Article
  • Structure Analysis of the Thermotropic Liquid Crystalline Copolyester
  • Hong SK
  • 열방성 액정폴리에스테르의 구조 해석
  • 홍성권
Abstract
The structure of the thermotropic copolyester, poly(phenyl-p-phenylene-terephthalate) in the as-spun state, has been studied by X-ray diffraction techniques and molecular modelling. Poly(TPA-PHQ) in the as-spun state, prepared from terephthaloyl chloride(TPA) and phenylhydroquinone(PHQ), has a distorted structure somewhere between the nematic and highly crystalline state. Cylindrically averaged Fourier transform of a single chain has been calculated and the effect of chain conformation on the intensity transform has been studied for the complete random and rigid chain models. The interference effect that occur when chains are packed has also been considered with the release of perfect axial register by introducing a normal distribution function, with standard deviation σ. Thus it has been shown that the diffraction characteristics which we associate with the crystallinity can be generated with the introduction of minimal axial register.

열방성 액정폴리에스터, poly(phenyl-p-phenylene-terephthalate)의 as-spun 상태에서의 구조를 X-선 회절 및 분자모델링 방법을 이용하여 해석하였다. Terephthaloyl chloride(TPA)와 Phenylh-ydroquinone(PHQ)으로부터 합성된 poly(TPA-PHQ)의 as-spun 상태에서의 X-선 회절 구조는 nematic상태와 3차원 결정상태(crystalline)의 중간쯤의 뒤틀린(distorted) 상태의 구조를 나타내었다. 구조 해석을 위해서는 먼저 single chain의 X-선 회절강도를 cylindricall averaged Fourier transform에 의해 계산하였으며 chain conformation에 의한 효과를 random 상태와 rigid 상태의 chain model에 대해 각자 적용하여 비교하였다. 한편, chain들이 packing 될때 일어나는 interchain interference 효과는 각 chain들의 주축상의 분포를 평균편차를 가진 정규분포함수 개념을 적용하여 고려하였으며 결국, 이들이 구조의 결정화(crystallinity) 정도에 미치는 영향을 chain들의 주축간 분포정도와 관련지어 모형화 할 수 있었으며. 피러한 주축강의 chain들의 규칙적 분포정도(axial register)의 조절을 동한 현구조의 모형화가 가능함을 보여주었다.

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  • 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

  • 1992; 16(1): 105-114

    Published online Jan 25, 1992