增韧改性聚对苯二甲酸丁二酯/聚碳酸酯共混物非等温结晶动力学与力学性能  

Non-isothermal crystallization kinetics and mechanical properties of polybutylene terephthalate/polycarbonate blends modified by toughening agent

作　　者：周健[1] 吴承旭[2] 王国军[1] 李磊[2] 杨润苗[1] 董观秀[1] 

机构地区：[1]江苏技术师范学院材料工程学院,江苏常州213001 [2]常州大学材料科学与工程学院,江苏常州213164

出　　处：《化工学报》2011年第12期3588-3594,共7页CIESC Journal

基　　金：国家自然科学基金项目(40973046)~~

摘　　要：引言 聚对苯二甲酸二丁酯（PBT）是一种结晶速度快的热塑性工程材料，具有优异的耐溶剂性和加工流动性，但其玻璃化转变温度低（约为45℃）、制品成型收缩率较大，存在着缺口冲击强度低、高温下刚性不足等缺点。The polybutylene terephthalate （PBT） / polycarbonate （PC） blends modified by toughening agent （S-2001） consisting of methyl methacrylate, styrene and silicone were prepared via melt blending. The non-isothermal crystallization kinetics of the blends were investigated by scanning calorimetry （DSC） at different cooling rate of 5℃· min^-1, 10℃· min^-1, 15℃· min^-1, and the data were analyzed by using modified Avrami theories of the Jeziorny method. The influence of toughening agent （ S-2001 ） on crystallization and mechanical properties of PBT/PC blends was discussed. The microstructure of toughened PBT/PC blend was observed by scanning electron microscopy （SEM）. The results showed that the crystallization rates of the toughened PBT/PC blends increased as the cooling rate increased; the non-isothermal crystallization rate constant Zc decreased, the crystallization half time t1/2 increased, crystallinity of PBT decreased with increasing amount of toughening agent （S-2001） at the same cooling rate, which indicated that the addition of toughening agent （S-2001） had a negative effect on the crystallization of PBT. Toughening agent （S-2001） provided good compatibility with PBT and PC. As the amount of toughening agent （S-2001） increased, the toughness and elongation at break of PBT/PC blends significantly increased, the SEM of Izod impact section for toughened PBT/PC blend indicated the change of its Izod impact section from fragility break into toughness break. When the content of toughening agent （S-2001） was 15 parts per hundreds of PBT/PC, the Izod impact strength of PBT/PC blends reached 67 kJ · m^-2. But the rigidity of PBT/PC blends decreased a little.

关 键 词：共混物 增韧剂 非等温结晶动力学 增韧改性 

分 类 号：TQ327.5[化学工程—合成树脂塑料工业]