- and 4,6-structures, are exclusively observed. Poly(H3D) prepared in heptane contains a higher content of the 4,6-structures compared with those prepared in THF.

    DOI: 10.1002/macp.201700046

    Scopus

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  • 高分子ブレンドの結晶化における成分間相分離の効果 招待

    竹下宏樹

    成形加工   28 ( 7 )   279 - 282   2016年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • 高分子の結晶化におけるナノスケール相構造の効果 招待

    竹下宏樹

    成形加工   27 ( 7 )   280 - 283   2015年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • ポリシラン添加によるPP/nano-Sio2複合材料の物性改質効果に関する研究 査読

    福井雄哉, 竹下宏樹, 山下義裕, 徳満勝久, 福西佐季子, 高野一史, 伊藤賢志

    材料試験技術   60 ( 3 )   152 - 158   2015年3月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Anionic Polymerization of 2‐Phenyl[3]dendralene and 2‐(4- Methoxyphenyl)[3]dendralene

    K. Takenaka, S. Amamoto, H. Kishi, H. Takeshita, M. Miya, T. Shiomi

    Macromolecules   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Crystallization Behavior and Higher-order Structure in Miscible Crystalline/Crystalline Polymer Blends

    F. Arai, K. Shinohara, N. Nagasawa, H. Takeshita, K. Takenaka, M. Miya, T. Shiomi

    Polymer Journal   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Crystallization and Higher-Order Structure of Multicomponent Polymeric Systems 招待

    H. Takeshita, T. Shiomi, K. Takenaka, F. Arai

    Polymer   2013年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Crystallization Behavior and Chain Folding Manner of Cyclic, Star and Linear Poly(tetrahydrofuran)s

    H. Takeshita, M. Poovarodom, T. Kiya, F. Arai, K. Takenaka, M. Miya, T. Shiomi

    PolymerSen’I Gakkaishi   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Structural and Thermal Properties of Unpurified and Purified 12-Hydroxystearic Acid Solutions

    H. Takeno, A. Maehara, M. Kuchiishi, K. Yoshiba, H. Takeshita, S. Kondo, T. Dobashi, M. Takenaka, H. Hasegawa

    Polymer, 53(3)   2012年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Synthesis of peroxide-curable butyl rubber via Suzuki-Miyaura coupling of halogenated butyl rubber with 4-vinylphenylboronic acid

    K. Takenaka, M. Suzuki, H. Takeshita, M. Miya, T. Shiomi, K. Tamamitsu, T. Konda

    Polymer Journal   2012年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Effects of Liquid-Liquid Phase Separation on Crystallization of Poly(ethylene glycol) in Blends with Isotactic Poly(methyl methacrylate)

    F. Arai, H. Takeshita, M. Dobashi, K. Takenaka, M. Miya, T. Shiomi

    Journal of Polymer Science Part A: Polymer Chemistry   2012年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Structure and dynamics of poly(vinyl alcohol) gels in mixtures of dimethyl sulfoxide and water

    T. Kanaya, N. Takahashi, H. Takeshita, M. Ohkura, K. Nishida, K. Kaji

    e-Journal of Soft Materials   2012年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Effect of Lithium Compounds on the SN2 Reaction of Anionic Living Polyisoprene with 4-Bromobutoxy-tert-butyldimethylsilane in Heptane

    K. Takenaka, K. Koyasu, K. Yamamoto, M. Miya, H. Takeshita, T. Shiomi

    Journal of Polymer Science Part A: Polymer Chemistry   2010年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Anionic Polymerization of N,N-dialkyl-2-methylenebut-3-enamide. -Effect of alkyl substituents on polymerization behavior-

    K. Takenaka, N. Shibata, A. Oshikiri, M. Miya, H. Takeshita,, T. Shiomi

    Polymer Journal   2010年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Crystallization of Graft Copolymers 1. Graft Chains Miscible with Main Chains

    H. Takeshita, G. Sasagawa, K. Takenaka, M. Miya, T. Shiomi

    Polymer International   2010年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Polymerization of 1,3-Dienes Containing Functional Groups 8. Free-radical Polymerization of 2-Triethoxysilyl-1,3-butadiene

    K. Takenaka, S. Kawamoto, M. Miya, H. Takeshita,, T. Shiomi

    Polymer   2010年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Formation of Phase Structure and Crystallization Behavior from Disordered Melt for Ethylene-Isoprene Block Copolymers and Their Blends

    H. Takeshita, Y. -J Gao, Y. Takata, K. Takenaka, T. Shiomi, C. Wu

    Journal of Polymer Science Part B: Polymer Physics   2010年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Laser Speckle Analysis on Correlation between Gelation and Phase Separation in Aqueous Methyl Cellulose Solutions

    H. Takeshita, K. Saito, M. Miya, K. Takenaka, T. Shiomi

    Colloid and Polymer Science   2010年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Polymerization of 1,3-Dienes with Functional Groups. 5. RAFT Polymerization of N,N-diethyl-2-methylene-3-butenamide

    K. Takenaka, M. Matsui, H. Takeshita, M. Miya, T. Shiomi

    高分子論文集   2009年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Fast Shrinking Kinetics of Poly(N-isopropylacrylamide) Hydrogels Containing a Nonionic Surfactant

    H. Takeshita, M. Sano, K. Wada, K. Tamura, K. Takenaka, T. Shiomi

    日本ゴム協会誌   2009年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Suzuki-Miyauraカップリングを用いた側鎖に4-ビニルフェニル基を有するブチルゴムの合成

    鈴木麻純, 竹下宏樹, 宮 正光, 竹中克彦, 塩見友雄, 玉光賢次, 今田俊洋

    e-Journal of Soft Materials   2009年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • 官能基を有する1,3-ジエン類の重合 第7報−イソプレンホスホン酸ジエチルのラジカル重合

    竹中克彦, 西田敏博, 竹下宏樹, 宮 正光, 塩見友雄

    Polymer   2009年2月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Phase Behavior and Structure Formation for Diblock Copolymers Composed of Side-chain Liquid Crystalline and Glassy Amorphous Components

    H. Takeshita, S. Taniguchi, M. Arimoto, M. Miya, Takenaka, T. Shiomi

    Polymer Journal   2009年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Polymerization of 1,3-Dienes with Functional Groups. 4. Anionic Polymerization of N,N-diethyl-2-methylene-3-butenamide

    K. Takenaka, N. Shibata, S. Tsuchida, H. Takeshita, M. Miya, T. Shiomi

    Polymer   2008年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Polymerization of 1,3-dienes containing functional groups. 6. Unexpected collapse of monomer structure in the anionic polymerization of 2-ethoxymethyl-1,3-butadiene

    K. Takenaka, Y. Akagawa, H. Takeshita, M. Miya, T. Shiomi

    e-Journal of Soft Materials   2008年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Structure Formation and Crystallization Behavior of Ethylene-Isoprene Block Copolymers and Their Blends with Corresponding Homopolymers

    Y.-J. Gao, H. Takeshita, Y. Takata, K. Takenaka, T. Shiomi

    e-Journal of Soft Materials   2008年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Phase Behavior in Liquid Crystallization for Diblock Copolymers Consisting of Rubbery Amorphous and Side-chain Liquid Crystalline Components

    S. Taniguchi, H. Takeshita, M. Arimoto, M. Miya, Takenaka, T. Shiomi

    Polymer   2008年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Formation of Phase Structure and Crystallization Behavior in Blends Containing Polystyrene-Polyethylene Block Copolymers

    H. Takeshita, Y.-J. Gao, T. Natsui, E. Rodriguez, M. Miya, K. Takenaka, T. Shiomi

    Polymer   2007年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • 4-トリメチルシリル-1-ブテン-3-インのアニオン重合とミクロ構造に及ぼす溶媒効果

    小俣 貴嗣, 砂田 潔, 竹下 宏樹, 宮 正光, 竹中 克彦, 塩見 友雄

    高分子論文集   2007年10月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Formation of Lamellar Structure by Competition in Crystallization of Both Components for Crystalline-Crystalline Block Copolymers

    H. Takeshita, K. Fukumoto, T. Ohnishi, T. Ohkubo, M. Miya K. Takenaka, T. Shiomi

    Polymer   2006年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Miscibility in blends of linear and branched poly(ethylene oxide) with methacrylate derivative random copolymers and estimation of segmental χ parameters

    H. Takeshita, T. Shiomi, T. Suzuki, T. Sato, M. Miya, K. Takenaka, 他5名

    Polymer   2005年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Crystallization and structure formation of block copolymers containing a Glassy amorphous component

    H. Takeshita, N. Ishii, C. Araki, M. Miya, K. Takenaka, T. Shiomi

    Journal of Polymer Science Part B: Polymer Physics   2004年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Polymerization of 1,3-Dienes with Functional Groups III Free-Radical Polymerization of N,N-diethyl-2-methylene-3-butenamide

    T. Yaegashi, S. Yodoya, M. Nakamura, H. Takeshita, K. Takenaka, T. Shiomi

    Journal of Polymer Science Part A: Polymer Chemistry   2004年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • トリエトキシシリル基を有する変性SBRラテックスの合成とin situシリカ充てん

    砂田潔, 竹下宏樹, 宮正光, 中村僚, 竹中克彦, 塩見友雄

    日本ゴム協会誌   2003年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Polymerization of 1,3-Dienes with Functional Groups. II Free-Radical Polymerization of N-(2-methylene-3-butenoyl)piperidine

    T. Yaegashi, H. Takeshita, K. Takenaka, T. Shiomi

    Journal of Polymer Science Part A: Polymer Chemistry   2003年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Crystallization and Structure Formation of Block Copolymers Containing a Rubbery Amorphous Component

    T. Shiomi, H. Takeshita, H. Kawaguchi, M. Nagai, K. Takenaka, M. Miya

    Macromolecules   2002年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Crystallization Process in Binary Blends of Poly(ε-caprolactone)-block-polybutadiene Copolymers

    S. Tanimoto, K. Ito, S. Sasaki, H. Takeshita, S. Nojima

    Polymer Journal   2002年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Small-angle Neutron Scattering Studies on Network Structure of Transparent and Opaque PVA Gels

    H. Takeshita, T. Kanaya, K. Nishida, K. Kaji

    Physica B   2002年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Spinodal Decomposition and Syneresis of PVA Gel

    H. Takeshita, T. Kanaya, K. Nishida, K. Kaji

    Macromolecule   2001年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Crystallization of Semicrystalline Block Copolymers Containing a Glassy Amorphous Component

    T. Shiomi, H. Tsukada, H. Takeshita, K. Takenaka, Y. Tezuka

    Polymer   2001年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Appearance of Double Spherulites like Concentric Circles for Poly(ε-caprolactone)-block-poly(ethylene glycol)-block-poly(ε-caprolactone)

    T. Shiomi, K. Imai, K. Takenaka, H. Takeshita, H. Hayashi, Y. Tezuka

    Polymer   2001年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(副担当)  

  • Hierarchic Structure of Poly(vinyl alcohol) Gels As Revealed by Scattering Techniques

    Hiroki TAKESHITA

    2001年3月

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    記述言語:英語   掲載種別:学位論文(博士)  

  • Ultra-Small Angle Neutron Scattering (USANS) Studies on Phase Separation of Poly(vinyl alcohol) Gels

    H. Takeshita, T. Kanaya, K. Nishida ,K. Kaji, T. Takahashi, M. Hashimoto

    Physical Review - Section E   2000年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Gelation Process and Phase Separation of PVA Solutions As Studied by a Light Scattering Technique

    H. Takeshita, T. Kanaya, K. Nishida, K. Kaji

    Macromolecules   1999年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • ポリビニルアルコールゲルの階層構造

    竹下宏樹, 金谷利治, 梶 慶輔, 西田幸次, 西小路祐一, 大倉正寿

    高分子論文集   1998年10月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Micro- and Mesoscopic Structure of Poly(vinyl alcohol) Gels Determined by Neutron and Light Scattering

    T. Kanaya, H. Takeshita, Y. Nishikoji, M. Ohkura, K. Nishida, K. Kaji

    Supramolecular Science   1998年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

  • Gelation Process of Poly(vinyl alcohol) As Studied by Small-Angle Neutron and Light Scattering

    T. Kanaya, M. Ohkura, H. Takeshita, K. Kaji, K. Furusaka, M. Yamaoka

    Macromolecules   1995年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   参加形態:共同(主担当)  

▼全件表示

書籍等出版物

  • 環状高分子の合成と機能発現

    塩見友雄,竹下宏樹( 担当: 分担執筆)

    (株)シーエムシー出版  2018年12月  ( ISBN:978-4-7813-1399-3

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    記述言語:日本語   著書種別:学術書

  • ブロック共重合体の構造制御と応用展開

    竹下宏樹( 担当: 分担執筆)

    (株)シーエムシー出版  2018年12月  ( ISBN:978-4781313511

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    記述言語:日本語   著書種別:学術書

  • Topological Polymer Chemistry: Progress of cyclic polymers in synthesis, properties and functions, Chapter 15, Crystallization of Cyclic and Branched Polymers

    H. Takeshita, T. Shiomi( 担当: 共著)

    World Scientific Publishing  2013年2月 

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    記述言語:英語   著書種別:学術書

  • ポリマーアロイの相溶化と混練条件の最適化, 6章1節, ナノ分散構造形成のメカニズム

    塩見友雄, 竹下宏樹( 担当: 共著)

    技術情報協会  2010年8月 

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    記述言語:日本語   著書種別:学術書

  • ポリマーアロイの相溶化と混練条件の最適化, 第1章3節, 多成分系高分子の結晶化・液晶化と高次構造形成

    竹下宏樹, 塩見友雄( 担当: 共著)

    技術情報協会  2010年8月 

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    記述言語:日本語   著書種別:学術書

  • ソフトマテリアルの新展開,第22章, 「ブロック共重合体における結晶相を含むミクロ相構造の制御」

    塩見友雄, 竹下宏樹( 担当: 共著)

    シーエムシー出版  2004年12月 

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    記述言語:日本語   著書種別:学術書

▼全件表示

MISC

  • Formation of Hierarchical Structure in Liquid Crystalline Block Copolymers 招待

    H. Takeshita, S. Adachi, S. Taniguchi, K. Takenaka, M. Miya, T. Shiomi

    Transactions on GIGAKU   2012年7月

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    記述言語:英語   掲載種別:速報,短報,研究ノート等(学術雑誌)   参加形態:共同(主担当)  

  • Fast shrinking kinetics of poly(N-isopropylacrylamide) hydrogels containing a nonionic surfactant

    Hiroki Takeshita, Midori Sano, Kotaro Wada, Keita Tamura, Masamitsu Miya, Katsuhiko Takenaka, Tomoo Shiomi

    COLLOID AND POLYMER SCIENCE   287 ( 10 )   1123 - 1129   2009年10月

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    記述言語:英語   出版者・発行元:SPRINGER  

    Shrinking kinetics of poly(N-isopropylacrylamide) gels prepared in the presence of a nonionic surfactant C9PE10 was investigated. The shrinking rate of the gels containing more than 6 wt.% of C9PE10 showed about a thousand-fold increase. From the analysis of the shrinking process and the small-angle X-ray scattering profiles, the fast shrinking kinetics was attributed to the incorporation of spatial heterogeneity of the network structure, which is caused by the addition of the surfactant.

    DOI: 10.1007/s00396-009-2069-1

    Web of Science

  • 液晶性ブロック共重合体の相構造形成におけるミクロ相分離と液晶化の相関 招待

    竹下 宏樹, 谷口 真一, 宮 正光, 竹中 克彦, 塩見 友雄

    PF News   2009年4月

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    記述言語:日本語   掲載種別:速報,短報,研究ノート等(学術雑誌)   参加形態:共同(主担当)  

  • Phase behavior and structure formation for diblock copolymers composed of side-chain liquid crystalline and glassy amorphous components

    Hiroki Takeshita, Shin-ichi Taniguchi, Mitsuo Arimoto, Masamitsu Miya, Katsuhiko Takenaka, Tomoo Shiomi

    POLYMER   50 ( 1 )   271 - 278   2009年1月

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    記述言語:英語   出版者・発行元:ELSEVIER SCI LTD  

    Phase behavior and structure formation in liquid crystallization of a side-chain liquid crystalline (LC) block copolymers composed of poly[11-(4'-cyanophenyl-4 ''-phenoxy)undecyl acrylate] (Pa11OCB) and polystyrene (PSt) were investigated by using a time-resolved small-angle X-ray scattering technique (SAXS), differential scanning calorimetry and polarizing optical microscopy. PA(11)OCB homopolymer formed smectic (Sm) liquid crystal. Liquid crystallization behavior of the block copolymers depended on the molecular weight and the block composition. When molecular weight was relatively low, order-disorder transition (ODT) was observed. In cooling of such block copolymers, liquid crystallization seemed to wait for the formation of LC-rich microphase by ODT. For the block copolymers with relatively high molecular weight, liquid crystallization slightly enlarged the domain spacing without changing the microphase separation structure in the melt. The order of the LC phase was lowered with decreasing dimensionality of the LC microdomains, that is, the LC blocks formed smectic liquid crystal in the matrix or lamellar microphase while liquid crystallization in the cylindrical microdomains did not show smectic but maybe nematic liquid crystal. Moreover, the LC blocks within the spherical microdomains did not liquid crystallize. From the 2-D SAXS with applying shear flow, the Sm layers were orientated perpendicularly to the interface of the microphase separation. The relation between the layer thickness of the LC phase and the molecular weight suggested that the main chain was extended normally to the interface of the microphase separation. (C) 2008 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.polymer.2008.11.003

    Web of Science

  • 官能基を有する1,3-ジエン類の重合 第7報 − イソプレンホスホン酸ジエ チルのラジカル重合

    竹中克彦, 西田敏博, 竹下宏樹, 宮 正光, 塩見友雄

    高分子論文集   66 ( 2 )   61 - 68   2009年

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  • Polymerization of 1,3-Dienes Containing Functional Groups 6: Unexpected Collapse of Monomer Structure in the Anionic Polymerization of 2-Ethoxymethyl-1,3-butadiene

    Katsuhiko Takenaka, Yusuke Akagawa, Hiroki Takeshita, Masamitsu Miya, Tomoo Shiomi

    POLYMER JOURNAL   41 ( 2 )   106 - 107   2009年

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    記述言語:英語   出版者・発行元:SOC POLYMER SCIENCE JAPAN  

    DOI: 10.1295/polymj.PJ2008212

    Web of Science

  • Polymerization of 1,3-Dienes with Functional Groups. 5. RAFT Polymerization of N,N-diethyl-2-methylene-3-butenamide

    e-Journal of Soft, Materials

    K. Takenaka, M. Matsui, H. Takeshita, M. Miya and T. Shiomi   5   1 - 8   2009年

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  • Suzuki-Miyauraカップリングを用いた側鎖に4-ビニルフェニル基を有するブチルゴムの合成

    鈴木麻純, 竹下宏樹, 宮 正光, 竹中克彦, 塩見友雄, 玉光賢次, 今田俊洋

    日本ゴム協会誌   82 ( 6 )   241 - 246   2009年

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    記述言語:日本語   出版者・発行元:THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN  

    Suzuki-Miyaura coupling reaction of brominated butyl rubber (BIIR) with 4-vinylphenylboronic acid were carried out in THF using cyclopalladated complex as catalyst. The degree of 4-vinylphenyl group introduction was estimated from the ratio of RI and UV peak area in the size exclusion chromatogram (SEC) of modified butyl rubber (St-IIR). Considerable amount of 4-vinylphenyl group could be introduced to butyl rubber in the presence of small amount (Pd/Br≈1/1000) of Pd catalyst.<br>Quantitative analysis for the degree of 4-vinylphenyl group introduction was made by <sup>1</sup>H-NMR. The <i>exo</i> methylene signals in BIIR decreased by the reaction whereas signals attributable to the viny protons of 4-vinylphenyl group increased with reaction time. When reaction was carried out in THF at reflux temperature for 12 h in the presence of 0.01 eq. of Pd catalyst, 4-vinylphenyl group was introduced quantitatively. The peroxide curing behavior of St-IIR was also examined.

    DOI: 10.2324/gomu.82.241

    CiNii Books

    その他リンク: https://jlc.jst.go.jp/DN/JALC/00333345519?from=CiNii

  • Phase behavior in liquid crystallization for diblock copolymers consisting of rubbery amorphous and side-chain liquid crystalline components

    Shin-ichi Taniguchi, Hiroki Takeshita, Mitsuo Arimoto, Masamitsu Miya, Katsuhiko Takenaka, Tomoo Shiomi

    POLYMER   49 ( 22 )   4889 - 4898   2008年10月

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    記述言語:英語   出版者・発行元:ELSEVIER SCI LTD  

    Phase behavior in liquid crystallization was studied for a series of liquid crystalline (LC) diblock copolymers consisting of rubbery amorphous and side-chain liquid crystalline components, poly(n-butyl acrylate) (PBA) andpoly[11-(4'-cyanophenyl-4 ''-phenoxy)undecyl acrylate] (PLC), respectively, using a time-resolved small-angle X-ray scattering (SAXS) techniques, DSC and polarized optical microscopy (POM). The block copolymers used had three kinds of copolymer compositions, 44, 20 and 15 wt% of PLC compositions (BLC44, BLC20 and BLC15, respectively). BLC44 showed a smectic liquid crystalline structure. In the process of liquid crystallization for BLC44, the SAXS peak due to the microphase separation structure existing before liquid crystallization was changed continuously to be at a smaller angular side, and at almost the same time, a new peak appeared at a further smaller angular side and developed. The former peak disappeared with the development of liquid crystallization. The behavior of these SAXS peaks suggests that the microphase separation structure was changed discretely at the transition from isotropic to smectic and that two phases coexist in the early stage of the liquid crystallization. The coexistence of two peaks in the early stage of the liquid crystallization corresponded to the POM observation. In the isotropization process, coexistence of two phases was not observed. For BLC20 exhibiting a cylindrical structure in both isotropic and liquid crystalline states, the liquid crystalline structure was not smectic but probably nematic, and the spacing was changed continuously in liquid crystallization. No liquid crystallization was observed in SAXS, POM and DSC for BLC15. The orientation of smectic layers within lamellar domains was investigated using 2D-SAXS images. The smectic layer was aligned perpendicularly to the lamellar interface. (C) 2008 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.polymer.2008.08.060

    Web of Science

  • Structure Formation and Crystallization Behavior of Ethylene-Isoprene Block Copolymers and Their Blends with Corresponding Homopolymers

    Y. -J. Gao, H. Takeshita, Y. Takata, K. Takenaka, T. Shiomi

    e-Journal of Soft Materials   4   12 - 22   2008年

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    記述言語:英語   出版者・発行元:THE SOCIETY OF RUBBER SCIENCE AND TECHNOLOGY, JAPAN  

    Time-resolved simultaneous synchrotron small-angle X-ray scattering and differential scanning calorimetry experiments have been performed on crystallization of polyethylene-polyisoprene diblock copolymers (HEI or LEI) and their blends with corresponding homopolymers, polyethylene (PE) and polyisoprene (PIp). For the neat block copolymer having a 50 wt% of the crystalline component, preexisting microphase separation structure in the melt was kept at high and low crystallization temperatures <i>T</i><sub>c</sub> (<i>T</i><sub>c</sub>≥94°C and <i>T</i><sub>c</sub><60°C), while disrupted at intermediate <i>T</i><sub>c</sub> (60°C≤<i>T</i><sub>c</sub><94°C). This complex behavior was interpreted by combination of two mechanisms. The behavior in the crystallization below 94°C was attributed to the competition between the crystallization and chain diffusion rates, that is, the fast crystallization rate at lower <i>T</i><sub>c</sub> makes it difficult to rearrange the phase structure in the melt. On the other hand, at a higher <i>T</i><sub>c</sub> (≥94°C), the preservation of the microphase separation structure was explained by a small degree of crystallinity due to the ethyl branch of polyethylene (hydrogenated poly(butadiene)). For HEI/PE blends, crystallization behavior was the simple superposition of those for HEI and PE, while, for HEI/PIp with a small composition of PE, suppression of crystallinity was observed. Crystallization kinetics in the neat block copolymer and all the blends was not so different from that in the PE homopolymer.

    DOI: 10.2324/ejsm.4.12

  • Polymerization of 1,3-Dienes with Functional Groups. 4. Anionic Polymerization of N,N-diethyl-2-methylene-3-butenamide

    K. Takenaka, N. Shibata, S. Tsuchida, H. Takeshita, M. Miya, T. Shiomi

    e-Journal of Soft Materials   4   23 - 29   2008年

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    記述言語:英語   出版者・発行元:THE SOCIETY OF RUBBER SCIENCE AND TECHNOLOGY, JAPAN  

    Anionic polymerization of <i>N</i>,<i>N</i>-diethyl-2-methylene-3-butenamide (DEA), which is a 1,3-butadiene derivative containing a diethylamide function, was carried out in tetrahydrofurane (THF) under various conditions. When DEA was polymerized in THF at −78°C using potassium naphthalenide (K-Naph) or diphenylmethylpotassium (DPMK) as an initiator, a polymer of predictable molecular weight with a narrow molecular weight distribution was obtained. However, the rate of polymerization was extremely slow to reach 80% conversion after 720 h. When the polymerization temperature was raised to 20°C, a low molecular weight oligomer with a broad molecular weight distribution was obtained because of a chain transfer reaction. On the other hand, no such side reaction occurred even at 20°C, when polymerization was carried out in the presence of LiCl. Also, the chain transfer reaction did not occur in lithium naphthalenide (Li-Naph) initiated polymerization. The microstructure of the polymer prepared using a potassium counter cation was a 1 : 1 mixture of 1,4-<i>E</i> and 1,2- structures. In the case of Li-Naph or DPMK/LiCl systems, the microstructure was a complicated mixture of 1,4-<i>E</i>, 1,4-<i>Z</i>, and 1,2-structures.

    DOI: 10.2324/ejsm.4.23

  • 高分子多成分系における結晶化と高次構造 招待

    塩見友雄, 竹下宏樹

    繊維と工業   2007年12月

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    記述言語:日本語   掲載種別:速報,短報,研究ノート等(学術雑誌)   参加形態:共同(主担当)  

  • Formation of phase structure and crystallization behavior in blends containing polystyrene-polyethylene block copolymers

    Hiroki Takeshita, Yuan-Ji Gao, Tomoyuki Natsui, Erick Rodriguez, Masamitsu Miya, Katsuhiko Takenaka, Tomoo Shiomi

    POLYMER   48 ( 26 )   7660 - 7671   2007年12月

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    記述言語:英語   出版者・発行元:ELSEVIER SCI LTD  

    The microphase separation structure in the molten state and the structure formation in crystallization from such ordered melt were investigated for the blends of polystyrene-polyethylene block copolymers (SE) with polystyrene homopolymer (PS) and polyethylene homopolymer (PE) and for the blends consisting of two kinds of SE with different copolymer compositions from each other, using synchrotron small-angle X-ray scattering techniques (SAXS). The copolymer compositions of SE block copolymers employed were 0.34, 0.58 and 0.73 wt. fraction of PE, and their melt morphologies were cylindrical, lamellar and lamellar, respectively. Macrophase separation or the morphology change in the melt occurred depending on the molecular weight and the blend composition, as reported so far. In crystallization from such macrophase-separated and microphase-separated melts, the melt morphology was completely kept for all the blends. Crystallization behavior was also investigated for the blends. The crystallization within the spherical and cylindrical domains surrounded by glassy PS was not observed for SE/PS blends. In the crystallization from the macrophase-separated melt, two exothermal peaks were observed in the DSC measurements, while a single peak was observed for other blends. For the blends with PS, the degree of crystallinity was depressed and the apparent activation energy of crystallization was high, compared to those for the corresponding neat SE. For SE/PE and SE/SE blends, those were changed depending on the blend composition. (C) 2007 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.polymer.2007.11.002

    Web of Science

  • Formation of lamellar structure by competition in crystallization of both components for crystalline-crystalline block copolymers

    Hiroki Takeshita, Katsuhiko Fukumoto, Takeshi Ohnishi, Takayuki Ohkubo, Masamitsu Miya, Katsuhiko Takenaka, Tomoo Shiomi

    POLYMER   47 ( 24 )   8210 - 8218   2006年11月

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    記述言語:英語   出版者・発行元:ELSEVIER SCI LTD  

    Crystallization and structure formation of poly(ethylene oxide)-poly(epsilon-caprolactone) block copolymers (PEG-PCL) in which the melting temperatures of the components are close to each other were elucidated using differential scanning calorimetry (DSC), small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) techniques. The diblock copolymers with 33, 46 and 59 wt% of PEG composition formed ordinary single spherulites similar to those of PCL homopolymers, while concentric double-circled spherulites appeared for the PCL-PEG-PCL triblock copolymer with 66 wt% PEG composition as observed previously. For the diblock copolymers, despite of the ordinary appearance of the single spherulites, the DSC thermograms and the WARD patterns indicated the crystallization of PEG as well as PCL. The time-resolved SAXS profiles for the diblock copolymers showed that long spacings of the crystal lamellae decreased stepwise in the crystallization process. Synthesizing these results for the single spherulites, it was concluded that PCL crystallized first followed by the crystallization of PEG with preservation of the PCL crystal lamellar structure. This means that PEG must crystallize within confined space between the formerly formed PCL crystal lamellae. Such confined crystallization of PEG caused the suppressed melting temperature, crystallinity and crystallization rate especially in the smaller PEG compositions. In the melting process of the diblock copolymers, it was observed that the PEG component first melted with a stepwise increase in the long spacing. (c) 2006 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.polymer.2006.09.043

    Web of Science

  • Miscibility in blends of linear and branched poly(ethylene oxide) with methacrylate derivative random copolymers and estimation of segmental chi parameters

    H Takeshita, T Shiomi, T Suzuki, T Sato, M Miya, K Takenaka, S Wacharawichanant, S Damirongsakkul, S Rimdusit, S Thongyai, Taepaisitphongse, V

    POLYMER   46 ( 25 )   11463 - 11469   2005年11月

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    記述言語:英語   出版者・発行元:ELSEVIER SCI LTD  

    Miscibility in the blends of poly(ethylene oxide) (PEO) with n-hexyl methacrylate-methyl methacrylate random copolymers (HMA-MMA) and 2-ethylhexyl methacrylate-MMA random copolymers (EHMA-MMA) Was evaluated using glass transition and light scattering methods. EHMA-MMA was more miscible with PEO than HMA-MMA. Both blends of PEO with HMA-MMA and EHMA-MMA showed UCST-type miscibility although homopolymer blends PEO/PMMA were predicted to be of LCST-type. This was attributed to an increase in the exchange enthalpy with increasing HMA or EHMA composition in the random copolymer. From the copolymer composition dependence of miscibility the segmental x parameters of HMA/MMA, EHMA/MMA, EO/HMA and EO/EHMA were estimated using the Flory-Huggins theory extended to random copolymer systems. Miscibility in the blends of branched PEO with HMA-MMA whose HMA copolymer composition was 0.16 was compared with that in the linear PEO blends. The former blends were more miscible with HMA-MMA than the latter one by about 35 degrees C at the Maximum Cloud point temperature. (c) 2005 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.polymer.2005.10.067

    Web of Science

  • ブロック共重合体のミクロ相分離下からの結晶化挙動と相構造形成 招待

    塩見友雄, 竹下宏樹

    繊維と工業   2005年1月

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    記述言語:日本語   掲載種別:速報,短報,研究ノート等(学術雑誌)   参加形態:共同(主担当)  

  • Crystallization and structure formation of block copolymers containing a glassy amophous component

    H Takeshita, N Ishii, C Araki, M Miya, K Takenaka, T Shiomi

    JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS   42 ( 22 )   4199 - 4206   2004年11月

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    記述言語:英語   出版者・発行元:JOHN WILEY & SONS INC  

    Formation of higher-order structure in crystallization from microphase-separated melts was studied for polystyrene-polyethylene (PS-PE) diblock copolymers and PS-PE-PS triblock copolymers with time-resolved synchrotron small-angle X-ray scattering (SR-SAXS) techniques. The PE block was crystallized at temperatures when the PS block was in the glassy state. In both crystallization and melting processes, only the peak intensity in the SR-SAXS curve changed, however, the peak positions including higher-order peaks did not change. This means that the microphase-structure in the crystalline state was completely the same as that in the molten state. These behaviors were observed regardless of any melt microphase structure. Also, once a stable microphase structure was formed in the molten state, the structure was not changed even if crystallization and melting were repeated. Behavior of crystallization from such microphase-separated melts was also studied. Apparent activation energies of crystallization were high for all block copolymers, compared with that for the PE homopolymer. In particular, the triblock copolymers showed higher apparent activation energies than the diblock copolymers. Both degrees of crystallinity and Avrami indices were greatly suppressed in crystallization from the cylindrical domain. (C) 2004 Wiley Periodicals, Inc.

    DOI: 10.1002/polb.20278

    Web of Science

  • Polymerization of 1,3-dienes with functional groups. III. Free-radical polymerization of N,N-diethyl-2-methylene-3-butenamide

    T Yaegashi, S Yodoya, M Nakamura, H Takeshita, K Takenaka, T Shiomi

    JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY   42 ( 4 )   999 - 1007   2004年2月

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    記述言語:英語   出版者・発行元:JOHN WILEY & SONS INC  

    Free-radical homo- and copolymerization behavior of N,N-diethyl-2-methylene-3-butenamide (DEA) was investigated. When the monomer was heated in bulk at 60 degreesC for 25 h without initiator, rubbery, solid gel was formed by the thermal polymerization. No such reaction was observed when the polymerization was carried out in 2 mol/L of benzene solution with with I mol % of azobisisobutyronitrile (AIBN) as an initiator. The polymerization rate (R-P) equation was R-P proportional to [DEA](1.1)[AIBN](0.5), and the overall activation energy of polymerization was calculated 84.1 kJ/mol. The microstructure of the resulting polymer was exclusively a 1,4-structure where both 1,4-E and 1,4-Z structures were included. From the product analysis of the telomerization with tertbutylmercaptan as a telogen, the modes of monomer addition were estimated to be both 1,4- and 4,1-addition. The copolymerizations of this monomer with styrene and/or chloroprene as comonomers were also carried out in benzene solution at 60 degreesC. In the copolymerization with styrene, the monomer reactivity ratios obtained were r(1) = 5.83 and r(2) = 0.05, and the Q and e values were Q = 8.4 and e = 0.33, respectively. (C) 2004 Wiley Periodicals, Inc.

    DOI: 10.1002/pola.11051

    Web of Science

  • Polymerization of 1,3-dienes with functional groups. II. Free-radical polymerization of N-(2-methylene-3-butenoyl)piperidine

    T Yaegashi, H Takeshita, K Takenaka, T Shiomi

    JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY   41 ( 10 )   1545 - 1552   2003年5月

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    記述言語:英語   出版者・発行元:JOHN WILEY & SONS INC  

    The free-radical homopolymerization and copolymerization behavior of N-(2-methylene-3-butenoyl)piperidine was investigated. When the monomer was heated in bulk at 60 degreesC for 25 h without an initiator, about 30% of the monomer was consumed by the thermal polymerization and the Diels-Alder reaction. No such side reaction was observed when the polymerization was carried out in a benzene solution with 1 mol % 2,2'-azobisisobutylonitrile (AIBN) as an initiator. The polymerization rate equation was found to be R-p proportional to [AIBN](0.507)[M](1.04), and the overall activation energy of polymerization was calculated to be 89.5 kJ/mol. The microstructure of the resulting polymer was exclusively a 1,4-structure that included both 1,4-E and 1,4-Z configurations. The copolymerizations of this monomer with styrene and/or chloroprene as comonomers were carried out in benzene solutions at 60 degreesC with AIBN as an initiator. In the copolymerization with styrene, the monomer reactivity ratios were r(1) = 6.10 and r(2) = 0.03, and the Q and e values were calculated to be 10.8 and 0.45, respectively. (C) 2003 Wiley Periodicals.

    DOI: 10.1002/pola.10675

    Web of Science

  • Synthesis of modified styrene-butadiene rubber latex containing triethoxysilyl group and its in situ silica filling.

    Sunada, Kiyoshi, Takeshita, Hiroki, Miya, Masamitsu, Nakamura, Tsukasa, Takenaka, Katsuhiko, Shiomi, Tomoo

    Nippon Gomu Kyokaishi   76 ( 7 )   234 - 239   2003年

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    記述言語:日本語   出版者・発行元:THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN  

    Triethoxysilyl modified styrene-butadiene rubber latex was synthesized by the emulsion copolymerization of 2-(3-triethoxysilylpropyl)-1, 3-butadiene with styrene and 1, 3-butadiene. This latex was mixed with unmodified SBR latex and tetraethoxysilane to obtain SBR-silica composites by sol-gel reaction in the latex. Evaluation of mechanical properties demonstrated that tensile modulus and tensile strength, elongation at break improved with increasing of the amount of modified SBR. SEM observation for SBR-silica composites suggested that particle size of silica dispersed in unvulcanized rubber matrix grew larger with decreasing of silica content.

    DOI: 10.2324/gomu.76.234

    CiNii Books

    その他リンク: https://jlc.jst.go.jp/DN/JALC/00229827310?from=CiNii

  • Crystallization and structure formation of block copolymers containing a rubbery amorphous component

    T Shiomi, H Takeshita, H Kawaguchi, M Nagai, K Takenaka, M Miya

    MACROMOLECULES   35 ( 21 )   8056 - 8065   2002年10月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    Changes of higher-order structure of poly(ethylene glycol) - poly(butadione) (PEG-PBd) di- and triblock copolymers in isothermal crystallization from microphase-separated melts were studied using time-resolved synchrotron small-angle X-ray scattering (SR-SAXS) techniques. Lamellar microphase structure of PEG-PBd with weight fractions fl'EG = 0.57 and 0.51 was destroyed on crystallization and changed to a lamellar structure distinct from that in the melt. A diblock copolymer with f(PEG) = 0.34 crystallized, keeping the cylindrical structure preexisting in the melt. On the other hand, a f(PEG) = 0.7 diblock copolymer whose melt structure was cylindrical showed two kinds of structure changes: at low crystallization temperatures T, the SAXS peak positions changed discontinuously but the structure remained cylindrical, while the structure changed from cylindrical to lamellar at high T,. Triblock copolymers PBd-PEG-PBd with f(PEG) = 0.67 and 0.42 showed a structure change similar to the f(PEG) = 0.57 and 0.51 diblock copolymers. Behavior of structure changes in the melting process was the reverse of that in the crystallization process for all the samples. Crystallization behavior, in particular crystallization kinetics, was also investigated by DSC and polarized optical microscopy (POM.) with a 530 nm retardation plate. Avrami exponents evaluated from DSC results for the block copolymers were almost the same as those for PEG homopolymers even in crystallization from the cylindrical melt, which was quite different from the result in crystallization from a frozen microphase-separated melt reported previously. For the f(PEG) = 0.34 diblock and f(PEG) = 0.42 triblock copolymers with a small-sized microdomain in the melt, overall crystallization rates were suppressed and apparent activation energies were high. No spherulite with a clear Maltese cross was observed by POM, but the crystal region was propagated with irregularly distributed blue- and yellow-colored portions for all the block copolymers including the f(PEG) = 0.34 diblock copolymers. This behavior of the propagation and the above result of Avrami exponents for the f(PEG) = 0.34 copolymer suggest that crystallization can traverse from one cylinder domain to another with preservation of the melt structure. From the kinetic results obtained by both DSC and POM, it was suggested that nucleation was easy for the middle block in the triblock copolymers.

    DOI: 10.1021/ma0200118

    Web of Science

  • ブロック共重合体の結晶化挙動と高次構造形成 招待

    塩見友雄, 竹下宏樹

    高分子   2002年9月

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    記述言語:日本語   掲載種別:速報,短報,研究ノート等(学術雑誌)   参加形態:共同(主担当)  

  • ブロック共重合体の結晶化と高次構造形成 招待

    塩見友雄, 竹下宏樹

    日本接着学会誌   2002年2月

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    記述言語:日本語   掲載種別:速報,短報,研究ノート等(学術雑誌)   参加形態:共同(主担当)  

  • 多相系高分子の結晶化と高次構造形成 招待

    塩見友雄, 竹下宏樹

    高分子加工   2002年1月

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    記述言語:日本語   掲載種別:速報,短報,研究ノート等(学術雑誌)   参加形態:共同(主担当)  

  • Small-angle Neutron Scattering Studies on Network Structure of Transparent and Opaque PVA Gels

    Physica B   311, 78-83   2002年

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  • Crystallization process in binary blends of poly(epsilon-caprolactone)-block-polybutadiene copolymers

    S Tanimoto, K Ito, S Sasaki, H Takeshita, S Nojima

    POLYMER JOURNAL   34 ( 8 )   593 - 600   2002年

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    記述言語:英語   出版者・発行元:SOC POLYMER SCIENCE JAPAN  

    The crystallization process in binary blends of poly(epsilon-caprolactone)-block-polybutadiene (PCL-b-PB) copolymers has been investigated by time-resolved small-angle X-Ray scattering with synchrotron radiation (SR-SAXS), where the crystallization of PCL blocks induces a morphological transition both in neat copolymers but the crystallization rate is extremely different between them. The microdomain structure in the melt and the final morphology after crystallization were also measured by conventional SAXS, and the melting behavior of crystallized samples was observed by differential scanning calorimetry (DSC). The binary blend forms a single microdomain structure in the melt over the whole composition range investigated, and the crystallization proceeds with an intermediate rate between those of the constituent PCL-b-PB copolymers to result in a single lamellar morphology. The time dependence of SR-SAXS curves is qualitatively similar in features to that for the crystallization of pure PCL-b-PB copolymers, suggesting that the crystallization of the blend is substantially controlled by a single crystallization mechanism. The remarkable change in the crystallization rate with composition is ascribed to the difference in the stability of preexisting microdomain structures. The conformation of (longer and shorter) PB blocks in the final lamellar morphology is qualitatively discussed.

    DOI: 10.1295/polymj.34.593

    Web of Science

  • Spinodal decomposition and syneresis of PVA gel

    H Takeshita, T Kanaya, K Nishida, K Kaji

    MACROMOLECULES   34 ( 22 )   7894 - 7898   2001年10月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    The phase separation of a network in the unstable region has been investigated using a homogeneous transparent poly(vinyl alcohol) (PVA) gel by volume and UV transmittance measurements as well as by time-resolved light scattering measurements. It was found that the light scattering intensity I(Q) shows a single peak which increases in intensity exponentially with time without shifting the peak position in the early stage of phase separation, suggesting that a spinodal decomposition (SD) type phase separation occurs in this system. In contrast to the usual fluids, the domain growth is extremely slowed down in the late stage because the elastic force of the gel suppresses the surface tension force, which is the driving force of domain growth. This is the so-called pinning effect. As the SD approaches the end, the UV transmittance of the gel increases gradually and the scattering intensity decreases during the shrinking process of volume (syneresis), which corresponds to a relaxation process of the microscopic internal fluctuations produced in the SD process.

    DOI: 10.1021/ma010539x

    Web of Science

  • Crystallization of semicrystalline block copolymers containing a glassy amorphous component

    T Shiomi, H Tsukada, H Takeshita, K Takenaka, Y Tezuka

    POLYMER   42 ( 11 )   4997 - 5004   2001年5月

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    記述言語:英語   出版者・発行元:ELSEVIER SCI LTD  

    The effect of the microphase separation structure in the melt on crystallizability and crystallization kinetics was studied for poly(tetrahydrofuran)-polystyrene diblock copolymers (PTHF-PS) which has a glassy amorphous component. Four binds of copolymers, Block I, Block 2, Block 3 and Block 4 with PTHF compositions of 59, 51, 38 and 29 vol%, respectively, were employed and their crystallization behavior was compared with the PTHF/PS blends as well as the PTHF homopolymers. Crystallization of Block 2, Block 3 and Block 4 was much suppressed, in particular no crystallization was detected for Block 4 even in a long crystallization time and at a high supercooling degree. The blends of Block 4 with the PTHF homopolymer also did not crystallize in the total PTHF content less than about 40%. It was concluded from these results that crystallization from the semidiscontinuous microdomain such as lamellar and cylindrical ones was much suppressed and that crystallization did not occur inside the discontinuous or spherical microdomain surrounded by the glassy matrix. The Avrami exponent was extremely small for Block 2 and Block 3, which suggested that their crystallization occurred under a high spatial constraint. The linear overall rate constant of crystallization for Block 1 was smaller than the blends and homopolymers, but the apparent activation energy of crystallization of Block I was not so different from that of the blends and homopolymers. For Block 2 and Block 3, on the other hand, the rate constant was small and the apparent activation energy was much high. The interfacial free energy of Block 2 and Block 3 estimated using the Lauritzen-Hoffman theory was also large. (C) 2001 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0032-3861(00)00894-6

    Web of Science

  • Appearance of double spherulites like concentric circles for poly(epsilon-caprolactone)-block-poly(ethylene glycol)-block-poly(epsilon-caprolactone)

    T Shiomi, K Imai, K Takenaka, H Takeshita, H Hayashi, Y Tezuka

    POLYMER   42 ( 7 )   3233 - 3239   2001年3月

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    記述言語:英語   出版者・発行元:ELSEVIER SCI LTD  

    A unique morphology of spherulites, namely double spherulites like concentric circles, was observed for poly(epsilon -caprolactone)-block-poly(ethylene glycol)-block-poly(epsilon -caprolactone) (PCL-b-PEG-b-PCL) triblock copolymers, ABA-2 and ABA-3, with PCL compositions of 66 and 60 wt%, respectively. The central and outer sections in the concentric spherulites were those of PCL and PEG, respectively. In formation of the concentric spherulites, the spherulites of the PCL component always appeared first and grew, and then the PEG spherulite developed from the growth front of the PCL spherulite, Any nucleation of the PEG spherulite prior to that of PCL was not observed. In the triblock copolymers, ABA-1 and ABA-4, with PCL compositions of 83 and 34 wt%, respectively, no concentric spherulites were observed but usual single-circle spherulites were formed; only PCL spherulites were formed for ABA-l while for ABA-4 only PEG spherulites were observed. For ABA-2 and ABA-3 having the concentric spherulites, two melting peaks appeared and the WAXD patterns were a superposition of those for the PEG and PCL homopolymers. The SAXS curves for ABA-2 and ABA-3 also had two kinds of peaks due to the long spacings relative to the PCL and PEG crystal lamellae, respectively. The values of the long spacing estimated from the peak positions suggested that the PEG (or PCL) segments located between the crystal lamellae of PCL (or PEG) existed as amorphous segments. (C) 2001 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0032-3861(00)00597-8

    Web of Science

  • Ultra-small-angle neutron scattering studies on phase separation of poly(vinyl alcohol) gels

    Takeshita, H, Kanaya, T, Nishida, K, Kaji, K, Takahashi, T, Hashimoto, M

    Physical Review E: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics   61 ( 2 )   2125 - 2128   2000年

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  • elation process and phase separation of PVA solutions as studied by a light scattering technique

    Takeshita, H, Kanaya, T, Nishida, K, Kaji, K

    Macromolecules   32 ( 23 )   7815 - 7819   1999年

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  • Micro- and mesoscopic structure of poly(vinyl alcohol) gels determined by neutron and light scattering

    T Kanaya, H Takeshita, Y Nishikoji, M Ohkura, K Nishida, K Kaji

    SUPRAMOLECULAR SCIENCE   5 ( 3-4 )   215 - 221   1998年7月

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    記述言語:英語   出版者・発行元:ELSEVIER SCI LTD  

    We studied the structure of poly(vinyl alcohol) (PVA) gels formed in mixtures of dimethyl sulfoxide (DMSO) and water using several scattering techniques such as wide-angle neutron scattering (WANS), small-angle neutron scattering (SANS), ultra-small-angle neutron scattering (U-SANS) and light scattering (LS) to cover a very wide Q range from 10(-4) to 10 Angstrom(-1). The WANS measurements have revealed that the cross-linking points of the gels are crystallites, and the size and its distribution have been evaluated by the SANS measurements. The SANS results have also shown that the structure observed in the low Q range below 10(-2) Angstrom(-1) is dominated by a liquid-liquid-phase separation. The early stage of the phase separation has been studied in detail using the time-resolved LS technique, while the late stage has been investigated by the U-SANS technique because the LS measurements cannot access the opaque samples. On the basis of the results, we present a quantitative sketch of the structure of the PVA gel. (C) 1998 Elsevier Science Limited. All rights reserved.

    DOI: 10.1016/S0968-5677(98)00009-1

    Web of Science

  • Hierarchic structure of poly(vinyl alcohol) gels

    H Takeshita, T Kanaya, K Kaji, K Nishida, Y Nishikoji, M Ohkura

    KOBUNSHI RONBUNSHU   55 ( 10 )   595 - 602   1998年

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    記述言語:日本語   出版者・発行元:SOC POLYMER SCIENCE JAPAN  

    The structure of poly(vinyl alcohol) (PVA) gels formed in mixtures of dimethyl sulfoxide (DMSO) and water was studied using several scattering techniques such as wide-angle neutron scattering (WANS), small-angle neutron scattering (SANS), ultra-small angle neutron scattering (U-SANS), and light scattering (LS), covering a very wide Q range from 10(-4) to 10 Angstrom(-1). The WANS measurements have revealed that the cross-linking points of the gels are crystallites, and the spatial distribution has been evaluated by SANS measurements. The SANS results have also shown that the structure observed in a low Q range below 10(-2) Angstrom(-1) is dominated by a liquid-liquid phase separation. The early stage of the phase separation has been studied in more detail using a time-resolved LS technique, while the late stage has been investigated by a U-SANS technique because the LS technique cannot be applied to opaque samples. On the basis of the results, we have proposed a schematic model for the structure of PVA gels.

    DOI: 10.1295/koron.55.595

    Web of Science

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  • 側鎖型液晶性共重合体の相構造おに関する研究

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  • ポリビニルアルコールゲルの構造に関する研究

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  • Structure and properties of multi-component polymeric systems

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    資金種別:競争的資金

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  • ガンマ線照射によるポリプロピレンの改質技術の研究

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    第31回高分子加工技術討論会  2019年10月 

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  • ポリシランを添加したポリオレフィンの劣化挙動に関する研究

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    第31回高分子加工技術討論会  2019年10月 

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    第67回レオロジー討論会  2019年10月 

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  • ブロック共重合体の液晶化による主鎖および側鎖の形態変化

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    第67回レオロジー討論会  2019年10月 

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    記述言語:日本語   会議種別:ポスター発表  

  • 非晶性高分子の熱履歴による力学物性および構造変化

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    第67回レオロジー討論会  2019年10月 

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    記述言語:日本語   会議種別:ポスター発表  

  • 環状分子を含むポリオキシメチレンの結晶化と構造の解析

    西村暢哉、竹下 宏樹、徳満 勝久

    第67回レオロジー討論会  2019年10月 

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    記述言語:日本語   会議種別:ポスター発表  

  • ガンマ線照射によるポリプロピレンの改質技術研究

    金谷敦史、竹下宏樹、松本敦、廣庭隆行、徳満勝久

    第67回レオロジー討論会  2019年10月 

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    記述言語:日本語   会議種別:ポスター発表  

  • ETFE/BVOH系ブレンド材料の力学物性,水素耐性に関する研究

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    第67回レオロジー討論会  2019年10月 

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    第68回高分子討論会  2019年9月 

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  • ポリオキシメチレンの結晶化における環状分子の効果

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  • 放射光SAXSによるナノサイズ相空間内における液晶相転移と配向挙動 招待

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    第60回放射線化学討論会  2017年9月 

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    開催地:つくば  

  • Structure Formation in Crystallization of Block Copolymers with Polyethylene as a Crystalline Component 招待 国際会議

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    12th IUPAC International Conference on Novel Materials and their Synthesis  2016年10月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

  • Crystallization behavior of block copolymers containing polyethylene as a crystalline component 招待 国際会議

    H. Takeshita

    World Polyolefin Congress 2015  2015年11月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

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    第63回高分子学会年次大会  2014年5月 

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  • Colloidal Crystallization Kinetics of Aqueous Dispersion of Temperature-responsive Polymer Microgels 国際会議

    H. Takeshita, S. Kakefuda, K. Kimura, M. Miya, K. Takenaka, T. Shiomi

    1st International Symposium on Nanoparticles/Nanomaterials and Applications  2014年1月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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    第25エラストマー討論会  2013年12月 

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  • Crystallization and Structure Formation of Multicomponent Polymer Systems 国際会議

    T. Shiomi, H. Takeshita, K. Takenaka, F. Arai

    第10回中日先進高分子材料討論会  2013年11月 

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  • ポリ(N-イソプロピルアクリルアミド)マイクロゲル分散系の相転移挙動

    掛札さくら、宮正光、竹下宏樹、竹中克彦、塩見友雄

    第62回北陸支部研究発表会  2013年11月 

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    第62回北陸支部研究発表会  2013年11月 

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  • 一酸化炭素を鍵物質とした新規ポリエステルの合成

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    第62回北陸支部研究発表会  2013年11月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  • 2,3-ジメチレンブタン-1,4-ジイルホスホン酸テトラメチルの合成とラジカル重合

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    第62回北陸支部研究発表会  2013年11月 

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  • 光応答性成分を含む液晶性-液晶性ブロック共重合体の相挙動

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    第62回北陸支部研究発表会  2013年11月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  • Colloidal Crystallization of Aqueous Dispersion of Thermoresponsive Polymer Microgels 国際会議

    S. Kakefuda, H. Takeshita, M. Miya, K. Takenaka and T. Shiomi

    Joint Research Seminar USM-NUT  2013年10月 

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    記述言語:英語   会議種別:口頭発表(一般)  

  • Anionic Polymerization of 3-phenyl[3]dendralene, a new class of conjugated monomer 国際会議

    K. Takenaka, H. Takeshita, M. Miya and T. Shiomi

    USM-NUT Mini Symposium  2013年10月 

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    記述言語:英語   会議種別:口頭発表(一般)  

  • Structure Formation in Liquid Crystalline Block Copolymers as Revealed by Synchrotron Radiation Small-Angle X-ray Scattering 国際会議

    H. Takeshita, R. Kudo, M. Miya, K. Takenaka and T. Shiomi

    USM-NUT Mini Symposium  2013年10月 

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    記述言語:英語   会議種別:口頭発表(一般)  

  • Photoresponsive Liquid Crystalline Block Copolymers Containing Azobenzene Moieties in the SIde Chain 国際会議

    T. Okazawa, Y. Yamazaki, H. Takeshita, M. Miya, K. Takenaka and T. Shiomi

    Joint Research Seminar USM-NUT  2013年10月 

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    記述言語:英語   会議種別:口頭発表(一般)  

  • ポリ(N-イソプロピルアクリルアミド)マイクロゲル分散系の相転移挙動

    掛札 さくら、竹下 宏樹、宮 正光、竹中 克彦、塩見 友雄

    第62回高分子討論会  2013年9月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  • 光応答性成分を含む液晶性-液晶性ブロック共重合体の相挙動

    岡澤 尭之、山崎 祐吾、竹下 宏樹、宮 正光、竹中 克彦、塩見 友雄

    第62回高分子討論会  2013年9月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  • Photoresponse of Microphase Separation of Liquid Crystalline Block Copolymers 国際会議

    T. Okazawa, H. Takeshita, R. Kudo, K. Haginoya, M. Miya, K. Takenaka and T. Shiomi

    The 2nd International GIGAKU Conference in Nagaoka (2nd IGCN)  2013年6月 

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    記述言語:英語   会議種別:口頭発表(一般)  

  • Colloidal Crystallization of Thermosensitive Polymer Microgels 国際会議

    S. Kakefuda, H. Takeshita, K. Kimura, M. Miya, K. Takenaka and T. Shiomi

    The 2nd International GIGAKU Conference in Nagaoka (2nd IGCN)  2013年6月 

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    記述言語:英語   会議種別:口頭発表(一般)  

  • UV-response of Microphase Separation of Block Copolymers Having Azobenzene-type Liquid Crystalline Mesogens 国際会議

    H. Takeshita, R. Kudo, T. Fujise, K. Haginoya, M. Miya, K. Takenaka and T. Shiomi

    European Polymer Congress 2013  2013年6月 

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    記述言語:英語   会議種別:口頭発表(一般)  

  • 光応答性メソゲン基を有する液晶性ブロック共重合体のミクロ相分離構造

    竹下 宏樹、工藤 良介、宮 正光、竹中 克彦、塩見 友雄

    第62回高分子学会年次大会  2013年5月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  • 高分子ブレンドの結晶化と液‐液相分離による相構造形成

    新井 史紀、篠原 和也、竹下 宏樹、宮 正光、竹中 克彦、塩見 友雄

    第62回高分子学会年次大会  2013年5月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  • 二つのジアルキルホスホン酸エステル基を有するブタジエン誘導体のラジカル共重合

    小林 靖明、宮 正光、竹下 宏樹、竹中 克彦、塩見 友雄

    第62回高分子学会年次大会  2013年5月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  • 2-(4-(N-イソプロピルイミノ)フェニル)-1,3-ブタジエンのアニオン重合

    荒井 大地、宮 正光、竹下 宏樹、竹中 克彦、塩見 友雄

    第62回高分子学会年次大会  2013年5月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

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