研究者詳細 - 川角　昌弥

論文 - 川角　昌弥

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Novel memory effect found in nematic liquid crystal clay mineral composites 査読有り国際誌

Kawasumi M, Hasegawa N, Usuki A, Okada A, Kurauchi T

LIQUID CRYSTALS FOR ADVANCED TECHNOLOGIES 425 巻頁： 311 - 316 1996年

Reversible electro-optical switching of a memory type pdlc memory using two-frequency-addressing liquid crystals memory on- state ii 国際誌

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

Liquid Crystals 21 巻 ( 5 ) 頁： 765 - 766 1996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：Liquid Crystals

A memory type PDLC has been prepared by sandwiching a mixture of two-frequencyaddressing liquid crystals and acrylate monomers with a hydoroxy group between two glass substrates with IT0 electrodes followed by UV irradiation. This PDLC can be electrically switched between a transparent state and a light scattering state, which are maintained over several months without electric fields. © 2006 Taylor & Francis.

DOI： 10.1080/02678299608032890

Web of Science

Scopus

ナイロン6-粘土ハイブリッドの分子構造

臼杵有光, 川角昌弥, 小島由継, 岡田茜, 倉内紀雄, 小川忠男, 荒賀年美

高分子論文集 52 巻 ( 5 ) 頁： 299-304 1995年5月

Novel preferred orientation in injection‐molded nylon 6‐clay hybrid

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

Journal of Polymer Science Part B: Polymer Physics 33 巻 ( 7 ) 頁： 1039 - 1045 1995年5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：Journal of Polymer Science Part B: Polymer Physics

Nylon 6‐clay hybrid (NCH) is a molecular composite of Nylon 6 and uniformly dispersed silicate monolayers of montmorillonite. In this study the preferred orientation of montmorillonite and Nylon‐6 crystallites in a thick (3 mm) injection‐molded bar of NCH has been investigated using x‐ray diffraction and electron micrography (TEM). It is clear that this bar has a triple layer structure consisting of surface, intermediate, and middle layers which have different preferred orientation. In the surface layer both the silicate monolayers and the chain axes of Nylon‐6 crystallites are parallel to the bar surface though the latter are randomly oriented within the plane. In the intermediate layer the silicate monolayers remain parallel to the bar surface but the Nylon‐6 crystallites rotate by 90° so that the chain axes would be perpendicular to the bar surface or the silicate monolayers. In the middle layer the silicate monolayers are randomly oriented around the flow axis of the NCH bar while remaining parallel to it, and the Nylon crystallites are randomly oriented around the flow axis while keeping their chain axes perpendicular to the silicate monolayers. It may be concluded that such preferred orientation of Nylon 6 crystallites is induced by the clay because the crystallites in the pure Nylon 6 bar have no preferred orientation. ©1995 John Wiley & Sons, Inc. Copyright © 1995 John Wiley & Sons, Inc.

DOI： 10.1002/polb.1995.090330707

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Interaction of nylon 6‐clay surface and mechanical properties of nylon 6‐clay hybrid

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

Journal of Applied Polymer Science 55 巻 ( 1 ) 頁： 119 - 123 1995年1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：Journal of Applied Polymer Science

We synthesized nylon 6‐clay hybrid materials using four types of clay minerals, montmorillonite, saponite, hectrite, and synthetic mica. The mechanical properties of their injection molded specimens were measured according to ASTM. Nylon 6‐clay hybrid using montmorillonite was superior to the other hybrids in mechanical properties. This might result from the difference in the interaction between nylon molecules and silicates in the hybrids. To clarify this hypothesis, we synthesized intercalated compounds of the clay minerals with glycine as the model of the hybrids, and analyzed the interaction using 15N cross polarization magic angle spinning (CP/MAS) NMR spectroscopy. The 15N‐NMR result reveals that the positive charge density on the nitrogen of the intercalated compound based on montmorillonite was largest in all the intercalated compounds. It was suggested that montmorillonite interacted strongly with nylon 6 by ionic interaction. This ionic interaction was one of the reasons why these hybrid materials had superior mechanical properties. © 1995 John Wiley & Sons, Inc. Copyright © 1995 John Wiley & Sons, Inc.

DOI： 10.1002/app.1995.070550113

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Scopus

環状および樹状構造を有する液晶高分子

川角昌弥

高分子 44 巻 ( 7 ) 頁： 448 - 448 1995年

Viscoelastic Properties of Dilute Nematic Mixtures Containing Cyclic and Hyperbranched Liquid Crystal Polymers Dissolved in a Nematic Solvent

Fu‐Lung ‐L Chen, A. M. Jamieson, M. Kawasumi, V. Percec

Journal of Polymer Science Part B: Polymer Physics 33 巻 ( 8 ) 頁： 1213 - 1223 1995年

Conformational Behavior of the Spacer in a Liquid Crystalline Main-Chain Polymer in Its Nematic and Glassy States

J. Leisen, C. Boeffel, H. W. Spiess, D. Y. Yoon, M. H. Sherwood, M. Kawasumi, V. Percec

Macromolecules 28 巻 ( 20 ) 頁： 6937 - 6941 1995年

SANS Study of a Semiflexible Main Chain Liquid Crystalline Polyether

F. Hardouin, G. Sigaud, M. F. Achard, A. BrÛlet, J. P. Cotton, D. Y. Yoon, V. Percec, M. Kawasumi

Macromolecules 28 巻 ( 16 ) 頁： 5427 - 5433 1995年

ジアミン変性ナイロン６‐粘土ハイブリッドの合成と特性

臼杵有光, 川角昌弥, 小島由継, 岡田茜, 倉内紀雄

高分子論文集 52 巻 ( 7 ) 頁： 440 - 444 1995年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人高分子学会

今までに, 12-アミノラウリン酸で有機化した粘土を用い, その層間でカプロラクタムを重合し, 粘土のシリケート層が1層ごとはく離して均一に分散したナイロン6-粘土ハイブリッド (NCH) を合成した. 今回, NCHの重合時に, ジアミンを添加することにより, ナイロン6中にシリケート層が数層積層して分散した新しいハイブリッド材料が合成できた. これをジァミン変性NCHと呼ぶ. ジァミン変性NCHの力学的性質は従来のNCHに比べ, 強度, 弾性率はやや低下するが, 伸びと衝撃強度が大幅に向上した. これはNCHの合成時に, 粘土のシリケート層が, ジアミンから生成したジアンモニウムイオンで架橋して積層し, この状態でナイロン6中に分散したためと考えられる. そのためジアミン変性NCHでは, シリケート層とナイロン6の界面が減少し, 双方のイオン相互作用が低下することにより, ハイブリッド材料の強度, 弾性率が低下したと考察した.

DOI： 10.1295/koron.52.440

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CiNii Research

Molecular Structure of Nylon in Nylon 6-Clay Hybrid

Usuki A., Kawasumi M., Kojima Y., Okada A., Kurauchi T., Ogawa T., Raga T.A.

KOBUNSHI RONBUNSHU 52 巻 ( 5 ) 頁： 299 - 304 1995年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：KOBUNSHI RONBUNSHU

The molecular structure of nylon in nylon 6-clay hybrid (NCH), in which clay silicates were dispersed uniformly, was analyzed using a field desorption mass spectrometer. The main peaks of fragment ions from the mass spectrum of NCH, were classified into ion groups. Two possible molecular structures of NCH were postulated supposing different locations of the copolymerized nylon 12 monomer unit (12-aminolauric acid) which was intercalated in the clay prior to the polymerization to enhance the miscibility between the clay and nylon 6. We compared the experimental fragment ion groups with those from the expected structures. From these results, it became clear that nylon 12 monomer units did not exist only at the end of nylon 6, but also occur randomly along the nylon 6 main chain. NCH without having any 12-aminolauric acid units was proved to have improved thermal properties. © 1995, The Society of Polymer Science, Japan. All rights reserved.

DOI： 10.1295/koron.52.299

Scopus

CiNii Research

FINE-STRUCTURE OF NYLON-6-CLAY HYBRID 査読有り国際誌

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

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS 32 巻 ( 4 ) 頁： 625 - 630 1994年3月

Molecular Recognition Directed Self-Assembly of Supramolecular Architectures

V. Percec, J. Heck, G. Johansson, D. Tomazos, M. Kawasumi, P. Chu, G. Ungar

Journal of Macromolecular Science, Part A 31 巻 ( 11 ) 頁： 1719 - 1758 1994年

Molecular Order in the Nematic Melt of a Semiflexible Polyether by Deuteron NMR

M. H. Sherwood, G. Sigaud, D. Y. Yoon, C. G. Wade, M. Kawasumi, V. Percec

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 254 巻 ( 1 ) 頁： 455 - 468 1994年

At the Borderline Between Glassy, Crystalline and Liquid Crystalline Macrocyclics

V. Percec, M. Kawasumi

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 238 巻 ( 1 ) 頁： 21 - 37 1994年

Toward ‘Willowlike’ Thermotropic Dendrimers 査読有り

V. Percec, P. Chu, M. Kawasumi

Macromolecules 27 巻 ( 16 ) 頁： 4441 - 4453 1994年

Molecular Recognition Directed Self-Assembly of Supramolecular Liquid Crystals

V. Percec, J. Heck, G. Johansson, D. Tomazos, M. Kawasumi, P. Chu, G. Ungar

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 254 巻 ( 1 ) 頁： 137 - 196 1994年

SORPTION OF WATER IN NYLON-6 CLAY HYBRID

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

JOURNAL OF APPLIED POLYMER SCIENCE 49 巻 ( 7 ) 頁： 1259 - 1264 1993年8月

One‐pot synthesis of nylon 6–clay hybrid 国際誌

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

Journal of Polymer Science Part A: Polymer Chemistry 31 巻 ( 7 ) 頁： 1755 - 1758 1993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：Journal of Polymer Science Part A: Polymer Chemistry

Nylon 6–clay hybrid is a molecular composite of nylon 6 and uniformly dispersed silicate layers of montmorillonite. One‐pot synthesis of the hybrid was carried out by the following procedures. Montmorillonite was dispersed in water, and then ε‐caprolactam, acid (phosphoric acid, hydrochloric acid, benzenesulfonic acid, isophthalic acid, trichloroacetic acid, or acetic acid), and 6‐aminocaproic acid were added to the dispersion. The mixtures were reacted at 260°C for 6 h, yielding the nylon 6–clay hybrids (1potNCHs). X‐ray diffraction revealed that the silicate layers of 1potNCH by phosphoric acid were uniformly dispersed in the nylon 6 matrix. The 1potNCH had excellent mechanical properties. The strength and the modulus of the hybrid increased compared with previously reported nylon 6–clay hybrid (NCH) synthesized by montmorillonite intercalated with 12‐aminolauric acid. The heat distortion temperature (HDT) of the 1potNCH was 160°C, which was 8°C higher than that of NCH. In other 1potNCHs, montmorillonite had a smaller effect on the increase of those properties, and interlayer spacing of montmorillonite was observed at ca. 20 Å. © 1993 John Wiley & Sons, Inc. Copyright © 1993 John Wiley & Sons, Inc.

DOI： 10.1002/pola.1993.080310714

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Scopus

MECHANICAL-PROPERTIES OF NYLON 6-CLAY HYBRID

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

JOURNAL OF MATERIALS RESEARCH 8 巻 ( 5 ) 頁： 1185 - 1189 1993年5月

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