論文 - 川角　昌弥

Scaling law for elastic modulus in filler-reinforced composite materials 招待有り 査読有り

A Koiwai, M Kawasumi, S Hyodo, T Motohiro, S Noda, O Kamigaito

"Benibana" International Symposium on How to Improve the Toughness of Polymers and Composites--Toughness, Fracture and Fatigue of Polymers and Composites     頁： 105 - 110   1990年

A solid state NMR study on crystalline forms of nylon 6

Okada A., Kawasumi M., Tajima I., Kurauchi T., Kamigaito O.

Journal of Applied Polymer Science   37 巻 ( 5 ) 頁： 1363 - 1371   1989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：Journal of Applied Polymer Science  

High‐resolution 13C‐NMR spectra were studied for two different crystalline structures of nylon 6 in the solid state by the cross polarization/magic angle spinning (CP/MAS) method. Two crystalline structures, α‐form and γ‐form, gave different chemical shifts for methylene carbons. The results showed that the hydrogen bonds between intermolecular chains are stronger in the γ‐form than in the α‐form. This strongly supports the results of the X‐ray study of nylon 6 by Malta et al. Our results also showed that interamolecular delocalization of positive charges occurs in the γ‐form through hyperconjugation in which the dihedral angle between the π bond and neighboring σ bonds is 30° while no such effect can be expected in the α‐form in which the angle is 0°. Copyright © 1989 John Wiley & Sons, Inc.

DOI： 10.1002/app.1989.070370519

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SWELLING BEHAVIOR OF MONTMORILLONITE BY POLY-6-AMIDE 査読有り 国際誌

FUKUSHIMA Y, OKADA A, KAWASUMI M, KURAUCHI T, KAMIGAITO O

CLAY MINERALS   23 巻 ( 1 ) 頁： 27 - 34   1988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）  

DOI： 10.1180/claymin.1988.023.1.03

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Vinylbenzyl-type polyamide macromer synthesized from bicyclic oxalactam. preparation and characterization of graft copolymer composed of polystyrene as a stock and hydrophilic polyamide as branches

Hashimoto K., Sumitomo H., Kawasumi M.

Polymer Journal   17 巻 ( 9 ) 頁： 1045 - 1054   1985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）   出版者・発行元：Polymer Journal  

Vinylbenzyl-type polyamide macromers (1) of various average molecular weights (Mn; 3900, 5400, and 8400) were prepared by the anionic ring-opening polymerization of a bicyclic oxalactam, 8-oxa-6-azabicyclo[3.2.1]octan-7-one (abbreviated as BOL, 2) followed by a reaction with p-vinylbenzylamine. The relative reactivity of the macromer (M1) in the radical copolymerization with styrene (M2) was found to be lower than that of p-methylstyrene from the estimation of the reciprocal monomer reactivity ratio (1/r2). The resulting graft copolymer composed of a polystyrene stock and polyamide branches was characterized by structural analysis, solubility test, and determination of moisture sorption. Two kinds of transparent binary blend films, which were i) the graft copolymer and homopolystyrene and ii) the graft copolymer and polyBOL, were cast on a glass plate from the corresponding chloroform and chloroform-methanol (9:1) solutions, respectively. In the case of the former film comprising mainly polystyrene, the hydrophilic polyamide segment of the graft copolymer as a really minor component was found to be located on the glass-side surface from the contact angle measurement and the attenuated total reflection-infrared spectroscopy. © 1985 The Society of Polymer Science, Japan.

DOI： 10.1295/polymj.17.1045

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CiNii Research

Preparation of a new polyamide macromer having a vinylbenzyl group from bicyclic oxalactam and its radical copolymerization with styrene

Hashimoto K., Sumitomo H., Kawasumi M.

Polymer Bulletin   11 巻 ( 2 ) 頁： 121 - 128   1984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：Polymer Bulletin  

A new polyamide macromer having a vinylbenzyl end group (1), of which molecular weight was 3700-3800, was prepared by the anionic polymerization of bicyclic oxalactam (2) followed by the reaction with p-vinylbenzylamine. Its radical copolymerization with styrene was conducted to obtain a novel graft copolymer consisting of a polystyrene stock-chain and hydrophilic polyamide branches. © 1984 Springer-Verlag.

DOI： 10.1007/BF00258018

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