Rubbing-induced molecular alignment on a rubbed alkyl-branched polyimide film

被引：3

作者：

Huang, JY

Li, JS

Chen, SH

机构：

[1] Institute of Electro-Optical Engineering, Chiao Tung University, Hsinchu

来源：

MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 1995年 / 270卷

关键词：

liquid crystal; polyimide; alkyl-branched; phase retardation; pretilt angle; atomic force microscopy; optical second-harmonic generation;

D O I：

10.1080/10587259508031017

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Rubbing-induced molecular alignment on an alkyl-branched polyimide film with varying unidirectional rubbing strength has been investigated with the use of optical phase retardation measurement, atomic force microscopy (AFM), and second-harmonic generation (SHG). Our AFM images suggest that the rubbing-induced micro-groove should play a minor role in aligning liquid crystal (LC) molecules. The polar angle of the polar head group of a LC monolayer on an alkyl-branched polyimide film was found to vary with the rubbing strength. The results obtained from various experimental techniques can be reconciled with a simple molecular model proposed in this paper.

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页码：77 / &

页数：9

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