Article
  • Properties of Thermotropic Liquid Crystalline Polyesters and Blends Based on Dihydroxybiphenyl
  • Kim DJ, Kim SC
  • Dihydroxybiphenyl계 열방성 액정 폴리에스테르 및 블렌드의 물성에 관한 연구
  • 김덕준, 김성철
Abstract
Nematic and smectic liquid crystalline polymers were prepared by reacting 4,4''-dihydroxybiphenyl and dibaic acids having 7 and 8 methylene units. 4 series of blends were also obtained from the azelaic and sebacic polyesters. The mesophases formed at elevated temperature were studied by the differential scanning calorimetry and the polarized optical microscope. Complex phase diagrams show coexisting nematic and smectic phase. The thermal and mechanical properties of the blends of polycarbonate and the nematic liquid crystalline polymer were also studied.

4,4''-dihydroxybiphenyl과 메틸렌기가 7개인 azelaic acid와 8개인 sebacic acid의 중합반응으로 네메틱과 스멕틱의 열방성 폴리에스테르를 합성하고 두 호모 폴리에스테르의 조성비를 변화시켜 블렌드를 제조하였다. 온도변화에 따른 액정상을 DSC와 편광현미경을 이용하여 관찰한 결과 네메틱과 스멕틱이 공존하는 상의 형성을 보이는 상도(phase diagram)을 얻어내었다. 또한 폴리카르보네이트와 네메틱 액정 폴리에스테르의 블렌드를 제조하여 열 및 기계적 물성의 변화를 알아보았다.

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1988; 12(5): 410-417

    Published online Aug 25, 1988