Article
  • Viscoelasticity and Birefringence of Amorphous Polyarylates I
  • Hwang EJ, Inoue T, Osaki K
  • 무정형 폴리아릴레이트의 점탄성과 복굴절Ⅰ
  • 황의정, Inoue T, Osaki K
Abstract
The complex Young's modulus, E*, and the complex strain-optical coefficient, O*, of a conventional amorphous polyarylate were studied around the glassy-to-rubber transition zone. Measurement were performed over the frequency range of 1 to 130 Hz at various temperature between 205℃ and 255℃ and the master cures were constructed with the time-temperature superposition principle. The E* of polyarylate showed typical relaxation behavior of amorphous polymers. The rubbery plateau modulus, EN'=11.2MPa, was higher than the value of common amorphous polymers. The O* of polyarylate was positive over the whole reduced frequency range. A modified stress-optical rule(M-SOR) proposed previously was applied; by comparing E* with O*, the E* could be separated into two component functions, ER* and EG* and they allowed the consideration of relaxation mechanism responsible for the complex modulus. The stress-optical coefficients, CR and CG, corresponding to ER* and EG* were 6.8×10-9 Pa-1 and 2.0×10-11Pa-1, respectively. The temperature dependence of the shift factors used in constructing master curves of E*, O*, ER* and EG* was discussed.

무정형 폴리아릴레이트에 대해, 고무상 영역에서 유리상 영역에 걸쳐 동적 탄성율, E* 및 동적스트레인-광탄성 계수, O*를 측정하여 고찰하였다. 측정은 205℃에서 255℃ 사이의 여러 온도에 대해, 주파수를 1∼130 Hz로 변화시키며 행하였고, 시간-온도 환산칙을 적용하여 E*, O*의 마스타 곡선을 합성하였다. 구성한 두 특성치의 주파수 스펙트럼에 대해, 이전에 우리가 제안한 수정 응력-광탄성칙을 적용하여 고찰하였다. 폴리아릴레이트의 동적 탄성율 E*는 전형적인 무정형 고분자의 특성을 보였으며, 고무 평단 영역의 탄성율, EN'이 다른 고분자에 비해 매우 큰 11.2MPa을 나타냈다. 동적 스트레인-광탄성 계수 O*는, 페닐기가 측쇄로 존재하는 고분자들에 비해 매우 억제된 주파수 의존성을 보였다. 또한 측정된 전 영역에서 양의 값을 보였다. 수정 응력-광탄성칙에 의해 구한 폴리아릴레이트의 응력-광탄성 계수, CR, CG는 각각 6.8×10-9Pa-1과 2.0×10-11Pa-1을 나타냈다. 결정된 광탄성 계수를 이용하여, 측정한 영역에서의 동적 탄성율 E*를, 성분 탄성율 ER*, EG*로 분리하여, 각탄성율의 발생기구에 대해 고찰하였다. 또한 마스타 곡선 합성시 사용한 각 특성치의 환산이동인자의 온도 의존성에 대해서도 고찰하였다.

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
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This Article

  • 1993; 17(3): 249-259

    Published online May 25, 1993