Faculty Profiles - KAWASUMI Masaya

Papers - KAWASUMI Masaya

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Scaling law for elastic modulus in filler-reinforced composite materials Invited Reviewed

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 page： 105 - 110 1990

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 Vol. 37 ( 5 ) page： 1363 - 1371 1989.2

Language：English Publishing type：Research paper (scientific journal) Publisher：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

Web of Science

Scopus

SWELLING BEHAVIOR OF MONTMORILLONITE BY POLY-6-AMIDE Reviewed International journal

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

CLAY MINERALS Vol. 23 ( 1 ) page： 27 - 34 1988.3

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 Kazuhiko, Sumitomo Hiroshi, Kawasumi Masaya

Polymer Journal Vol. 17 ( 9 ) page： 1045 - 1054 1985.9

Language：English Publishing type：Research paper (scientific journal) Publisher：The Society of Polymer Science, Japan

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.

DOI： 10.1295/polymj.17.1045

Web of Science

Scopus

CiNii Research

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

Hashimoto K.

Polymer Bulletin Vol. 11 ( 2 ) page： 121 - 128 1984.2

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