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Properties of Blends of Polycarbonate and a Thermotropic Liquid Crystalline Polymer
Lee HS, Jung WH, Jung HW, Kim WN, Hyun JC
폴리카보네이트와 열방성 액정고분자 블렌드의 물성에 관한 연구
이헌상, 정원호, 정현욱, 김우년, 현재천

Abstract

Thermal properties, morphology, and rheological properties of the blends of polycarbonate (PC) and a thermotropic liquid crystalline polymer (LCP) prepared by screw extrusion have been investigated by differential scanning calorimeter (DSC), scanning electron microscopy (SEM), polarized optical microscopy, and rotational rheometry. From the measured glass transition temperature (T_g), the LCP appears to dissolve more in the PC-rich phase than does the PC in the LCP-rich phase. The polymer-polymer interaction parameter (χ₁₂) and the degree of disorder (y/χ₁ ) of LCP were investigated using lattice theory in which the anisotropy of LCP was considered. The polymer-polymer interaction parameter (χ₁₂) were determined and found to be 0.068 for the extruded blends of PC-LCP (5 : 5) at 523 K. Significant depression of the viscosity is observed in the PC-rich blends and this is mainly due to the fibrous structure of the LCP in the blends. The storage modulus of the PC-rich compositions exceeds that of the matrix component at low frequencies and this result may be due to the increase of elasticity of the blends.

폴리카보네이트(PC)와 열방성 액정고분자(LCP) 블렌드의 열적 거동, 모폴로지, 그리고 유변학적 물성을 시차 주사 열분석기, 주사 전자 현미경, 편광 현미경, 그리고 회전 레오미터를 이용하여 조사하였다. 측정된 유리전이온도(T_g)의 결과로부터 LCP가 PC-rich 상(phase)에 녹아 들어가는 양이 PC가 LCP-rich상에 녹아들어가는 양보다 많음을 알 수 있었다. LCP의 이방성을 고려한 격자이론(lattice theory)으로부터 제안된 식을 이용하여 PC-LCP (5 : 5) 블렌드의 고분자-고분자간 상호작용계수(χ₁₂)를 결정할 수 있었으며, 523 K에서 0.068의 값을 가짐을 알 수 있었다. PC의 전단점도는 소량의 LCP가 첨가됨에 따라 급격히 감소하였으며, 이 결과는 LCP가 섬유상 구조를 형성하기 때문이었다. 낮은 진동수 영역에서 소량의 LCP가 포함된 블렌드의 저장탄성율이 매트릭스인 PC의 저장탄성율보다 높게 나타났으며, 이는 분산상이 구형으로 잘 분산된 경우 분산상 자체가 탄성을 가지기 때문인 것으로 사료된다.

Keywords: polycarbonate; liquid crystalline polymer; blend; morphology; rheology

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Polymer(Korea) 폴리머
Frequency : Bimonthly(odd)
ISSN 0379-153X(Print)
ISSN 2234-8077(Online)
Abbr. Polym. Korea
2024 Impact Factor : 0.6
Indexed in SCIE

This Article

1996; 20(5): 813-822

Published online Sep 25, 1996

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