PS/PA6/SEBS-g-MA共混体系的非等温结晶行为、流变性能及力学性能的研究

Study on Non-isothermal Crystallization Behavior, Rheological and Mechanical Properties of PS/PA6/SEBS-g-MA Blends

聚苯乙烯（PS）／聚酰胺（PA6）共混物中加入5份的马来酸酐接枝氢化苯乙烯-丁二烯嵌段共聚物（SEBS-g—MA），提高了PA6的结晶度，但使结晶时问延长。非等温结晶动力学研究表明，在结晶前期，SEBS-g—MA可能对PS／PA6中的PA6有异相成核的作用，结晶后期，PS／PA6和PS／PA6／SEBS-g—MA的结晶方式基本一致。加入SEBS-g—MA，原位生成SEBS-g-PA6，提高了共混物的复数黏度（η^＊）和储能模量（G’），在G’相同的情况下，PS／PA6／SEBS-g-MA的损耗模量（G″）低于PS／PA6。PS／PA6／SEBS-g—MA（50／50／5）共混物的冲击强度较PS／PA6（50／50）略有降低，拉伸强度略有提高。当SEBS-g-MA的用量大于5份后，拉伸强度降低，断裂伸长率增加，共混物的冲击强度随SEBS-g—MA含量的增加不断提高，PS／PA6／SEBS-g—MA（50／50／20）的冲击强度提高了2．4倍。

Introducing 5 phr SEBS-g-MA into blends of PS/PA6, the degree of crystallinity of the latter was increased but the rate of crystallization decreased. Through the interaction between PA6 and SEBS- g-MA, SEBS-g-PA6 was generated in situ and thus caused the storage modulus and tensile strength increased based on neat PS/PA6, but the Charpy notched impact strength decreased a little. However, when the loading of SEBS-g-MA was larger than 10 phr, the tensile strength decreased, the elongation at break and Charpy notched impact strength of the blends increa, ed. The impact strength for a PS/ PA6/SEBS-g-MA （50/50/20） blend was 2.4 times higher than that of neat PS/PA6（50/50）.