葡萄糖还原FeBr3催化下的甲基丙烯酸甲酯原子转移自由基聚合

以葡萄糖为还原剂,FeBr3为氧化剂,通过氧化还原反应,在反应体系中原位生成FeBr2催化剂,以2,2’-联吡啶(bpy)为配位剂,1-溴乙基苯为引发剂,在110℃进行甲基丙烯酸甲酯原子转移自由基聚合。结果表明,聚合反应符合对单体浓度为一级的动力学关系,聚合物分子量随单体转化率呈线性增加,分子量分布较窄,M-w/-Mn在1.17～1.25之间,具有明显的活性聚合特征,并且在有氧的环境下同样能够进行活性聚合,该聚合方法明显优于常规的原子转移自由基聚合和反向原子转移自由基聚合。

Atom Transfer Radical Polymerization of MMA Under Reduction of FeBr3 by Glucose

Atom transfer radical polymerization(ATRP) of methylmethacrylate(MMA) was conducted at 110 ℃ using 2,2’-bipyridin(bpy) as ligand,1-bromoethylbenzene as initiator,the catalyst FeBr2 was generated in situ by the reaction of the reducing agent glucose with FeBr3. The results show that the polymerization is a first order reaction with respect to monomer concentration. The polymerization displays living character as evidenced by a linear increase of molecular weight with conversion and a relatively narrow molecular weight distribution(M-w/M-n ranges from 1.17～1.25),and the polymerization remains well controlled even in the presence of air. This polymerization method is obviously superior to the conventional ATRP and reverse atom transfer radical polymerization(RATRP).