Synthesis and Characterization of Liquid Crystalline Polysiloxanes Containing Benzyl Ether Mesogens.

Abstract

Side chain liquid crystalline polysiloxanes were synthesized by the hydrosilation of poly(methylhydrosiloxane) with p-(1-undecenyl-11-oxy) benzyl ethers of: 4-cyanophenol (IM), 4-methoxyphenol (IIM), 4-cyano-4'-hydroxybiphenyl (IIIM), 4-methoxy-4'-hydroxybiphenyl (IVM) and 2-cyano-6-hydroxynaphthalene (VM). The phase behavior of both monomeric and polymeric liquid crystals was characterized by differential scanning calorimetry and optical polarization microscopy. IM is a monotropic liquid crystal, IIM is crystalline, IIIM and IVM are enantiotropic liquid crystals, while VM presents two virtual liquid crystalline transitions and crystalline polymorphism. All the synthesized polysiloxanes present enantiotropic smectic mesomorphism.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1986
Accession Number
ADA175128

Entities

People

  • C. S. Hsu
  • Virgil Percec

Organizations

  • Case Western Reserve University

Tags

DTIC Thesaurus Topics

  • Alcohols
  • Alkanes
  • Chemical Synthesis
  • Chemistry
  • Chlorides
  • Crystallization
  • Crystals
  • Ethers
  • Glass Transition Temperature
  • Liquid Crystals
  • Microscopy
  • Military Research
  • Molecular Weight
  • Organic Chemistry
  • Procurement
  • Transition Temperature
  • Transitions

Fields of Study

  • Chemistry

Readers

  • Polymer Science and Technology