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Issue
HWAHAK KONGHAK,
Vol.34, No.5, 597-604, 1996
Poly(ether imide)와 열방성 액정 고분자 블렌드의 물성
Physical Properties of Blends of Poly(ether imide) and a Thermotropic Liquid Crystalline Polymer
이헌상, 김병현, 김우년, 현재천
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: Liquid Crystalline Polymer; Interaction Parameter; Glass Transition Temperature; Poly(ether imide)
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