Pressure-Induced Phases in a Thermotropic Polyester.

Abstract

Studies of a copolyester of 20% hydroxybenzoic acid, 40% isophthalic acid and 40% hydroquinone, a mesomorphic polymer, were carried out under pressure. The phase behavior was characterized by the x-ray diffraction, thermal analysis and high pressure DTA techniques. It was found that pressure induced a new crystal habit in the solid and a new mesophase in this polymer. All thermal transitions have been summarized in a proposed phase diagram. The finding of pressure induced mesomorphism confirms the possibility of extending the range of polymers which might exhibit liquid crystallinity. Keywords: thermotropic Liquid Crystal Polyester, Thermal Analysis, Pressure induced, Mesomorphism.

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Document Details

Document Type
Technical Report
Publication Date
Jul 30, 1987
Accession Number
ADA183424

Entities

People

  • B. S. Hsiao
  • E. T. Samulski
  • M. T. Shaw

Organizations

  • University of Connecticut

Tags

Communities of Interest

  • Counter IED
  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemistry
  • Connecticut
  • Crystal Structure
  • Diagrams
  • High Pressure
  • Improvised Explosive Devices
  • Liquid Crystal Polymers
  • Liquid Crystals
  • Materials
  • Materials Science
  • Military Research
  • Phase Diagrams
  • Polymers
  • Thermal Analysis
  • United States
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Chemistry

Readers

  • Materials Science and Engineering.
  • Polymer Science and Technology