Synthesis and Properties of Liquid Crystalline Copolyesters in Different Comonomer Sequences(I)

단위체 서열이 다른 액정 코폴리에스테르의 합성 및 특성(I)

  • 조철형 (조선대학교 공과대학 화학공학과) ;
  • 김선일 (조선대학교 공과대학 화학공학과) ;
  • 박기주 (조선대학교 공과대학 고분자공학과) ;
  • 최재곤 (조선대학교 공과대학 고분자공학과) ;
  • 최수경 (조선대학교 공과대학 화학공학과) ;
  • 조병욱 (조선대학교 공과대학 화학공학과)
  • Received : 1994.07.14
  • Accepted : 1994.09.14
  • Published : 1994.12.01

Abstract

Copolyeters consisted of p-oxybenzoly, naphthalene isomer and dimethyldisiloxyl group in different comonomer sequences were synthesized by solution polycondensation and characterized. The naphthalene isomers used in this study were of the 1,4 1,5, 2,6 and 2,7 naphthylene units. The inherent viscosities of the polymers were between 0.27~0.42dl/g and all of the polymers, with the exception of the 2,7-ordered copolyester, showed enantiotropic nematic behavior. Annealing the copolyesters resulted in increasing molecular weights and degree of crystallinity of crystallizable compositions. Ordered copolyesters exhibit significant differences in thermal transitions, thermal stability, crystalline properties and liquid crystallinity when compared with the properties of the corresponding radom copolyesters.

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Acknowledgement

Supported by : 교육부, 조선대학교