Faculty Profiles - KAWASUMI Masaya

Papers - KAWASUMI Masaya

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Study on water content of perfluorosulfonic acid ionomer membranes below water freezing point

A. Koiwai, A. Kamiya and M. Kawasumi

Vol. 11 ( 1 ) page： 587 - 587 2007.9

Degradation of Nafion Membranes in Hydrogen Peroxide

K. Kodama, F. Miura, N. Hasegawa, M Kawasumi and Y. Morimoto

ECS Meeting Abstracts Vol. MA2005-02 ( X2 - Durability and Reliability of Low-Temperature Fuel Cells and Fuel Cell Systems ) page： 1185 - 1185 2006

The discovery of polymer-clay hybrids

Kawasumi M

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY Vol. 42 ( 4 ) page： 819 - 824 2004.2

Cell performances of direct methanol fuel cells with grafted membranes

Hatanaka T, Hasegawa N, Kamiya A, Kawasumi M, Morimoto Y, Kawahara K

FUEL Vol. 81 ( 17 ) page： 2173 - 2176 2002.12

Polyolefin-clay hybrids based on modified polyolefins and organophilic clay

Hasegawa N., Okamoto H., Kawasumi M., Kato M., Tsukigase A., Usuki A.

Macromolecular Materials and Engineering Vol. 280-281 ( 7-8 ) page： 76 - 79 2000

Language：English Publishing type：Research paper (scientific journal) Publisher：Macromolecular Materials and Engineering

A novel and general approach to prepare polyolefin-clay hybrids by using the maleic anhydride modified polyolefins and organophilic clay during melt-blending was reported. The silicate layers of the clay were exfoliated and homogeneously dispersed at the monolayers in the hybrids. The hybrids exhibited remarkable reinforcement compared to conventional composites filled with talc which were dispersed at micrometer level.

DOI： 10.1002/1439-2054(20000801)280:1<76::aid-mame76>3.0.co;2-#

Web of Science

Scopus

Electro-Rheological Behavior of Liquid Crystal Polymers (LCPs) Dissolved in a Nematic Solvent: Dependence on Temperature and LCP Structure

Y.-C. Chiang, A. M. Jamieson, S. Campbell, T. H. Tong, N. D. Sidocky, L. C. Chien, M. Kawasumi, V. Percec

Polymer Vol. 41 ( 11 ) page： 4127 - 4135 2000

Preparation and mechanical properties of polystyrene-clay hybrids

Hasegawa N, Okamoto H, Kawasumi M, Usuki A

JOURNAL OF APPLIED POLYMER SCIENCE Vol. 74 ( 14 ) page： 3359 - 3364 1999.12

Preparation and mechanical properties of polystyrene-clay hybrids.

Hasegawa N, Okamoto H, Kawasumi M, Usuki A

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY Vol. 217 page： U411 - U411 1999.3

Liquid Crystal/Clay Mineral Composites

Masaya Kawasumi, Naoki Hasegawa, Arimitsu Usuki, Akane Okada

Applied Clay Science Vol. 15 ( 1-2 ) page： 93 - 108 1999

Nematic liquid crystal/clay mineral composites

Kawasumi M, Hasegawa N, Usuki A, Okada A

MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS Vol. 6 ( 2-3 ) page： 135 - 143 1998.11

Preparation and mechanical properties of polypropylene-clay hybrids using a maleic anhydride-modified polypropylene oligomer

Hasegawa N, Kawasumi M, Kato M, Usuki A, Okada A

JOURNAL OF APPLIED POLYMER SCIENCE Vol. 67 ( 1 ) page： 87 - 92 1998.1

Preparation and mechanical properties of polypropylene-clay hybrids

Kawasumi M, Hasegawa N, Kato M, Usuki A, Okada A

MACROMOLECULES Vol. 30 ( 20 ) page： 6333 - 6338 1997.10

Effect of Molecular Architecture on the Electrorheological Behavior of Liquid Crystal Polymers in Nematic Solvents

Y.-C. Chiang, A. M. Jamieson, S. Campbell, Y. Lin, N. O’Sidocky, L.-C. Chien, M. Kawasumi, V. Percec

Rheologica Acta Vol. 36 ( 5 ) page： 505 - 512 1997

Electrorheological Behavior of Main-Chain Liquid Crystal Polymers Dissolved in Nematic Solvents

Y.-C. Chiang, A. M. Jamieson, M. Kawasumi, V. Percec

Macromolecules Vol. 30 ( 7 ) page： 992 - 1996 1997

Novel memory effect found in nematic liquid crystal/ fine particle system

Kawasumi M., Hasegawa N., Usuki A., Okada A.

Liquid Crystals Vol. 21 ( 6 ) page： 769 - 776 1996

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

Novel liquid crystalline composites composed of a nematic two-frequency-addressing liquid crystal and organized clay mineral (about 1 wt %) have been prepared. The particles of clay mineral were dispersed homogeneously in the liquid crystal. The composite cells became transparent within 50ms when a 60 Hz electric field was applied. The transparent state was maintained after the field was switched off. It transformed into a turbid light scattering state by applying 1.5kHz electric field which caused dynamic scattering in the cell. The light transmittance of both memory states did not change after 20 h without the electric field. © 2006 Taylor & Francis.

DOI： 10.1080/02678299608032892

Web of Science

Scopus

Reversible Electro-optical Switching of Memory Type PDLC by Two-frequency-driving

HASEGAWA Naoki, KAWASUMI Masaya, USUKI Arimitsu, OKADA Akane

Preprints of symposium on liquid crystals Vol. 22 ( 0 ) page： 399 - 400 1996

Language：Japanese Publishing type：Research paper (conference, symposium, etc.) Publisher：The Japanese Liquid Crystal Society

A memory type PDLC have been prepared by sandwiching a mixture of two-frequency-addressing liquid crystals and acrylate monomers with hydoroxy group between two glass substrates with ITO electrodes followed by the UV irradiation. This PDLC can be electrically switched between the transparent state and the light scattering state, which are maintained over months without electric field. This PDLC exhibited a polymer ball morphology according to SEM observation.

DOI： 10.11538/ekitouyokou.22.0_399

CiNii Research

The Factors Affecting The Electro-optic Effect of Nematic Liquid Crystal / Fine Particles Composites System

KAWASUMI Masaya, HASEGAWA Naoki, USUKI Arimitsu, OKADA Akane

Preprints of symposium on liquid crystals Vol. 22 ( 0 ) page： 397 - 398 1996

Language：Japanese Publishing type：Research paper (conference, symposium, etc.) Publisher：The Japanese Liquid Crystal Society

The novel liquid crystalline composites cell based on a nematic two-frequency-driving liquid crystal and organized clay exhibited reversible and bistable electro-optic effects between the transparent and light scattering states. In this paper, the factors affecting the electro-optic effect of the composites were investigated. The wettability of the liquid crystal on the organized clay strongly affected to their memory capability. The memory effect decreased drastically with decreasing the clay content in the composites with clay content below 1 wt.%. Not only the composites themselves but also the treatment of the substrates affected to the electro-optic effect. The treatment for the homogeneous alignment gave the better memory effect for the transparent state.

DOI： 10.11538/ekitouyokou.22.0_397

CiNii Research

大学大学院における高分子教育

岡田守, 板垣秀幸, 伊藤浩一, 川上雄資, カートハウスオラフ, 川角昌弥, 金仁華

高分子 Vol. 45 ( 10 ) page： 729 - 735 1996

Liquid crystalline composite based on a clay mineral

Kawasumi M, Usuki A, Okada A, Kurauchi T

MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS Vol. 281 page： 91 - 103 1996

Reversible Electro-Optical Switching of a Memory Type PDLC Memory Using Two-Frequency-Addressing Liquid Crystals

Naoki Hasegawa, Masaya Kawasumi, Arimitsu Usuki, Akane Okada

Liquid Crystals Vol. 21 ( 5 ) page： 765 - 766 1996

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Papers - KAWASUMI Masaya