Nobuyuki Furukawa

National Institute of Technology, Sasebo College

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Masatoshi Yuasa

Nippon Steel Chemical and Material (Japan)

Yasuharu Yamada

IBM Research - Tokyo

Yoshiharu Kimura

Kyoto Institute of Technology

Tsutomu Takeichi

Toyohashi University of Technology

Takehiro Kawauchi

Ryukoku University

Fumihiro Omori

Nippon Steel Chemical and Material (Japan)

Masaya Furukawa

Nippon Steel (Japan)

Shoya Uchida

Tokyo Institute of Technology

Yukihiro Wada

Nippon Steel Chemical and Material (Japan)

Yuki JHONO

Cooperative Institutions

Toyohashi University of Technology

Nippon Steel Chemical and Material (Japan)

Nippon Steel (Japan)

Osaka University

Tokyo Institute of Technology

National Institute of Technology, Sasebo College

Kyushu University

Nagoya University

Yamagata University

Kyoto University

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The structural analysis of Cardo silicone polyimides by high resolution solid-state 13C, 15N and 29Si NMR

Journal of Molecular Structure (1998)

Masaaki Shinohara Koji Saito Moriaki Hatakeyama Masatoshi Yuasa Nobuyuki Furukawa

Moiety

Thermal Stability

10.1016/s0022-2860(97)00298-6

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Citations (1)

Properties of a New Class of Heat-resistant PCM Paint Using Polysiloxane-block-Polyimide as Matrix-resin

Nobuyuki Furukawa Toshihide Itahara Yukihiro Wada Masatoshi Yuasa Hirotada Kato

Matrix (chemical analysis)

Heat Resistance

Source

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Citations (0)

Preparation of Imide-modified Benzoxazines and Characterization of Cured Films

Journal of Photopolymer Science and Technology (2015)

Tatsuya Nagata Kosaku Kurowarabi Takehiro Kawauchi Akihiko Matsumoto Nobuyuki Furukawa

We synthesized novel monofunctional and bifunctional benzoxazines having imide groups. Brown-colored transparent films were obtained by curing the benzoxazines up to 240 °C. Monofunctional benzoxazine gave brittle film, but bifunctional benzoxazine gave tough film. Viscoelastic analysis revealed that glass transition temperature of the polybenzoxazine film obtained from the bifunctional benzoxazine was 289 °C, about 90 °C higher than that of a typical polybenzoxazine. Thermogravimetric analyses revealed that the introduction of imide groups was also effective to improve the thermal stability of polybenzoxazines.

Thermogravimetric analysis

Imide

Thermal Stability

10.2494/photopolymer.28.145

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Citations (5)

Thermomechanical and Adhesive Properties of Copolyimides with Alchoxysilyl Group in the Polysiloxane Segments

Journal of The Adhesion Society of Japan (2000)

Nobuyuki Furukawa Masatoshi Yuasa Fumihiro Omori

ポリシロキサン鎖にアルコキシシリル基を含有するポリシロキサン－block－ポリイミドを合成し，その熱機械的特性および密着性について検討を行った。このポリマーは，塗膜形成過程において，アルコキシシリル基の加水分解重縮合反応が進行し，極性有機溶剤に対して不溶であった。この架橋反応は，ポリシロキサン鎖で進行するため，ポリシロキサン含有率が多いほど架橋密度が高くなり，また，ポリシロキサン含有率で架橋密度は，大きく異なると考えられる。ポリシロキサン含有率50wt% のポリマーでは，架橋反応していないポリマーと比較して，引張弾性率が大きくなり，ガラス転移温度以下の熱膨張係数，ガラス転移以上での熱膨張率ともに低下した。また，ポリシロキサン鎖のアルコキシシリル基の架橋により熱分解温度は，大幅に向上することが明らかになった。さらにこの樹脂をガラス基板上に塗布した後，その塗膜の密着性について評価を行ったところ，耐熱密着性，耐湿密着性ともに優れていた。

10.11618/adhesion.36.144

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Characterization of polysiloxane-block-polyimides with silicate group in the polysiloxane segments

Polymer (1999)

Nobuyuki Furukawa Masatoshi Yuasa Yoshiharu Kimura

Hydrosilylation

Siloxane

10.1016/s0032-3861(98)00256-0

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Citations (24)

Epoxy Resins and Phenol-Formaldehyde Resins

Elsevier eBooks (2012)

Tsutomu Takeichi Nobuyuki Furukawa

Phenol formaldehyde resin

10.1016/b978-0-444-53349-4.00157-6

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Citations (32)

High-Performance Polybenzoxazine Derived from Polyfunctional Benzoxazine Composed of an Oligonuclear Phenolic Compound Having a 4,4′-Dimethylenebiphenyl Linker

Macromolecular Chemistry and Physics (2018)

Takehiro Kawauchi Tsubasa Osawa Shunichiro Matsumura Takuto Mori Nobuyuki Furukawa

Abstract A novel polyfunctional benzoxazine monomer, OP‐a , is synthesized from aniline, formaldehyde, and an oligonuclear phenolic compound (OP) with a 4,4′‐dimethylenebiphenyl group as the phenol linker. After thermal curing of OP‐a up to 240 °C, a brown‐colored, transparent polybenzoxazine ( POP‐a ) film is obtained. The mechanical and thermal properties of the POP‐a film are investigated by tensile test, dynamic mechanical analysis (DMA), and thermogravimetric analysis (TGA). The POP‐a film is extremely tough compared with a typical polybenzoxazine ( PB‐a ) film. The elongation at break of the POP‐a film is 7.6%, which is surprisingly large for the highly cross‐linked thermoset. The high cross‐link density is suggested from the very high storage modulus (over 1 GPa) above the glass transition temperature ( T g ) observed by DMA. The T g of POP‐a is also improved significantly to T g = 223 °C, which is approximately 50 °C higher than that of PB‐a . Moreover, TGA reveals that the thermal stability of POP‐a is also enhanced.

Thermogravimetric analysis

Thermal Stability

Thermosetting polymer

10.1002/macp.201800317

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Citations (5)

Synthesis and properties of novel thermosetting polysiloxane-block-polyimides with vinyl functionality

Polymer (1998)

Nobuyuki Furukawa Masatoshi Yuasa Yasuharu Yamada Yoshiharu Kimura

Thermosetting polymer

Maleimide

10.1016/s0032-3861(97)00614-9

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Citations (24)

Effect of Bis-Imide Additives on Dielectric Constant of Polyimides.

KOBUNSHI RONBUNSHU (1997)

Yasuharu Yamada Nobuyuki Furukawa

フッ素およびケイ素を含む3種のビスイミド化合物を合成し, ポリイミドへの添加による誘電率および熱的, 機械的特性への添加効果について検討した. これらの化合物の添加が芳香族ポリイミド (ポリピロメリトイミド) の誘電率を低下させることが明らかとなった. その効果は, 10wt%までは添加量の増加とともに誘電率は低下したが, 10wt%以上では効果は変わらなかった. また, フッ素含有ビスイミド化合物の方がシロキサン含有ビスイミド化合物より低減効果が大きかった. 一方, ミクロ相分離構造を有するシロキサン-イミドブロック共重合体へのこれら化合物の添加では, 誘電率の低減効果は認められなかった. 芳香族ポリイミドへのこれら化合物の添加は, 添加量の増加とともに熱的, 機械的特性が低下したが, シロキサン-イミドブロック共重合体への添加では, フッ素含有ビスイミド化合物の添加が熱的特性や弾性率を一部向上させることが認められた. 本検討により, 添加剤によるポリイミドの特性改良は, 添加剤の分子構造および特性のみならず, 基本樹脂の特性とも関係することが明らかとなった.

Imide

Constant (computer programming)

10.1295/koron.54.537

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Citations (0)

Structure analysis of a soluble polysiloxane-block-polyimide and kinetic analysis of the solution imidization of the relevant polyamic acid

Journal of Polymer Science Part A Polymer Chemistry (1998)

Nobuyuki Furukawa Masatoshi Yuasa Yoshiharu Kimura

A series of polysiloxane-block-polyimides were synthesized by solution imidization of the polyamic acids derived from the combination of 3,3′,4,4′-diphenylsulfonetetracarboxylic dianhydride (DSDA), 2,2-bis[4-(4-aminophenoxy)phenyl]propane (BAPP), and diamino(polysiloxane) (PSX (Mw = 750)) in N-methyl-2-pyrrolidone (NMP). Their structures were analyzed by 1H-, 13C-, and 29Si-NMR spectra as well as by IR spectroscopy. The solid-state NMR spectrum was also measured to determine the spin–lattice relaxation time of the copolyimides. The observed relaxation times of both aromatic and polysiloxane segments were similar in the copolyimides having 10–30 wt % of PSX, while those in the copolyimide with 50 wt % of PSX was significantly different. This may be attributed to the morphology change due to the increase in PSX composition in the polymer backbone. The reduced viscosity of the copolyimides could be controlled by changing the monomer ratio in the feed or by adding an end-capping reagent such as phthalic anhydride into the polymerization system. The kinetic study of the solution imidization revealed that the imidization reaction obeyed second-order kinetics. The activation energy calculated for this imidization was 99.2 kJ/mol, being similar to that for the imidization of the DSDA-based aromatic polyimides. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. A Polym. Chem. 36: 2237–2245, 1998

Phthalic anhydride

10.1002/(sici)1099-0518(19980930)36:13<2237::aid-pola10>3.0.co;2-b

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Citations (16)