摘要
在 Instron 毛细管流变仪上测定了热致液晶高分子 KU 9221/聚碳酸酯(PC)共混物和热致液晶高分子 KU 9231/聚醚砜(PES)共混物的流变性能。低切变速率下,液晶高分子的粘度大于 PC 和 PES 的粘度,液晶的加入未能使 PC 和 PES 的粘度下降。高切变速率(通常注塑成型的注塑速率)下,液晶的加入能显著降低体系的粘度。低切变速率下液晶相尺寸大,长径比小。高切变速率下液晶相尺寸小,长径比大。
Rheologic studies of thermotropic liquid crystalline polymers(TLCP)KU9221/polycarbonate(PC)and KU 9231/polyether sulfone(PES)blends were carried out byusing an Instron capillary rheometer.The flow curves show that the viscosity of the TLCP ishigher than those of both PC,PES and their blends with TLCP at low shear rate.At high shearrate,such as normal injection rate,however,the viscosity of the blends is significantly reduced.The TLCP phases are dispersed in greater size and in smaller aspect ratio when extruded at lowshear rate.The dispersion is finer and the aspect ratio increases at high shear rate.
基金
国家自然科学基金
58903427
国家高技术新材料委员会资助
关键词
液晶
高分子
共混
流变性能
thermotropic liquid crystalline polymers
blend
rheological property
