研究者詳細 - 山崎　慎一

論文 - 山崎　慎一

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Effect of the blend ratio of cyclic and linear polyethylene blends on isothermal crystallization in the quiescent state 査読

Keiko Kobayashi, Hironori Atarashi, Shinichi Yamazaki, Kunio Kimura

Polymer Journal 55 ( 12 ) 1393 - 1398 2023年8月

Role of entanglement species in the formation of shish-like fibril crystals elucidated by cyclic polyethylene 査読

Keiko Kobayashi, Yuya Saito, Shinichi Yamazaki, Kunio Kimura

Journal of Fiber Science and Technology 79 ( 8 ) 177 - 184 2023年8月

Influence of Preparation Conditions on Porosity of Aromatic Polyamide Hollow Spheres 査読

Hirofumi Nakayama, Naoto Kibayashi, Hironori Atarashi, Shinichi Yamazaki, Kunio Kimura

Journal of Fiber Science and Technology 79 ( 8 ) 185 - 191 2023年

Formation of shish-like fibril crystals from the melt of blends of cyclic and linear polyethylene under shear flow 査読

Keiko Kobayashi, Shinichi Yamazaki, Kunio Kimura

Polymer Journal 54 ( 7 ) 913 - 920 2022年4月

Morphology and growth rate of spherulite of cyclic poly(ε-caprolactone) having a triazole group at the closing point 査読

Atsushi Shinya, Ryogo Ono, Hironori Atarashi, Shinichi Yamazaki, Kunio Kimura

Polymer 202 122660 - 122660 2020年5月

Molecular weight dependence of the growth rate of spherulite of cyclic poly(ε-caprolactone) polymerized by ring expansion reaction 査読

Ryogo Ono, Hironori Atarashi, Shinichi Yamazaki, Kunio Kimura

Polymer 194 122403 - 122403 2020年4月

Microspheres with dimple morphology of poly(p-oxyferuloyl) prepared by reaction-induced phase separation

Hironori Atarashi, Masahaya Sugimoto, Shinichi Yamazaki, Kunio Kimura

Fiber Society 2018 Spring Conference: Fibers and Textiles for Value Creation in Connected Industries 2018年

Size control of aromatic polyamide hollow spheres prepared by reaction-induced phase separation 査読

Hirofumi Nakayama, Naoto Adachi, Hironori Atarashi, Tetsuya Uchida, Shinichi Yamazaki, Kunio Kimura

POLYMER 111 239 - 243 2017年2月

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

Size control of the poly (1,4-phenylene-5-hydroxyisophthalamide) hollow spheres was examined by tuning the polymerization condition, focusing on concentration, temperature and solvent. Higher concentration lowered the diameter owing to the higher degree of super-saturation for nucleation. Temperature drop during the polymerization just before the nucleation was so effective to make the diameter smaller. Moreover, the diameter was susceptive to the solubility of oligomers in the solvent, and higher content of liquid paraffin in the aromatic solvent lowered the solubility, resulting in the decrease in the diameter. Based on these results, the combination of the temperature drop and the solvent effect was the most desirable to prepare the smallest hollow spheres, and the diameter of hollow spheres could be controlled from 4.4 to 0.7 mu m. (C) 2017 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.polymer.2017.01.060

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Preparation of aromatic polyimide particles having clear morphology by polymerization of salt monomers 査読

Daisaku Shojo, Hidekazu Sugimori, Shinichi Yamazaki, Kunio Kimura

HIGH PERFORMANCE POLYMERS 28 ( 10 ) 1139 - 1150 2016年12月

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

Crystals of salt monomer prepared from aromatic tetracarboxylic acids and aromatic diamines were polymerized at 220 degrees C for 3 h and at 400 degrees C for 3 h under argon flow. Highly crystalline polyimide particles having clear morphology were obtained with good yield. They were lozenge-like crystals, long plate-like crystals, fibrillar crystals, and spherical aggregates of plate-like crystals. The crystals of salt monomer were polymerized in the solid-state with maintaining the morphology, and therefore the morphology of the polyimide particles were the same to that of the crystals of the corresponding salt monomer. Molecular orientation in the lozenge-shaped crystal of poly(p-phenylene pyromelliteimide) was examined by selected area electron diffraction, and the polymer molecules aligned perpendicular to the plate plane which was the direction of the thickness. Obtained particles possessed good thermal stability.

DOI： 10.1177/0954008315619998

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Preparation of poly(ether ketone)s derived from 2,5-furandicarboxylic acid via nucleophilic aromatic substitution polymerization 査読

Yusuke Kanetaka, Shinichi Yamazaki, Kunio Kimura

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 54 ( 19 ) 3094 - 3101 2016年10月

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

From the viewpoint of the suppression of the petroleum consumption, aromatic poly(ether ketone)s (PEKs) were prepared by the nucleophilic aromatic substitution polymerization of 2,5-bis(4-fluorobenzoyl)furan (BFBF) synthesized from biomass and aromatic bisphenols. The model reaction of BFBF and p-methoxyphenol revealed that BFBF possessed enough reactivity for the nucleophilic aromatic substitution reactions. The polymerizations of BFBF and aromatic bisphenols afforded high molecular weight polymers with good yields in N-methylpyrrolidone and diphenyl sulfone for several hours. The longer polymerization time brought about the formation of insoluble parts in any solvents and reduction of molecular weight. The obtained PEKs were thermoplastics and exhibited good thermal stability, mechanical properties, and chemical resistance comparable to common high-performance polymers. The thermal properties were tunable with the structure of bisphenols. (c) 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 3094-3101

DOI： 10.1002/pola.28193

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Preparation of helical crystals of aromatic poly(ester-imide) and on-off switching of helix formation 査読

Takuya Ohnishi, Miki Nakagawa, Kanji Wakabayashi, Tetsuya Uchida, Shinichi Yamazaki, Kunio Kimura

POLYMER 98 378 - 386 2016年8月

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

Preparation of poly[4-(5-oxy-1,3-dioxoisoindoline-2-yl)benzoyl] (PODB) crystals, which was an intractable aromatic poly(ester-imide), was examined by means of reaction-induced crystallization of oligomers during the polymerization. Highly crystalline PODB helical ribbons were obtained by the polymerization of N-(4-carboxyphenyl)-4-acetoxyphthalimide in aromatic solvent at 280-330 degrees C at a concentration of 0.5-1.0%. The PODB molecules aligned along the long axis of the helical ribbon. The pitch of the helix increased with the polymerization temperature and it could be controlled from 320 nm to 1.3 mu m. Further, the fibrillar PODB crystals comprised of the helical and the non-helical blocks were prepared by the on-off switching of the helical morphology with the changing the temperature and the concentration of the polymerization. These results provided the methodology for the morphology control of polymer crystals. (C) 2016 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.polymer.2016.06.055

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Preparation of Poly(ether ketone)s Derived from 2,5-Furandicarboxylic Acid by Polymerization in Ionic Liquid 査読

Yusuke Kanetaka, Shinichi Yamazaki, Kunio Kimura

MACROMOLECULES 49 ( 4 ) 1252 - 1258 2016年2月

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

Aromatic poly(ether ketone)s were synthesized by the Friedel Crafts polymerization of 2,5-furandicarbonyl dichloride prepared from biomass and petroleum-based aromatic ethers such as diphenyl ether and 1,4-diphenoxybenzene with aluminum chloride (AlCl3). The polymerizations in common molecular solvents such as 1,2-dichloroethane and nitrobenzene did not afford polymers. The Friedel-Crafts polymerization usually undergoes in the swollen gel of the oligomer-AlCl3 complexes; the precipitated physical gels had not been enough swollen. The polymerizations were carried out in various ionic liquids to form swollen gels. The polymerizations proceeded in specific ionic liquid such as 1-butyl-3-methylimidazolium chloride ([C(4)min] CO, and high molecular weight polymers were obtained with good yield. The gels formed in [C(4)mim] Cl were more highly swollen, and additionally the rate constant estimated by the model reaction of 2,5-furandicarbonyl dichloride and anisole was higher in [C4(m)im]Cl than that in 1,2-dichloroethane. The obtained poly(ether ketone)s exhibited good thermal stability and chemical resistance comparable to common poly(ether ketone)s.

DOI： 10.1021/acs.macromol.5b02788

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One-Pot Preparation of Aromatic Poly(ester-imide) Crystals by Crystallization during Polymerization 査読

Takuya Ohnishi, Shinichi Yamazaki, Kunio Kimura

JOURNAL OF FIBER SCIENCE AND TECHNOLOGY 72 ( 2 ) 49 - 53 2016年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SOC FIBER SCIENCE TECHNOLOGY

One-pot preparation of poly[ 4-(5-oxy-1,3-dioxoisoindolin-2-yl) benzoyl] (PODB) crystals which was an aromatic poly(ester-imide) was examined by means of the reaction-induced crystallization during polymerization of 4-acetoxyphthalic anhydride (APA) and 4-aminobenzoic acid (AmBA). Two-step heating program was suitable for the formation of PODB crystals. The reaction of APA and AmBA at 150 degrees C, which was much lower than the polymerization temperature, was of importance to synthesize N-(4-carboxyphenyl)-4-acetoxyphthalimide. Even though the amide moiety was incorporated, the PODB crystals were formed as precipitates by heating at 150 degrees C and then at 280-350 degrees C. Morphology of PODB depended on the polymerization conditions and fibrillar crystals, rod-like crystals and ribbon-like crystals were obtained. This result provided a novel one-pot procedure for the control of the PODB morphology.

DOI： 10.2115/fiberst.2016-0008

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High Performance Polyesters Prepared from Bio-Based 2,5-Furandicarboxylic Acid 査読

Yusuke Kanetaka, Shinichi Yamazaki, Kunio Kimura

JOURNAL OF FIBER SCIENCE AND TECHNOLOGY 72 ( 2 ) 54 - 60 2016年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SOC FIBER SCIENCE TECHNOLOGY

Aromatic polyesters were synthesized by the polymerization of bio-based 2,5-furandicarboxylic acid (FDCA) with petroleum-based 1,3-and 1,4-diacetoxybenzene (DAB) from the viewpoint of the suppression of the petroleum consumption to develop the sustainable development society. Polyesters prepared at the molar ratio of 1,4-DAB in DAB (chi) of less than 60 mol% showed meltability under decomposition temperature. When the value of chi was 20-60 mol%, the polyesters exhibited optical anisotropicity in melt phase, suggesting the thermotropic liquid crystallinity. The phase transition temperature of these polyesters depended on the composition and it was tunable by the. value. The film of the polyesters prepared at. of 20 mol% possessed 1.2 GPa of the modulus, 26.0 MPa and 2.9% of the strength and elongation at break, respectively. Polyesters based on FDCA possessed good thermal stability and mechanical properties comparable to common aromatic polyesters.

DOI： 10.2115/fiberst.2016-0009

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Synthesis of Poly(ether ketone)s from 2,5-Thiophenedicarboxylic Acid 査読

Yusuke Kanetaka, Shinichi Yamazaki, Kunio Kimura

JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY 29 ( 2 ) 243 - 246 2016年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：TECHNICAL ASSOC PHOTOPOLYMERS,JAPAN

The Friedel-Crafts polymerization of 2,5-thiophenedicarbonyl dichloride and diphenyl ether in 1,2-dichloroethane afforded only low molecular weight of poly(ether ketone) containing thiophene-ring. In contrast to this, the polymerization in 1-butyl-3-methylimidazolium chloride-aluminum chloride mixture gave high molecular weight polymers. The polymerizations in ionic liquids were a new approach to expand possibility of polymer synthesis such as preparation of polymer containing heterocyclic rings. The obtained poly(ether ketone) exhibited good thermal stability and chemical resistance comparable to common poly(ether ketone)s.

DOI： 10.2494/photopolymer.29.243

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Preparation of poly(ester-imide) ribbons comprised of helical and non-helical blocks by copolymerization 査読

T. Ohnishi, T. Uchida, S. Yamazaki, K. Kimura

RSC ADVANCES 6 ( 104 ) 101995 - 102002 2016年

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

Helical ribbons of poly[4-(5-oxy-1,3-dioxoisoindoline-2-yl) benzoyl] (PODB) were previously prepared by the homo-polymerization of N-(4-carboxyphenyl)-4-acetoxyphthalimide (CAP) in aromatic solvents. The copolymerization of CAP and p-acetoxybenzoic acid (ABA) was examined to change the helical morphology. The helical morphology was extinguished by the copolymerization of a small amount of ABA at 280 degrees C at a concentration of 1.0% in aromatic solvent. Based on these results, ABA was added stepwise during the homo-polymerization of CAP. When a small amount of ABA was added, copolymer crystals comprised of helical and non-helical blocks were formed. The non-helical blocks grew on the PODB helical ribbons by the precipitation of co-oligomers. This result provides a novel method to control helical morphology by copolymerization.

DOI： 10.1039/c6ra22494f

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Hydrothermal synthesis of aromatic polyimide particles by using reaction-induced crystallization 査読

Daisaku Shojo, Shinichi Yamazaki, Kunio Kimura

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 53 ( 24 ) 2795 - 2799 2015年12月

Consideration on formation mechanism of aromatic polyamide hollow spheres prepared by reaction-Induced phase separation 査読

Hirofumi Nakayama, Yuji Fujitsu, Tetsuya Uchida, Shinichi Yamazaki, Kunio Kimura

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 53 ( 17 ) 1966 - 1974 2015年9月

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

Hollow spheres of poly(1,4-phenylene-5-hydroxyisophthalamide) had been obtained by the reaction-induced phase separation during polymerization of 5-hydroxyisophthalic acid and 1,4-phenylene diamine in an aromatic solvent. In this study, formation mechanism of the hollow spheres was considered from the view points of eliminated small molecules, polymer structure, and cross-linking reaction. With respect to the eliminated small molecules, water was the most desirable to form gas-bubbles in droplets compared with methanol and acetic acid, due to the insolubility into the polymerization system. Rigid polymer structure was also needed to prepare hollow spheres owing to the rapid solidification of droplets. Further, phenolic hydroxyl group in 5-hydroxy-1,3-phenylene moiety caused the ester-amide exchange reaction to form cross-linked skin layer in the droplets. The efficient formation of the skin layer was important to encapsulate gas-bubbles in the droplets, resulting in the formation of hollow structure. (c) 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 1966-1974

DOI： 10.1002/pola.27683

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Preparation of aromatic polyesters by direct polymerization in the presence of boronic anhydride under non-stoichiometric condition 査読

Masahiro Kihara, Yuma Sakakiyama, Shinichi Yamazaki, Kunio Kimura

POLYMER 66 222 - 229 2015年6月

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

Direct polymerizations of p-hydroxybenzoic acid (HBA) and 2-hydroxy-6-naphthoic acid (HNA) in the presence of boronic anhydride were examined by using crystallization under non-stoichiometric condition. The polymerizations were carried out with the addition of monofunctional compounds such as an aromatic carboxylic acid and a phenol. High molecular weight poly(p-oxybenzoyl) (PUB) and poly(2-oxy-6-naphthoyl) (PUN) were obtained in the form of precipitates, and their molecular weights were much higher than those calculated according to the stoichiometric imbalance. Oligomers were formed by the direct polymerization with eliminating water in the solution, and then they were precipitated to form the crystals at the initial stage of the polymerization. Oligomers end-capped by monofunctional compounds were also formed in the solution, but the polymerization continued with the elimination of monofunctional compounds by the ester exchange reaction. The end-capped oligomers were precipitated in the middle of the polymerization, and the polymerization proceeded efficiently even in the precipitated crystals by not only the direct polymerization but also the ester exchange polymerization, resulting in the increase in molecular weight. (C) 2015 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.polymer.2015.04.019

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バイオベーススーパーエンジニアリングプラスチック : フランジカルボン酸を原料とした芳香族ポリエーテルケトンの合成

兼高悠輔, 山崎慎一, 木村邦生

プラスチックス : 日本プラスチック工業連盟誌 65 ( 7 ) 62 - 66 2014年7月

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論文 - 山崎 慎一

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論文 - 山崎　慎一