铜络合物催化体系下丙烯酰胺-丙烯酸控制聚合反应研究

AM/AA controlled polymerization in the copper complex catalyst system

利用反向原子转移自由基聚合,在均相水介质中,采用铜(Ⅱ)催化体系,水溶性引发剂引发丙烯酰胺-丙烯酸的可控聚合。以过硫酸钾(KPS)为引发剂,以氯化铜与乙二胺(en)形成的络合物为催化剂,在水相中进行丙烯酰胺(AM)、丙烯酸(AA)反向原子转移自由基聚合反应。控制原料配比、聚合温度、单体浓度、反应时间、催化剂与配体配比等条件,可使反应呈现一定的可控性。通过测定单体转化率、聚合物黏均相对分子质量与转化率的关系,对丙烯酰胺聚合反应可控性进行了讨论。实验较佳控制条件为:原料配比为n(AM/AA)∶n(CuCl2)∶n(en)∶n(KPS)=400∶1∶2∶0.27,温度为45℃,反应时间为8 h。

The RATRP of AM and AA was studied using KPS as the water-soluble initiator,the Cu（Ⅱ） as the catalytic systems,in homogeneous aqueous medium.The controllable reaction will be achieved by controlling ratio of materials,polymerization temperature,single mass,reaction time,catalysts and ligands ratio,and other conditions.The evolution of molecular mass vs conversion is discussed for the controllability of amide polymerization.The experimental result showed that the reaction system was controllable when the materials ratios are n（AM/AA）∶n（CuCl2）∶n（en）∶n（KPS）= 400∶1∶2∶0.27,temperature is 45 ℃,reaction time is 8 h.