Faculty Profiles - KAWASUMI Masaya

Papers - KAWASUMI Masaya

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SWELLING BEHAVIOR OF MONTMORILLONITE CATION EXCHANGED FOR OMEGA-AMINO ACIDS BY EPSILON-CAPROLACTAM Reviewed

USUKI A, KAWASUMI M, KOJIMA Y, OKADA A, KURAUCHI T, KAMIGAITO O

JOURNAL OF MATERIALS RESEARCH Vol. 8 ( 5 ) page： 1174 - 1178 1993.5

SYNTHESIS OF NYLON 6-CLAY HYBRID

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

JOURNAL OF MATERIALS RESEARCH Vol. 8 ( 5 ) page： 1179 - 1184 1993.5

Synthesis of nylon 6–clay hybrid by montmorillonite intercalated with ϵ‐caprolactam International journal

Kojima Y., Usuki A., Kawasumi M., Okada A., Kurauchi T., Kamigaito O.

Journal of Polymer Science Part A: Polymer Chemistry Vol. 31 ( 4 ) page： 983 - 986 1993.3

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Polymer Science Part A: Polymer Chemistry

It was found that montmorillonite was intercalated with ϵ‐caprolactam. X‐ray diffraction revealed that the chain axes of the ϵ‐caprolactam were parallel to the montmorillonite plates. The intercalated montmorillonite was swollen by molten ϵ‐caprolactam at 200°C. ϵ‐Caprolactam and 6‐aminocaproic acid (accelerator) were polymerized with the intercalated montmorillonite at 260°C for 6 h, yielding a nylon 6‐clay hybrid. X‐ray diffraction and transmission electron micrography revealed that the silicate layers of the hybrid were uniformly dispersed in the nylon 6 matrix. Mechanical properties of the hybrid were improved. The strength and the modulus of the hybrid increased compared with the previously reported nylon 6 clay‐hybrid (NCH) synthesized by montmorillonite intercalated with 12‐aminolauric acid. The heat distortion temperature (HDT) of the hybrid was 164°C, which was 12°C higher than that of NCH. © 1993 John Wiley & Sons, Inc. Copyright © 1993 John Wiley & Sons, Inc.

DOI： 10.1002/pola.1993.080310418

Web of Science

Scopus

Gas Barrier Properties of Nylon 6-Clay Hybrid.

KOJIMA Yoshitsugu, USUKI Arimitsu, KAWASUMI Masaya, OKADA Akane, KURAUCHI Toshio, KAMIGAITO Osami

Materials life Vol. 5 ( 1/2 ) page： 13 - 17 1993

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：MATERIALS LIFE SOCIETY, JAPAN

Nylon 6-clay hybrid (NCH) is a molecular composite of nylon 6 and uniformly-dispersed silicate layers of montmorillonite. Gas permeabilities in NCH films were measured to estimate the gas barrier properties. Montmorillonite crystal layers assume planar orientation in NCH. Crystallinity of nylon 6 in NCH was a little larger than that of nylon 6. The gas permeability in NCH decreased with the increase in the montmorillonite content. NCH had a good gas barrier properties compared with nylon 6. The superior gas barrier properties of NCH are ascribed to the increase of tortuosity factor due to the planar orientation of montmorillonite crystal layers.

DOI： 10.11338/mls1989.5.13

CiNii Research

Synthesis and Liquid Crystallinity of Cyclic Polyethers Containing Mesogenic Units in Their Main Chains

KAWASUMI Masaya, PERCEC Virgil

Preprints of symposium on liquid crystals Vol. 19 ( 0 ) page： 208 - 209 1993

Liquid-Crystalline Polyethers Based on Conformational Isomerism. 31. Absence of Chiral Molecular Recognition in Irregular Linear and Macrocyclic Liquid-Crystalline Polyethers Based on 1-(4-Hydroxy-4’-Biphenylyl)-2-(4-Hydroxyphenyl) butane and α,ω-Dibromoalkanes

V. Percec, M. Kawasumi

Macromolecules Vol. 26 ( 15 ) page： 3917 - 3928 1993

Liquid-Crystalline Polyethers Based on Conformational Isomerism. 32. Effect of Molecular Weight on the Phase Behavior of Linear and Macrocyclic Oligoethers and of Linear Polyethers Based on 1-(4-Hydroxy-4’-biphenylyl)-2-(4-hydroxyphenyl) butane and 1,10-Dibromodecane

V. Percec, M. Kawasumi

Macromolecules Vol. 26 ( 14 ) page： 3663 - 3675 1993

Liquid Crystalline Polyethers Based on Conformational Isomerism. Part 28. Noncrystallizable Macrocyclics Exhibiting Enantiotropic Liquid-Crystalline Phases

V. Percec, M. Kawasumi

Chemistry of Materials Vol. 5 ( 6 ) page： 826 - 834 1993

機能性液晶高分子

川角昌弥

豊田中央研究所R&D レビュー Vol. 28 ( 4 ) page： 13 - 24 1993

Mechanical Properties of Nylon 6-Clay Hybrid Reviewed

Yoshitsugu Kojima, Arimitsu Usuki, Masaya Kawasumi, Akane Okada, Yoshiaki Fukushima, Toshio Kurauchi, Osami Kamigaito

Journal of Materials Research Vol. 8 ( 5 ) page： 1185 - 1189 1993

Synthesis of Nylon 6-Clay Hybrid Reviewed

Arimitsu Usuki, Yoshitsugu Kojima, Masaya Kawasumi, Akane Okada, Yoshiaki Fukushima, Toshio Kurauchi, Osami Kamigaito

Journal of Materials Research Vol. 8 ( 5 ) page： 1179 - 1184 1993

Swelling Behavior of Montmorillonite Cation Exchanged for ω-Amino Acids by ε-Caprolactam

Arimitsu Usuki, Masaya Kawasumi, Yoshitsugu Kojima, Akane Okada, Toshio Kurauchi, Osami Kamigaito

Journal of Materials Research Vol. 8 ( 5 ) page： 1174 - 1178 1993

Macrocycles with Clearing Temperatures Higher than Their Linear High-Molecular-Weight Homologues

V. Percec, M. Kawasumi

Journal of Materials Chemistry Vol. 3 ( 7 ) page： 725 - 734 1993

Similarities and Differences between the Mesomorphic Behavior of Oligomeric Macrocyclics and of Linear High Relative Molecular Mass Polyethers Based on 1-(4’-Hydroxybiphenyl-4-yl)-2-(4-Hydroxyphenyl) butane and Flexible Spacers

V. Percec, M. Kawasumi

Journal of the Chemical Society, Perkin Transactions Vol. 1 ( 12 ) page： 1319 - 1334 1993

Transformation of a Kinetically Controlled Nematic Phase of a Linear Polymer into One Which Is Thermodynamically Controlled via Cyclization

V. Percec, M. Kawasumi

Liquid Crystals Vol. 13 ( 1 ) page： 83 - 94 1993

Dynamic Light Scattering from Nematic Monodomains Containing Mesogenic Polymers of Differing Architectures

G. Dongfeng, A. M. Jamieson, M. Kawasumi, M. S. Lee, V. Percec

Macromolecules Vol. 25 ( 8 ) page： 2151 - 2155 1992

Synthesis and Characterization of a Thermotropic Nematic Liquid Crystalline Dendrimeric Polymer

V. Percec, M. Kawasumi

Advanced Materials Vol. 4 ( 9 ) page： 572 - 576 1992

Synthesis and Characterization of Cyclic Liquid Crystalline Oligomers Based on 1-(4-Hydroxy-4’-Biphenylyl)-2-(4-Hydroxyphenyl) butane and 1,10-Dibromodecane Reviewed

V.　Percec, M. Kawasumi, P. L. Rinaldi, V. E. Litman

Macromolecules Vol. 25 ( 15 ) page： 3851 - 3861 1992

Light Scattering from a Nematic Monodomain in an Electric Field Twist Elastic Constant and Viscosity Coefficient of Nematic Polymer–Solvent Mixtures

D. F. Gu, A. M. Jamieson, M. S. Lee, M. Kawasumi, V. Percec

Liquid Crystals Vol. 12 ( 6 ) page： 961 - 971 1992

Liquid-Crystalline Polyethers Based on Conformational Isomerism. 18. Polyethers Based on a Combined Mesogenic Unit Containing Rigid and Flexible Groups: 1-(4-Hydroxy-4’-Biphenyl)-2-(4-Hydroxyphenyl) butane

V. Percec, M. Kawasumi

Macromolecules Vol. 24 ( 23 ) page： 6318 - 6324 1991

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Papers - KAWASUMI Masaya