Molecular Engineering of Liquid Crystalline Polymers by Living Polymerization. 7. Influence of Copolymer Composition on the Phase Behavior pf Poly(11-((4-cyano-4'Biphenyl)oxy)undecanyl Vinyl Ether-co-2-((4-Cyano-4'- Biphenyl)oxy)ethyl Vinyl Ether)

Abstract

This paper describes the synthesis of poly 11-4-cyano-4 '-biphenyl) oxyundecanyl vinyl ether-co-2-(4-cyano-4'biphenyl)oxyethyl vinyl ether A/B poly(6-11)-co-(6-2)A/B where A/B refers to the molar ratio between the monomers 6-11 and 6-2, with number average molecular weights above 15, by living cationic polymerization. The phase behavior of the resulting copolymers was discussed as a function of copolymer composition. Within this range of molecular weights, in the first heating scan poly(6-11) exhibits a melting and an enantiotropic s(A) phase, while poly(6-2) only a glass transition temperature. Depending on composition, poly(6-11-CO6-2)A/B either display an enantiotropic nematic, enantiotropic s(A) or both enantiotropic nematic and anantiotropic s(A) phases.

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Document Details

Document Type
Technical Report
Publication Date
Oct 16, 1990
Accession Number
ADA229771

Entities

People

  • Myongsoo Lee
  • Virgil Percec

Organizations

  • Case Western Reserve University

Tags

DTIC Thesaurus Topics

  • Alkenes
  • Chlorides
  • Copolymers
  • Glass Transition Temperature
  • Liquid Crystal Polymers
  • Liquid Crystals
  • Macromolecules
  • Measurement
  • Military Research
  • Molecular Weight
  • Phase
  • Phase Transformations
  • Polymerization
  • Polymers
  • Smectic Phase
  • Transition Temperature
  • Transitions

Fields of Study

  • Chemistry
  • Materials science

Readers

  • Polymer Science and Technology

Technology Areas

  • Microelectronics