Molecular Engineering of Liquid Crystalline Polymers by Living Polymerization. 8. Influence of Molecular Weight on the Phase Behavior pf Poly(Omega-((4-cyano-4'Biphenyl)oxy)alkyl Vinyl Ether)s with Ethyl, Propyl and Butyl Alkyl Groups

Abstract

Our investigations on the polymerization of mesogenic vinyl ethers are performed with the initiating system CF3SO3H/(CH3)2S which induces a living polymerization at 0C in methylene chloride. Presently, we are performing experiments which provide a complete understanding of the influence of molecular weight on the phase behavior of poly omega-(4-cyano-4'-biphenyl)oxyalkyl vinyl ether s with flexible spacers containing from two to eleven methylene units. This paper will describe our results on the influence of molecular weight on the behavior of poly 2-4-cyano-4'-biphenyl)oxyethyl vinyl ether (6-2), poly 3-4- cyano-4'-biphenyl)oxypropyl vinyl ether (6-3) and poly 4-4-cyano-4'-biphenyl) oxybutyl vinyl ether (6-4). Their phase behavior will be compared to that of the model compounds of their monomeric structural units. (TTL)

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Document Details

Document Type
Technical Report
Publication Date
Oct 16, 1990
Accession Number
ADA229770

Entities

People

  • Myongsoo Lee
  • Virgil Percec

Organizations

  • Case Western Reserve University

Tags

Communities of Interest

  • C4I

DTIC Thesaurus Topics

  • Alcohols
  • Alkenes
  • Chemical Synthesis
  • Chemistry
  • Chlorides
  • Column Chromatography
  • Crystal Structure
  • Ethers
  • Glass Transition Temperature
  • Liquid Chromatography
  • Liquid Crystal Polymers
  • Liquid Crystals
  • Macromolecules
  • Magnesium Compounds
  • Phase Transformations
  • Polymers
  • Transition Temperature

Fields of Study

  • Chemistry

Readers

  • Polymer Science and Technology