Y
Yoshiharu Kimura
Researcher at Kyoto Institute of Technology
Publications - 324
Citations - 10519
Yoshiharu Kimura is an academic researcher from Kyoto Institute of Technology. The author has contributed to research in topics: Polymerization & Copolymer. The author has an hindex of 51, co-authored 321 publications receiving 9081 citations. Previous affiliations of Yoshiharu Kimura include Teijin & Shimadzu Corp..
Papers
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Journal ArticleDOI
Melt Spfnniiig and Hydrolysis of Poly(glycoIic acid)
Abstract: グリコリドの開環重合により高分子量ポリグリコール酸を合成し, その末端水酸基を無水酢酸により封ずることにより安定化した. この重合体の熱的性質及びレオロジカルな性質をDTAとずり試験とにより測定した. DTA曲線からは転移温度がわかっただけであった (Tg=37℃及びTm=224℃). しかし, ずり粘度の測定結果から異常に大きな流動の見掛活性化エネルギー32kcal/molが得られた. このことから回転粘度計内で熱分解が起こったものと考えられる. 実験用溶融紡糸機を用いて240℃で安定な紡糸ができ, 均一な繊維が得られた. 65℃の水中で延伸し, 190℃で10分間熱処理した後, 強度1GPa弾性率14GPaの繊維を37℃に保った擬似人工体液 (PECF; pHが8.2の緩衝溶液), 生理食塩水, 蒸留水あるいはエタノール中でin vitro加水分解を試みた. 水系溶液中では, まず表面に亀裂が生じ, この亀裂が繊維表面全体に広がり, 最後に多くの細片が繊維から脱落し細化が起こる. 引張特性も同様に変化した. しかし, エタノール中では, 外観及び力学的性質ともまったく変化を示さなかった.
Journal ArticleDOI
An Universal Stoichiometric Relationship between Weight Loss and Glucose Formation in the Enzymatic Treatment of Cellulosic Fibers with Cellulase from Flamentous Fungi
Shigeyuki Nakano,Ryuji Hirase,Kazuhiko Komurasaki,Ahmed El-Salmawy,Shigeru Kunugi,Yoshiharu Kimura +5 more
TL;DR: Enzymatic hydrolysis of some natural and regenerated cellulosic fibers was studied by use of a cellulase originated from Filamentous fungi and a good linear plot was attained between the total weight decrease and the amount of the produced glucose.
Journal ArticleDOI
Poly(oxyethylene) diglycolic acid: A novel blending antistatic agent for polyamide fibres
TL;DR: In this article, poly(oxyethylene) diglycolic acids with average molecular weights of Mn = 8 400 (Ia), 3 300 (Ib), and 1 000 (Ic) were used as blending anti-electrostatic agents for nylon 6 (Ny6) fibres.
Patent
Zwitter-ionic polymer
TL;DR: In this paper, a zwitter-ionic polymer is composed of repeating units of formulasI, II and III, where m is 2, 3 and R is H, a 1-25C alkyl, aryl; R is alkylene, phenylene, aralkylene; Y is a mono- or bivalent anionic group.
Patent
Production of condensation polymer
TL;DR: In this article, a polyethyleneoxydiglycolic acid of formula I (wherein n is 4-300) is polycondensed with a diamine in a molar ratio, latter/former, of 0.5-2/1 in a temperature range of 50-300 deg.