苯乙烯-丙烯酸六氟丁酯梯度共聚物的制备及其增容作用

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.