二过碘酸合银(Ⅲ)络离子氧化还原引发丙烯酰胺聚合反应动力学的研究

Studies on the Kinetics of Acryl amide Polymerization Redox Initiated by Diperiodato-argentate(Ⅲ) Complex Ion

二过碘酸合银[Ag(Ⅲ)]在氧化还原反应中为双电子转移反应,没有中间自由基产生,不能引发丙烯腈聚合.我们发现,Ag(Ⅲ)与不同还原剂组成氧化还原体系,在一定条件下,能引发烯类单体聚合.本文研究了Ag(Ⅲ)为氧化剂、丙烯酰胺(AM)为还原剂引发AM聚合反应的动力学,得到了聚合速率方程和表观活化能,测得了聚合物分子量M,探讨了引发机理.

The kinetics of acrylamide polymerization initiated by diperiodato-argentate(Ⅲ)[Ag (Ⅲ)3 was studied in alkaline medium.The results indicate that the equation of the polymerization rate is as follows:Rp=k[AM]1-21[Ag(Ⅲ)]0.90 and the overall activation energies of AM polymerization are 48.5kJ/mol.The polymer molecular weight decreases with increasing Ag(Ⅲ).The effects of reaction conditions on the polymerization rate were also studied.The initiation mechanism was proposed.