新型聚芳醚酮与热致性液晶高聚物共混物流变性能和力学性能的研究

THE RHEOLOGICAL AND MECHANICAL PROPERTIES FOR PEK-C/LCP BLENDS

本文研究了新型聚芳醚酮与热致性液晶高聚物(PEK-C/LCP)共混物的流变性能及力学性能。结果表明:由于LCP的加入,PEK-C的熔体粘度降低;随着剪切速率的增加,共混物熔体流动活化能从223.5KJ/mol降为102.2KJ/mol。共混物的玻璃化转变温度从纯PEK-C的218℃降为199℃;除模量增加外,其它力学性能均有所下降。同时利用SEM观察了共混物冲击断面形貌,未发现有LCP微纤维生成。

Phenolphthalein polyether-ether ketone (PEK-C) containing 10% thermotropic liquid crystalline polymer (LCP) were prepared by melt-blending. Rheological properties of blends were studied using cone plate rheometer, the activation energy for flow process (E) was calculated from the Arrhenius equation, its value was rapidly decreased from 223. 5 KJ/mol to 102. 2 KJ/mol when the shear rate increases from 0.11 s-1 to 1.17 s-1. Glassy transition temperature of PEK-C in the blends lowered from 218℃ to 199℃ comparing with neat PEK-C. Mechanical properties, except modulus, of PEK-C did not change significantly after blending with LCP. It was shown from results of SEM that the LCP in the blends was present in a discrete phase, and diameter of LCP was about 1μm. The droplets of LCP scattered throughout the polymer matrix.