苯乙烯的RAFT聚合及嵌段共聚物的合成

Reversible Addition-fragmentation Chain Transfer Polymerization of Styrene and Synthesis of Derived Block Copolymer

采用三硫代碳酸双(α,α′-二甲基-α″-乙酸)酯作为可逆加成-断裂链转移(RAFT)聚合的链转移剂,制备了一系列具有不同相对分子质量,且相对分子质量分布较窄的聚苯乙烯均聚物.以得到的末端冠有链转移剂活性基团的聚苯乙烯作为大分子链转移剂,与丙烯酸乙酯(EA),丙烯酸丁酯(BA),甲基丙烯酸乙酯(EMA)和甲基丙烯酸丁酯(BMA)4种单体分别进行嵌段聚合反应;通过一步投料,合成了聚苯乙烯-聚(甲基)丙烯酸酯类的两亲性三嵌段共聚物.使用凝胶渗透色谱(GPC)、1 H-NMR对共聚物进行表征.

Polystyrene was polymerized through using the S,S′-bis（R,R′-dimethylacetic acid） trithiocarbonate as reversible addition-fragmentation chain transfer（RAFT） agents.The synthesized polystyrene had various controlled molecular weight and narrow molecular weight distribution.A series of different amphiphilic triblock copolymers were respectively synthesized with the addition of ethyl acrylate,butyl acrylate,ethyl methacrylate and butyl methacrylate.During the synthesis of triblock copolymers,the above obtained polystyrene was used as macromolecular RAFT agent.The derived poly（methy）acrylate block polystyrene block poly（methy） acrylate copolymers were characterized by GPC and 1H-NMR.