The Effect of the Polymer Backbone on the Thermotropic Behavior of Side-Chain Liquid Crystalline Polymers

Abstract

Poly(ephichlorohydrin) (PECH) and poly(2,.6-dimethyl-1,4-phenylene oxide) (PPO) containing pendant mesogenic units separated from the main chain through spacers of zero to ten methylene units were synthesized and characterized in order to test the 'spacer concept'. Both polymers were modified by phase transfer catalyzed esterifications of the chloromethyl groups (PECH) or the bromobenzyl groups (brominated PPO) with potassium omega-(4-oxybiphenyl) alkanoates and potassium omega-(4-methoxy-4'-oxybiphenyl)-alkanoates. While PPO required ten methylene units as spacer and 4,4'-methoxybiphenyl as mesogen to present thermotropic liquid mesomorphism, PECH required no spacer. Keywords: Side-chain thermotropic liquid crystalline polymers.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1986
Accession Number
ADA175087

Entities

People

  • Coleen Pugh
  • Virgil Percec

Organizations

  • Case Western Reserve University

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DTIC Thesaurus Topics

  • Biphenyl
  • Copolymers
  • Glass Transition Temperature
  • Governments
  • Heat Energy
  • Macromolecules
  • Military Research
  • Molecular Weight
  • Molecules
  • Oligomers
  • Phase
  • Phase Transformations
  • Polymers
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  • Resilience
  • Transition Temperature
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Fields of Study

  • Chemistry

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  • Polymer Science and Technology