嵌段共聚物在共混体系中的增容作用研究Ⅲ.PS-b-PMMA对PVC/SBS共混体系动态力学行为的影响

STUDY ON THE COMPATILIZATION OF BLOCK COPOLYMERS IN POLYMER BLENDS Ⅲ. INFLUENCE OF PS-b-PMMA ON THE DYNAMIC MECHANICAL BEHAVIOR OF PVC/SBS BLENDS

采用自制的一系列分子量和单体组成比不同的聚苯乙烯 -聚甲基丙烯酸甲酯两嵌段共聚物 ( PS- b- PMMA)作为 PVC/SBS共混体系的增容剂。研究增容剂的用量、PVC/SBS的组成比以及增容剂的分子结构等因素与共混体系动态力学性能之间的关系。结果表明 ,增容效果与增容剂的分子结构有密切关系 ,在所合成的 4种增容剂中 ,分子量相对较小 ,分子内聚甲基丙烯酸甲酯嵌段的分子量与聚苯乙烯嵌段的分子量比较接近的 PS- b- PMMA- 1和PS- b- PMMA- 2对 PVC/SBS具有更好的增容效果。

A series of poly(styrene b methyl methacrylate) with different molecular weight and monomer composition are used as the compatilizers of PVC/SBS blends. The factors affecting the compatilizing effect of compatilizers are studied systematically by investigating the influence of the composition between PVC and SBS, the content and the molecular structure of the compatilizer on the dynamic mechanical of PVC/SBS blends. The copolymers with smaller molecular weight and closer chain length of PS/PMMA are better compatilizer of PVC/SBS blends.