UHMPET/TLCP/PVDF共混体系的研究

采用原位复合法对Veclra A-950热致液晶聚合物（TLCP）、聚偏氟乙烯（PVDF）与超高摩尔质量聚酯（UHMPET）进行共混改性，以改善UHMPET的加工流动性。对其流变性能、热性能以及共混形态进行了探讨。研究了不同混合方法和不同TLCP与PVDF用量对UHMPET各种性能的影响。结果表明，当采用HAAKE流变仪进行混合时，TLCP在UHMPET中呈珠状，二者之间的界面比较模糊，说明两者之间存在相互作用；而采用挤出拉丝时，TLCP在UHMPET中形成明显的微纤状；PVDF在UHMPET基体中无论是采用HAAKE流变仪进行混合还是挤出拉丝，基本上都呈珠状，而且与UHMPET之间存在着明显的界面，在DSC曲线上表现出特有的转变峰，说明两者的相容不好。TLCP和PVDF对改善UHMPET的加工流动性都有贡献。

Study of UHMPET/TLCP/PVDF Blend

UHMPET was blended with Vectra A-950 TLCP and PVDF by means of in-situ composition in order to improve the processing flowability of UHMPET. The rbeological property, thermal property, and morphology of the blend were studied. The effects of different blending methods and different contents of TLCP and PVDF on the properties of UHMPET were studied. The result showed TLCP in UHMPET looked like pearls and the interface between TLCP and UHMPET was relatively obscure because of mutual reciprocity between the two polymers when Haake torque rheometer was used for blending; TLCP micro-fibrils structure formed in UHMPET when extruder was used for blending. Whatever blending methods was used, PVDF in UI-IMPET looked like pearls, the interface between PVDF and UI-IMPET was clear and DSC curves had a special peak, it suggested that the compatibility of PVDF with UHMPET was; not good. The experiment showed TLCP and PVDF had an obvious effects on the improvement of the processing flowability of UHMPET.