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Multi-Layers Thin Films of Acetalized Poly(Vinyl Alcohol) Derivatives Obtained by the LB Method and Their Opto-Electronic Properties

Published online by Cambridge University Press:  21 February 2011

Kiyoshi Oguchi ,
Yasuhiko Yokoh ,
Kohei Sanui  and
Naoya Ogata
Kiyoshi Oguchi
Affiliation:
Central Research Institute, Dai Nippon Printing Co., Ltd., 1–1, Ichigaya-Kagacho 1-Chome, Shinjuku-ku, Tokyo 162 Japan
Yasuhiko Yokoh
Affiliation:
Chiba Laboratory, UBE Industries, Ltd., 8–1, Goi-minamikaigan, Ichihara City, Chiba 290 Japan
Kohei Sanui
Affiliation:
Department of Chemistry, Sophia University, 7–1 Kioi-cho, Chiyoda-ku, Tokyo 102 Japan
Naoya Ogata
Affiliation:
Department of Chemistry, Sophia University, 7–1 Kioi-cho, Chiyoda-ku, Tokyo 102 Japan
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Abstract

The formation of surface films of acetalized poly(vinyl alcohol)s at the air/water interface has been investigated in terms of the structure of the transferred films, after transfer of these surface films to solid substrates by means of the Langmuir-Blodgett technique. Furthermore, their electron beam exposure characteristics and non-linear optical properties were measured. It was found that the monolayers of acetalized poly(vinyl alcohol)s having aliphatic side chaines gave stable surface films with a limiting area of ca. 0.3nm2/average repeat unit, irrespective of the side-chain length and the degree of polymerization of the starting poly(vinyl alcohol). The surface films could be deposited onto various substrates with deposition ratios of 1.0. The resulting multilayers were Y type. The thickness of the multilayers was proportional to the number of layers, and the single-layer thickness increased with increasing sidechain length. The surface wettability of the multilayers changed alternatingly, depending on whether the number of layers was even or odd. These results indicated that the surface films were monolayers of polymers, with hydrophilic main chains spread over the air/water interface and hydrophobic side chains directed approximately normal to the interface. The transferred films maintained the oriented structure of the monolayers at the interface. The acetalized poly(vinyl alcohol)s prepared by the LB technique is adaptable as a high resolution negative-type EB resist. And the second harmonic generation (SHG) of some acetalized poly(vinyl alcohol)s was observed by LB method and by electric field poling method.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 175: Symposium S – Multifunctional Materials , 1989 , 277
Copyright
Copyright © Materials Research Society 1990

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