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

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

Research output: Contribution to journalArticlepeer-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 languageEnglish
Pages (from-to)77-84
Number of pages8
JournalMolecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
Volume270
Issue number1
DOIs
StatePublished - 1 Aug 1995

Keywords

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

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