Rubbing-induced Molecular Alignment on a Rubbed Alkyl-Branched Polyimide Film

Jung Y. Huang; J. S. Li; S. H. Chen

doi:10.1080/10587259508031017

Rubbing-induced Molecular Alignment on a Rubbed Alkyl-Branched Polyimide Film

Jung Y. Huang, J. S. Li, S. H. Chen

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	77-84
Number of pages	8
Journal	Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
Volume	270
Issue number	1
DOIs	https://doi.org/10.1080/10587259508031017
State	Published - 1 Aug 1995

Keywords

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

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AB - 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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