嵌段共聚物在共混体系中的增容作用研究II.PS-b-PMMA对PVC/SBS共混体系相态结构的影响

STUDY ON THE COMPATILIZATION OF BLOCK COPOLYMERS IN POLYMER BLENDS II. INFLUENCE OF PS-b-PMMA ON THE MORPHOLOGY OF PVC/SBS BLENDS

合成了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。系统研究了 PVC/SBS的组成比、增容剂的用量以及增容剂的分子结构等因素与共混体系相态结构之间的关系。结果表明 ,增容剂的不同结构对共混体系的相态结构影响很大 ,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增容剂分子 ,具有更好的增容效果 ,其增容的共混体系具有典型的韧性特征。

A series of poly(styrene b methyl methacrylate) with different molecular weight and monomer composition are used as the compatilizers of PVC/SBS blends. By observing the relationship between the morphology of PVC/SBS blends and the factors, such as the composition of PVC and SBS , the content and the molecular structure of the compatilizer, the compatilizing effect of PS b PMMA to PVC/SBS blends is studied. The molecular structure of PS b PMMA has important influence on the morphology of PVC/SBS blends. Among the adopted compatilizers, the one with smaller molecular weight and closer chain length of PS and PMMA has better compatilizing efficacy.