A new thermotropic liquid crystalline polymer (TLCP) having a hexyloxy side group was synthesized for the application of in-situ composite, and the blends of TLCP with poly(ethylene terephthalate)(PET) were prepared by coprecipitation from a common solvent. The thermal, dynamic mechanical properties and morphology of the blends (2, 5, 10, and 20 wt% TLCP/PET) were investigated. In the blends, the liquid crystalline phase did not reveal any significant macrophase separation and thermal degradation at the processing temperature. According to the scanning electron micrograph observation, TLCP domains in the matrix were found to be more or less finely dispersed with 0.2 ㎛ to 0.6 ㎛ in size and interfacial adhesion between the TLCP and matrix polymer was prominent. Results of dynamic mechanical properties showed that modulus of in-situ composite was enhanced with increasing TLCP content.

In-situ 복합재료로서의 응용을 위하여 hexyloxy 곁사슬을 갖는 열방성 액정고분자가 합성되었으며, 이를 폴리(에틸렌 테레프탈레이트)(PET)와 용액블렌드하였다. 제조된 블렌드(2, 5, 10, and 20 wt% TLCP/PET)의 열적, 동적·기계적 성질 그리고 모폴로지를 조사하였다. 블렌드에서 액정상은 가공온도에서 거대 상분리 현상이나 열분해가 일어나지 않았으며 제조된 복합재료의 매트릭스내의 액정상의 크기는 0.2 ㎛에서 0.6 ㎛로 잘 분산되었으며, 매트리스와의 계면에서의 접착력도 우수하였음을 SEM으로부터 관찰하였다. 제조된 in-situ 복합재료의 기계적 성질은 TLCP 함량이 많을수록 증가함을 확인할 수 있다.