Thermal properties of liquid crystalline polyurethanes obtained from an asymmetric mesogenic diol

DOI

Bibliographic Information

Other Title
  • 非対称性メソゲンジオールから得られる液晶ポリウレタンの熱的性質

Abstract

Novel main-chain liquid crystal polyurethanes were synthesized by the polyaddition of an asymmetric mesogenic diol and diisocyanates. The asymmetric mesogenic diol (MD62), 1-hydroxy-6-(4-(4-(2-(hydroxy)ethyl)phenylazo)phenoxy)hexane, was synthesized by a combination of an azo coupling method and the Williamson ether synthesis. Tolylene-2,4-diisocyanate (TDI), 1,3-bis(isocyanatomethyl)cyclohexane (13CH), 1,3-bis(isocyanatomethyl)benzene (13X) and 1,6-diisocyanatohexane (16H) were used as diisocyanates. The liquid crystalline polyurethane (PU62-TDI) obtained from MD62 and TDI formed a nematic phase on heating and cooling processes. PU62-TDI exhibited glass-nematic and nematic-isotropic phase transition. The liquid crystalline polyurethane (PU62-13CH) synthesized from 13CH instead of TDI also formed the nematic phase and revealed the same phase behavior. By a variable-temperature IR spectroscopy, hydrogen bonds between the urethane units are linked to the phase transitions of the liquid crystalline polyurethane.

Journal

Details 詳細情報について

  • CRID
    1390857669058561792
  • DOI
    10.11425/sst.11.157
  • ISSN
    21871590
    21864942
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Disallowed

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