Faculty Profiles - TOKUMITSU Katsuhisa

Papers - TOKUMITSU Katsuhisa

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

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 2022.1

Language：English Publishing type：Research paper (scientific journal) Publisher：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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Effects of Copolymer Composition on Phase Transition Behavior and Mobility of Mesogenic Group for Side-Chain Liquid Crystalline-Amorphous Random Copolymers Reviewed

Takeshita H., Kanazawa A., Tokumitsu K.

Nihon Reoroji Gakkaishi 50 ( 2 ) 189 - 195 2022.1

Language：English Publishing type：Research paper (scientific journal) Publisher：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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The relationship between the change in dynamic viscoelasticity by heat treatment and heat resistance in polystyrene moldings Reviewed

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

Zairyo/Journal of the Society of Materials Science, Japan 70 ( 1 ) 11 - 16 2021.1

Language：English Publishing type：Research paper (scientific journal) Publisher：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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A study on Photo- and Thermal- degradation of Polyethylene in addition of Polysilane Invited Reviewed

Hideya Suzuki / Hiroki Takeshita / Katsuhisa Tokumitsu

Seikei-Kakou 32 ( 12 ) 428 - 433 2020.7

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of the Japan Society of Polymer Processing Participation form：Joint(The main charge)

In this study, photo-and thermal-degradation behaviors of high density polyethylene (HDPE) with/without polymethylphenylsilane (PMPS) were investigated. There is a tendency that the modulus of HDPE with/without PMPS exposed to UV irradiation increased with exposure time, although the elongation at break decreased with exposure time. In particular, the ductile-brittle transition occurs earlier by the addition of PMPS. This result suggests that PMPS can accelerate photo-degradation of HDPE. As for the thermal-degradation, the oxidation induction time (OIT) of HDPE with PMPS is also shorter than that of neat one. Moreover, the activation energy of the oxidation of HDPE decreased with the PMPS content, indicating that PMPS also accelerates the thermal-degradation. Although the mechanism to accelerate the photo-and thermal-degradation of HDPE has not been cleared yet, it can be deduced that the pro-oxidant process caused by accelerating autoxidation with silyl radical generated by PMPS during UV irradiation and/or heattreatment occurred in HDPE.

DOI： 10.4325/seikeikakou.32.428

フルオレン修飾セルロースナノファイバーにより補強したポリアミドの特性評価 Reviewed

杉本雅行，山田昌宏，荘所大策，佐藤嘉計，徳満勝久

成形加工学会誌 32 ( 2 ) 63 - 67 2020.2

Reinforcement of Polyamide 6/66 with 9,9-bis(aryl)fluorene-Modified Cellulose Nanofiber Reviewed

Masayuki Sugimoto, Masahiro Yamada, Hirokazu Sato, and Katsuhisa Tokumitsu

Polymer Journal 2019.8

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 Reviewed

梅本叡史，徳満勝久，竹下宏樹，竹内大介，小坂田耕太郎

材料 68 ( 1 ) 47 - 53 2019.1

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 Reviewed

澁谷光夫，徳満勝久，竹下宏樹，住野翔郷，西村伸，藤原広匡

材料 68 ( 1 ) 34 - 41 2019.1

熱融着法による籾殻活性炭複合材料の物性評価研究 Reviewed

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 2018.10

The effect of Interfacial Polysilane Coating on Heat Fusion Properties of Polypropylene Reviewed

Katsuhisa Tokumitsu, Asuka Hayashi, Sakiko Fukunishi, Kazuhumi Kohno, Masami Okamoto

日本レオロジー学会誌 46 ( 3 ) 123 - 130 2018.6

Crystallization Behavior of Polyvinyl Alcohol with 1,2-Diol Side-Chains Reviewed International journal

M. Shibutani, T. Yamamoto, K. Inoue, K. Tokumitsu

International Polymer Processing 33 ( 2 ) 234 - 244 2018.5

低温環境における積層フィルムの経年変化予測に関する研究 Reviewed

湯浅明子，島岐宏，徳満勝久

マテリアルライフ学会誌 30 ( 1 ) 11 - 17 2018.2

ポリエチレン系材料のアルコール中における環境応力破壊に関する研究 Reviewed

ティホングニュングエン，田中隆，石黒翔太，梅木慎吾

成形加工学会誌 29 ( 8 ) 302 - 308 2017.8

カルド修飾CNF/PLAコンポジット材料の力学的・熱的物性評価研究(II) Reviewed

桂田慎也，佐藤嘉和，徳満勝久，山田昌宏，杉本雅行

日本レオロジー学会誌 45 ( 1 ) 25 - 32 2017.1

UHMWPE/HDPE系材料における極低温力学物性改質技術の研究-インフレーションフィルム積層法の検討 Reviewed

井口愛子，徳満勝久，大平英治

材料 66 ( 1 ) 29 - 34 2017.1

カルド修飾CNF/PLAコンポジット材料の力学的・熱的物性評価研究 Reviewed

寺倉弘祐，徳満勝久，山田昌宏，杉本雅行

日本レオロジー学会誌 44 ( 1 ) 39 - 45 2016.1

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 Reviewed

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 2015.7

カルド系材料添加ポリ乳酸の結晶化挙動に関する研究 Reviewed

徳満勝久，松浦拓也，川崎真一，田代孝二

材料 64 ( 1 ) 1 - 6 2015.1

Influence of Electron Beam Irradiation on the Mechanical and Thermal Properties of Polypropylene/Polyamide6 Blends Reviewed International journal

Shigeya Nakamura, Katsuhisa Tokumitsu, Tohru Yamaguchi

Journal of Applied Polymer Science 130 ( 6 ) 4318 - 4326 2013.12

A Study on the Mechanical Properties of Poly(Butylene Terephthalete) Containing Some Elastomer Additives with Reactive Compatibilizers Reviewed

Katsuhisa Tokumitsu, Ken-ichi Nishizaka

Nihon Reoroji Gakkaishi (Journal of the Society of Rheology, Japan) 41 ( 3 ) 145 - 150 2013.6

Physical characteristics of the electrospun nanofiber consisting of the blends of conductive polymer and aromatic polymer Reviewed

Yamashita Yoshihiro, Tanaka Daiki, Tokumitsu Katsuhisa, Kikuchi Kenji, Tashiro Kouji,

Journal of Textile Engineering 59 ( 2 ) 25 - 35 2013.5

Influence of Electron Beam Irradiation on the Mechanical and Thermal Properties of Polypropylene/Polyamide6 Blends Reviewed

Shigeya Nakamura, Katsuhisa Tokumitsu, Tohru Yamaguchi,

Journal of Applied Polymer Science 2013.4

Fabrication and characterization of polysilane: PCBM bulk heterojunction solar cells Reviewed

Kazumi Yoshida, Takeo Oku, Atsushi Suzuki, Tsuyoshi Akiyama, Katsuhisa Tokumitsu, Mika, Nakamura, Masahiro Yamada

Cent. Eur. J. Eng. 3 ( 2 ) 165 - 169 2013.4

Microstructures and Photovoltaic Properties of Polysilane-Based Solar Cells Reviewed

Takeo Oku, Junya Nakagawa, Makoto Iwase, Atsushi Kawashima, Kazumi Yoshida, Atsushi Suzuki, Tsuyoshi Akiyama, Katsuhisa Tokumitsu, Masahiro Yamada, and Mika Nakamura

Jpn. J. Appl. Phys 52 2013.3

A Study on Mechanical Properties of morphological change of Polypropylene/Polyamide with addition of PP-g-MAH through Reactive Processing Method Reviewed

Journal of the Society of Materials Science, Japan 62 ( 1 ) 1 - 7 2013.1

Mechanical properties of the elastomer nanocomposite using polyimide nanofiber made in electrospinning process Reviewed

Journal of Textile Engineering 59 ( 1 ) 7 - 14 2013.1

The effect of adding Polysilane on Heat Fusion Properties of various kinds of Polyethylene Reviewed

K. Tokumitsu, M. Yamada, M. Nakamura, K. Kobori,

Journal of Applied Polymer Science 126 E188 - E194 2012.4

Effect of adding polysilane on melt-flow properties of ultra-high molecular weight PE (UHMWPE) Reviewed

K. Tokumitsu, A. Iguchi, S. Nakamura, M. Yamada, M. Nakamura, K. Kobori

Journal of Applied Polymer Science 126 E403 - E409 2012.4

Study of Application Result Using Rice Husks Molding to Component of a Vihicle Reviewed

Transactions of the Japan Society of Mechanical Engineers 78 ( 786 ) 96 - 104 2012.2

Melt Electrospinning by Cylinder Heating Method Reviewed

Y. Yamashita, K. Tokumitsu, H. Shibata, H. Miyake

Transaction of the Materials Research Society of Japan 37 ( 1 ) 61 - 64 2012.1

Mechanical properties and morphological changes of poly(lactic acid)/polycarbonate/poly(butylene adipate-co-terephthalate) blend through reactive processing-Effect of Fablication Process- Reviewed

Seikei-Kakou 23 ( 12 ) 733 - 742 2011.12

Mechanical properties and morphological changes of poly(lactic acid)/polycarbonate/poly(butylene adipate-co-terephthalate) blend through reactive processing Reviewed

T. Kanzawa, K. Tokumitsu,

Journal of Applied Polymer Science 121 ( 3 ) 2908 - 2918 2011.9

7Li nuclear magnetic resonance studies of hard carbon and graphite/hard carbon hybrid anode for Li ion battery Reviewed

Fujimoto, H., Mabuchi, A., Tokumitsu, K., Chinnasamy, N., Kasuh

Journal of Power Sources 196 ( 3 ) 1365 - 1370 2011.2

Mechanical Properties and Phase Morphology of Poly(Lactic Acid)/Polyamide12 Reviewed

Journal of the Society of Materials Science, Japan 60 ( 1 ) 8 - 13 2011.1

The anode performance of the hard carbon for the Li ion battery derived from the oxygen-containing aromatic precursors Reviewed

Journal of Power Sources 195 ( 21 ) 7452 - 7456 2010.11

Heat Degradation of AS Resin upon Heat-process Cycles Reviewed

Resources Processing 56 ( 4 ) 159 - 164 2009.9

The effect of adding Polysilane Materials into Cyclo-Olefins on their Characteristics Reviewed

Journal of the Society of Materials Science, Japan 58 ( 9 ) 741 - 746 2009.9

ガンマ線および電子線照射LDPEフィルムの力学的性質と分子量分布変化 Reviewed

　宮川栄一，神澤岳史，徳満勝久，田中皓

高分子論文集 66 ( 6 ) 202 - 210 2009.6

リアクティブプロセッシングによるPLA鎖のPEGグラフト化反応に関する研究 Reviewed

　神澤岳史，徳満勝久

材料 58 ( 1 ) 16 - 21 2009.1

熱処理回数に伴うPET/MDPE/相容化剤系材料の相構造変化と力学的特性に関する研究 Reviewed

　中村重哉，徳満勝久，来田村實信，宮川栄一，神澤岳史，田中皓

環境資源工学 55 ( 4 ) 178 - 185 2008.11

PE/PP/相容化剤系材料のモルフォロジーと力学的特性に関する研究 Reviewed

　中村重哉，徳満勝久，来田村實信，宮川栄一，神澤岳史，田中皓

環境資源工学 55 ( 2 ) 56 - 65 2008.6

リサイクルPE/PPペレットへの相容化剤添加による力学的特性の向上に関する研究 Reviewed

　中村重哉，徳満勝久，来田村實信，宮川栄一，田中皓

環境資源工学 54 ( 4 ) 167 - 174 2007.11

Mechanical property and molecular weight distribution change with photo and chemical degradation on LDPE films Reviewed

E. Miyagawa, K. Tokumitsu, A. Tanaka, K. Nitta

Polymer Degradation and Stability, 92 ( 10 ) 1948 - 1956 2007.10

ポリスチレンのマテリアルリサイクルにおける熱劣化２.分子量による影響 Reviewed

　来田村實信，竹内正太，宮川栄一，徳満勝久，田中皓

環境資源工学 54 ( 3 ) 145 - 151 2007.7

低密度ポリエチレンのマテリアルリサイクルにおける熱劣化 Reviewed

　石橋隆史，来田村實信，宮川栄一，徳満勝久，田中皓

環境資源工学 53 ( 2 ) 63 - 69 2006.6

Viscoelastic Properties of bis(phenyl)fluorene-based Cardo Polymers with different Chemical Structure Reviewed

K.Tokumitsu, A. Tanaka, K. Kobori, Y. Kozono, M. Yamada, K. Nitta

Journal of Polymer Science, Part B; Polymer Physics. 43 2259 - 2268 2005.9

ニッケル含有廃液のフェライト化処理によって生成するスラッジの安定化 Reviewed

　来田村実信，野村智樹，徳満勝久，川端成彬，本田由治

水環境学会誌 24 ( 12 ) 850 - 855 2001.10

Characterization of pitches by an ultrasonic method - Change in the molecular aggregation state during air-blowing Reviewed

A. Tanaka, T. Abe, J. Mondori, C. Yamaguchi, K. Tokumitsu, H. Matsui

Carbon 39 1567 - 1573 2001.6

Reduction of the irreversible capacity of a graphite anode by the CVD process, Reviewed

C. Natarajan, H. Fujimoto, K. Tokumitsu, A. Mabuchi, T. Kasuh

Carbon 39 1409 - 1413 2001.3

Relationship between the charge capacity of a turbostratic carbon anode for a Li secondary battery and its structure Reviewed

H. Fujimoto, A. Mabuchi, K. Tokumitsu, T. Kasuh

Carbon 38 871 - 875 2000.9

Structural characterization and electrochemical properties of non-graphitizable carbons for a lithium ion battery Reviewed

K. Tokumitsu, H. Fujimoto, A. Mabuchi, T. Kasuh

Journal of Power Sources 90 206 - 213 2000.4

Effect of mechanical milling of graphite powder on lithium intercalation properties, Reviewed

C. Natarajan, H. Fujimoto, K. Tokumitsu, A. Mabuchi, T. Kasuh

Journal of Power Sources 92 187 - 192 2000.3

High Capacity Carbon Anode for Li-ion battery -A theoretical Explanation- Reviewed

K. Tokumitsu, H. Fujimoto, A. Mabuchi, T. Kasuh

Carbon 37 ( 11 ) 1599 - 1605 1999.9

A Study on the Carbon Structure and Electrochemical Lithium Insertion Mechanism for a Lithium-Ion Battery Reviewed

K. Tokumitsu

1999.7

Electrochemical Properties of Pt/Carbon Ink Electrode for Direct Methanol Polymer Electrolyte Fuel Cells Reviewed

K. Tokumitsu, J.S. Wainright, R.F. Savinell

Journal of New Materials for Electrochemical Systems 2 171 - 178 1999.2

Recent Trends in Carbon Negative Electrode Materials Reviewed

T. Kasuh, A. Mabuchi, K. Tokumitsu, H. Fujimoto

Journal of Power Sources. 68 99 - 101 1997.1

The Estimation of the Rotational Misorientation by the Projected Probability Function of a Displacement of Carbon Layers Planes, Reviewed

H. Fujimoto, A. Mabuchi, K. Tokumitsu, T. Kasuh

Carbon 31 ( 2 ) 193 - 198 1996.9

Charge/Discharge Characteristics of Synthetic Carbon Anode for Lithium Secondary Battery, Reviewed

K. Tokumitsu, A. Mabuchi, H. Fujimoto, T. Kasuh,

Journal of Power Sources 54 444 - 447 1995.10

Irreversible Capacity of Lithium Secondary Battery using Meso-carbon Micro Beads as an Anode Material Reviewed

H. Fujimoto, A. Mabuchi, K. Tokumitsu, T. Kasuh

Journal of Power Sources 54 440 - 443 1995.10

Charge-Discharge Mechanism of Graphitized Mesocarbon Microbeads Reviewed

A. Mabuchi, H. Fujimoto, K. Tokumitsu, T. Kasuh

Journal of Electrochemical Society 142 ( 9 ) 3049 - 3051 1995.9

Electrochemical Insertion of Lithium into Carbon Synthesized from Condensed Aromatics Reviewed

K. Tokumitsu, A. Mabuchi, H. Fujimoto, T. Kasuh

Journal of Electrochemical Society 143 ( 7 ) 2235 - 2239 1995.9

ピッチの品質評価への超音波分析の導入, Reviewed

　水取重司，徳満勝久，山口千春，田中皓，松本弘丈

アロマティックス 47 ( 5,6 ) 175 - 179 1995.5

Charge-Discharge Characteristics of the Mesocarbon Microbeads Heat-Treated at Different Temperatures, Reviewed

A. Mabuchi, K. Tokumitsu, H. Fujimoto, T. Kasuh

Journal of Electrochemical Society 142 ( 4 ) 1041 - 1046 1995.4

New Structural Parameters for Carbon: Comprehensive Crystallization Index and Cavity Index Reviewed

H. Fujimoto, K. Tokumitsu, A. Mabuchi, and T. Kasuh

Carbon 32 ( 7 ) 1249 - 1254 1994.7

コールタールピッチから得られたメソカーボンマイクロビーズの13C-NMR及びESRによる化学構造の検討 Reviewed

山口千春，松好弘明，徳満勝久，馬場澄子，熊谷治夫，真田雄三

炭素 164 193 - 198 1994.4

Effect of Crystallite Size on the Chemical Compositions of the Stage 1 Alkali Metal-Graphite Intercalation Compounds Reviewed

H. Fujimoto, A. Mabuchi, K. Tokumitsu, T. Kasuh, N. Akuzawa

Carbon 32 ( 2 ) 193 - 198 1994.2

Characterization of Pitches by Ultrasonic Method. I. Apparatus and Preliminary Results Reviewed

A. Tanaka, H. Matsumoto, C. Yamaguchi, and K. Tokumitsu

Carbon 32 ( 6 ) 1137 - 1141 1994.2

Preparation of Isotropic Pitch Precursors for General Purpose Carbon Fibers (GPCF) by Air- blowing. I. Preparation of Spinnable Isotropic Pitch Precursor from Coal Tar by Air-blowing Reviewed

T. Maeda, S. M. Zeng, K. Tokumitsu, J. Mondori, I. Mochida

Carbon 31 ( 3 ) 407 - 412 1993.3

Preparation of Isotropic Pitch Precursors for General Purpose Carbon Fibers (GPCF) by Air-blowing. III. Air-blowing of Isotropic Naphthalene and Hydrogenated Coal Tar Pitches with addition of 1,8-dinitronaphthalene Reviewed

S. M. Zeng, T. Maeda, K. Tokumitsu, J. Mondori, I. Mochida

Carbon 31 ( 3 ) 421 - 426 1993.3

Preparation of Isotropic Pitch Precursors for General Purpose Carbon Fibers (GPCF) by Air-blowing. II. Air-blowing of Coal Tar, Hydrogenated Coal Tar, Hydrogenated Coal Tar, and Petroleum Pitches Reviewed

S. M. Zeng, T. Maeda, K. Tokumitsu, J. Mondori, I. Mochida

Carbon 31 ( 3 ) 413 - 419 1993.3

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Papers - TOKUMITSU Katsuhisa