丙烯酸系三元嵌段共聚物的合成与表征

利用基团转移聚合（ＧＴＰ）技术,在室温下使用单官能团引发剂,通过对单体加料顺序与时机的控制,合成了一系不同组成比,不同分子量的聚甲基丙烯酸甲酯－聚丙烯酸正丁酯（或乙酯）－聚丙烯腈嵌段共聚物,用ＦＴ－Ｉ,Ｈ－ＮＭＲ,ＧＰＣ等方法对共聚物进行表征,共聚过程活性中心的转移机理。

SYNTHESIS AND CHARACTERIZATION OF ACRYLIC TRIBLOCK POLYMERS

Living" anionic and cationic polymerization techniques are usually used for controlled block polymerization of vinyl monomers.A fundamentally new method with several advantages over the existing processed was reported in 1983 for the polymerization of acrylic monomers-group transfer polymerization(GTP).It's a new insertion polymerization technique.In this paper,a series of triblock polymers with methacrylate,acrylatc and acrylonitrile segments was synthesized at room temperature via GTP.The polymerization is initiated using dimethyl ketene methyl trimethylsilyl acetal(MTS)in the presence of a nucleophilic catalyst Bu4NH(PhCO2)2.During the preparation, the monomer addition order and timing must be controlled in the order of methacrylate, acrylate and acrylonitrile.The products were characterized by 1H-NMR, FT-IR and GPC.The copolymerization mechanism is also discussed.