Investigation of the effect of an ether moiety on the liquid crystallinity by thin film polymerization

Si Xue Cheng, Tai-Shung Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The effect of an ether moiety on liquid crystallinity was determined by means of in situ thin film polymerization under a polarizing microscope with a heating stage. The polymerization system consists of p-acetoxybenzoic acid (ABA)/acetoxyacetanilide (AAA)/4,4′-oxybis(benzoic acid) (OBA). Because of the swivel structure introduced by the ether group in the OBA monomeric unit, there is a critical composition to form the mesogenic phase during the polymerization. Liquid crystallinity forms when the concentration of the OBA is lower than 25 mol-%. Surprisingly, both LC phase and crystalline phase appear simultaneously in the isotropic phase if the reaction system is at critical composition. In addition, we have observed the disclination strengths change from ±1 to ±1/2 with an increase in ether linkages in the polymerization systems where LC phases appear, which is quite different from the homopolymerization system containing rigid rod-like p-acetoxybenzoic acid (ABA) and other systems without ether linkages where their disclinations have strengths of ±1. Clearly, the chain structure not only determines the formation of liquid crystallinity but also affects the strength of disclinations and the annihilation process.

Original languageEnglish (US)
Pages (from-to)122-128
Number of pages7
JournalMacromolecular Chemistry and Physics
Volume203
Issue number1
DOIs
StatePublished - Jan 9 2002

Keywords

  • Liquid crystallinity
  • Liquid-crystalline polymers (LCP)
  • Polymerization
  • Thin films

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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