Solidification of a main-chain liquid-crystal polymer: Effects of electric fields, surfaces and mesophase ageing

P. G. Martin*, S. I. Stupp

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Solid films of the liquid-crystal polycondensate of 80mol% p-acetoxybenzoic acid and 20mol% poly(ethylene terephthalate) were probed by exposures to controlled surfaces and electric fields and analysed by differential scanning calorimetry and X-ray diffraction. Films can develop some preferred backbone orientation after isothermal ageing of the mesophase and resolidification as a result of surface topography on confining walls. Mesophase ageing also results in solid films with greater structural order. Preferred backbone orientation is enhanced when solid films are heated to the liquid-crystalline state in an electric field and then resolidified. This is thought to result from the coupled effect of a pre-existing molecular field and dielectric alignment of the mesogenic chains. Interchain dipolar coupling and a biaxial nematic structure should be considered further as possible structural elements in these polymers.

Original languageEnglish (US)
Pages (from-to)897-906
Number of pages10
JournalPolymer
Volume28
Issue number6
DOIs
StatePublished - May 1987

Keywords

  • electric field
  • liquid-crystal polymer
  • mesophase
  • mesophase ageing
  • surface

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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