PET/LCP反应性共混物序列结构与热性能的关系

Relation of Sequence Structure and Thermal Behavior of PET/LCP Reactive Blends

利用2 H NMR方法对聚对苯二甲酸乙二酯 (PET)和热致性液晶共聚酯 60PHB/PET(LCP)体系在少量扩链剂双 (2唑啉 )BOZ存在下形成的反应性共混物的序列长度进行表征 ,并研究序列长度对共混物热性能的影响。研究表明PET和PHB的序列长度均随共混时间的延长和温度的提高而降低 ,且在相同温度下 ,含扩链剂BOZ的共混体系的序列长度比不含BOZ的体系小 ,表明BOZ对酯交换起促进作用。共混物组分中PET的熔点Tm 和熔体结晶温度Tmc均随序列长度 (LPET)的增大而降低 ,而冷结晶温度Tcc却升高。

s The chain structure of the reactive blends of Poly(ethylene terephthalate) (PET)/Copoly(oxybenzoate p terephthalate) (LCP)(70/30 by weight) with addition of bis (2 oxazoline) (BOZ) has been characterized by using 1H NMR and DSC, and the effect of which on the thermal behavior has also been studied. The results show that the number average sequence length of PET and PHB( L PET and L PHB ) decreases with increasing blending time and temperature; L PET and L PHB in the reactive blends are shorter than the blends without BOZ, moreover, both the L PET and L PHB of the blends with addition of BOZ are shorter than those of the blends without BOZ. The T m and T mc of the PET in the reactive blends increases with an increase in L PET while decreases in T cc .