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Poly(ether imide)와 열방성 액정 고분자 블렌드의 물성
Physical Properties of Blends of Poly(ether imide) and a Thermotropic Liquid Crystalline Polymer
HWAHAK KONGHAK, October 1996, 34(5), 597-604(8), NONE
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Abstract
Poly(ether imide)(PEI)와 열방성 액정 고분자(LCP)와의 블렌드의 열적 거동을 시차 주사 열분석기와 주사 전자 현미경을 이용하여 분석하였다. 측정된 유리 전이 온도(Tg)의 결과와 유리 전이 온도에서의 열용량의 증가(△Cp)의 결과로부터 액정 고분자가 PEI-rich 상(phase)에 녹아 들어가는 양이 PEI 가 LCP-rich 상에 녹아 들어가는 양보다 많음을 알 수 있었다. 액정 고분자의 이방성을 고려한 격자이론(lattice theory)으로부터 액정 고분자와 PEI의 고분자-고분자간 상호 작용 계수(χ12)를 결정할 수 있었으며, 블렌드의 조성에 따라 320℃에서 0.179±0.006의 값을 가짐을 알 수 있었다. PEI-LCP 블렌드에서 LCP의 disorder된 정도(y/x1)는 PEI의 무게분율이 많아질수록 증가함을 알 수 있었다.
Blends of poly(ether imide)(PEI) and a thermotropic liquid crystalline polymer (LCP) prepared by screw extrusion have been investigated by differential scanning calorimetry(DSC) and scanning electron microscopy(SEM). From the measured glass transition temperature(Tg) and specific heat increment(△Cp) at the Tg the LCP appears to dissolve more in the PEI-rich phase than does the PEI in the LCP-rich phase. The polymer-polymer interaction parameter(χ12) and the degree of disorder(y/x1) of LCP were investigated using the lattice theory in which the anisotropy of LCP was considered. The polymer-polymer interaction parameter (χ12) was determined and found to be 0.179±0.006 for the extruded blends at 320℃. Degree of disorder(y/x) of LCP in the conjugate phase increase with the increase of PEI weight fraction in the PEL-LCP blends.
Keywords
References
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Hudson SD, Davis DD, Lovinger AJ, Macromolecules, 25, 1759 (1992)
Dowel F, Mol. Cryst. Liq. Cryst., 155, 457 (1988)
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Blizard KG, Baird DG, Polym. Eng. Sci., 27, 653 (1987)
Beery D, Kenig S, Siegmann A, Polym. Eng. Sci., 31, 451 (1991)
