对氯甲基苯乙烯共聚物引发甲基丙烯酸甲酯原子转移自由基聚合

通过偶氮二异丁氰(AIBN)引发苯乙烯(St)与对氯甲基苯乙烯(p-CMS)共聚,合成了二元共聚物P(St-co-CMS),在氯化亚铜/四甲基乙二胺(CuC l/TMEDA)催化下,以此二元共聚物为大分子引发剂引发甲基丙烯酸甲酯(MMA)的原子转移自由基聚合(ATRP),成功地合成了结构明晰的以聚苯乙烯为主链、聚甲基丙烯酸甲酯为支链的接枝共聚物P(S-g-MMA)。大分子引发剂和接枝共聚物的结构通过红外光谱(IR)、核磁共振氢谱(1HNMR)得到了确认,并测定了接枝共聚物的平均支链数目、平均支链长度、接枝率及接枝效率。结果表明,用这种方法制备的接枝共聚物相对分子质量分布较窄,支链数目及长度可控,接枝效率高达93.7%。

Atom Transfer Radical Polymerization of Methyl Methacrylate Initiated by p-Chloromethylstyrene Copolymers

A well-defined graft copolymer of styrene(St) and methyl methacrylate(MMA) was synthesized by atom transfer radical polymerization with CuCl/TMEDA as catalyst and the copolymer of styrene and p-chloromethyl styrene(p-CMS) as macroinitiator,which was synthesized by copolymerization of St and p-CMS with AIBN as initiator.Structures of these copolymers,i.e.P(St-co-CMS) and P(S-g-MMA),were confirmed by means of IR and ~1HNMR after purification.The average graft number,the average length of side chains,the graft ratio and the graft efficiency were also investigated.The results showed that the relative molecule weight distribution of P(S-g-MMA) was narrow,the number and length of grafts can be controlled,and the graft efficiency was as high as 93.7%.