苯乙烯-丙烯酸六氟丁酯梯度共聚物的制备及其增容作用.docVIP

  苯乙烯-丙烯酸六氟丁酯梯度共聚物的制备 及其增容作用# 韩梅，周辉，孙冲，陈艳军** 5 10 15 20 25 30 （武汉理工大学材料科学与工程学院，武汉 430070） 摘要：本文使用两亲性 RAFT 试剂，采用无皂乳液聚合法制备一系列苯乙烯(St) /丙烯酸六 氟丁酯(F6BA)梯度共聚物。通过 1H NMR 分析证实了 St/F6BA 共聚物的梯度链结构。结合 St/F6BA 梯度共聚物的分子量及分子量分布的 GPC 测定结果，研究了 RAFT 试剂用量对聚 合可控性的影响。在最佳聚合条件下合成的 St/F6BA 梯度共聚物可以作为增容剂有效地改 善 PSt/PF6BA 溶液共混体系的相容性，研究了共聚物的添加量、分子量及链结构对增容作 用的影响。研究结果表明，随着 St/F6BA 梯度共聚物分子量的减小、添加量增加，共混膜中 PSt 分散相的尺寸逐渐降低，相容性变好。相比嵌段共聚物，St/F6BA 梯度共聚物对共混体 系的增容效果更好。 关键词：梯度共聚物；制备；增容作用 中图分类号：061 Synthesis and Compatibilization of Gradient Copolymers of Styrene/ 2,2,3,4,4,4-Hexafluorobutyl acrylate HAN Mei, ZHOU Hui, SUN Chong, CHEN Yanjun (School of Matericals Science and Engineering,Wuhan University of Technology,Wuhan 430070) Abstract: In the paper, a series of gradient copolymers of styrene and 2,2,3,4,4,4- hexafluorobutyl acrylate（PSt-grad-F6BA were synthesized by emulsifier-free emulsion polymerization with using an amphiphilic RAFT agent. The gradient structure of the St/F6BA copolymer was confirmed by 1H NMR.Combining with the molecular weight and the molecular weight distribution of P(St-grad-F6BA) from GPC results, the effects of the addition of the RAFT agent on the controllability of the polymerization was discussed. P(St-grad-F6BA) were used as the compatibilizer to improve the compatibility of the PSt/PF6BA blend system. The effects of additional amount, molecular weight and chain structure of the copolymers on the compatibility were investigated. The results indicated that with the decreasing of the molecular weight or the increasing of the addition of P(St-grad-F6BA), the dispersion phase size of PSt was reduced and the compatibility of blends became better. Compared with the block copolymer, P(St-grad-F6BA) more effectively improved the compatibility to the blend system. Key words: gradient copolymer; synthesis; compatibilization 35 0 引言 聚合物共混体系中各组分间的相容性是影响共混材料形态结构和性能的重要因素。添加 嵌段或接枝共聚物是改善聚合物共混体系相容性的一种常用方法，但是嵌段或接枝共聚物在 均聚物共混体系中的 CMC 值较低[1,2,3]，使得增容作用有限制。理论研究表明[4]分子量和分 40 子量分布可控的共聚物对均聚