镍络合物对丙烯酰胺可控聚合作用

Controllable polymerization of acrylamide in nickel complex system

以EDTA、EDTA/en为配体分别与镍盐形成络合物作为催化体系,水溶性KPS为引发剂,选择非离子性丙烯酰胺为单体,研究镍络合体系对丙烯酰胺的原子转移自由基聚合反应的影响。通过测定聚合过程单体转化率,聚合物相对分子质量及动力学曲线线性相关性结果表明,两种体系均具有可控性。但是单独使用EDTA为配体时聚合温度45℃,线性相关系数为0.940 78,EDTA/en混合为配体时聚合温度较低(30℃)且当KPS浓度为3.521mmol/L、络合物浓度为4.499mmol/L时可控性更好,线性相关系数达到0.991 68,且黏均相对分子质量达到千万级。

The effect of nickel complexes on ATRP polymerization of acrylamide was studied with potassium persulfate as initiator,nonionic acrylamide as monomer and nickel complex system as catalyst.The results of conversion,molecular weight and kinetic plots linear relationship indicated that the polymerization was controllable.The polymerization temperature was 45 ℃ and linear relationship was 0.940 78 when EDTA used as ligand only.The polymerization temperature was down to 30 ℃ when EDTA/en was used as ligand and the controllability was better when concentration of KPS and complex were 3.521 and 4.499 mmol/L respectively,in which the linear relationship was0.991 68 and molecular weight could reach to ten million.