Reversible Alignment Change of Nematic Liquid Crystals by Photochromic Polymer Films

被引：20

作者：

Kawanishi, Yuji ^{[1
]}

Seki, Takahiro ^{[1
]}

Tamaki, Takashi ^{[1
]}

Ichimura, Kunihiro ^{[1
]}

Ikeda, Mitsuhiro ^{[2
]}

Aoki, Koso ^{[3
]}

机构：

[1] Res Inst Polymers & Text, 1-1-4 Higashi, Tsukuba, Ibaraki 305, Japan

[2] Mitsubishi Paper Mills Ltd, Tsukuba Res Lab, Tsukuba, Ibaraki 305, Japan

[3] Toda Kogyo Corp, Naka Ku, Hiroshima 730, Japan

来源：

POLYMERS FOR ADVANCED TECHNOLOGIES | 1990年 / 1卷 / 5-6期

关键词：

Liquid crystal (LC); Photoresponsive polymer; Photochromic reaction; Molecular alignment; Photorecording;

D O I：

10.1002/pat.1990.220010505

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The alignment of a nematic liquid cystal (LC) was changed reversibly by a photochromic reaction of vinyl-polymer films bearing azobenzene (Az)chromophores. Photoisomerization of Az in the polymer films proceeded slower than in solution systems with an irreversible nature, due to a limited free volume of polymers and the presence of Az aggregates. Photoregulative Az films were obtained by two procedures: (i) spin-coating followed by baking processes; and (ii) adsorption from a LC/polymer mixture onto a lecithin-coated glass surface. Perpendicular alignment, which is achieved both in the surface Az and in the LC layer, allows a parallel interaction between them and enables the photoregulation of the LC alignment.

引用

页码：311 / 318

页数：8

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