Liquid Crystalline Phosphazenes Bearing Biphenyl Mesogenic Groups

Harry R. Allcock, Chulhee Kim

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77 Scopus citations

Abstract

New thermotropic liquid crystalline phosphazene cyclic trimers and high polymers have been prepared by the incorporation of biphenyl derivative units connected to the skeleton by oligomeric ethyl- eneoxy spacer units. The cyclic trimer [NP|0(CH2CH2O)2C6H4C6H4CN}2]3 showed monotropic nematic schlieren texture between 102 and 59 °C. The phosphazene cyclic trimers and high polymers [NP{O-(CH2CH2O)3C6H4C6H4R}2]3 andn, where R = OMe, OEt, OPr-n, OPr-i, and OBu-n, have been synthesized. None of these cyclic trimers were liquid crystalline, but all the polymers showed enantiotropic liquid crystallinity.

Original languageEnglish (US)
Pages (from-to)3881-3887
Number of pages7
JournalMacromolecules
Volume23
Issue number17
DOIs
StatePublished - Jan 1 1990

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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