以K2S2O8-Na2SO3氧化还原体系为引发剂,研究了可溶性淀粉与N,N’-亚甲基双丙烯酰胺在反相悬浮体系中的交联共聚反应动力学,考察了引发剂、交联剂、淀粉、分散剂浓度和反应温度对聚合速率的影响规律。结果表明:在实验考察范围内,动力学关系式确定为Rp∝[I]^0.89·[M]^1.45·[St]^0.73·[Sp]^0.70,交联剂浓度对反应速率影响较大。在交联共聚反应中,单基终止和双基终止同时存在。在30—50℃范围内,聚合反应的表观活化能为49.85kJ·mol^-1。
The kinetics of copolymerization of soluble starch and N, N'- methylene - bis - acrylamide in inverse sus- pension system was investigated with K2S2Os/Na2SO3 as the initiator. The rate orders of copolymerization with respect to the concentration of initiator, monomer, starch, dispersant were determined. The effects of the concentration of the individual components in the polymerization system on conversion were investigated. The results showed that the dependence of the polymerization rate on the concentration of components in the polymerization system could be expressed for all four components by the Rp∝[I]^0.89·[M]^1.45·[St]^0.73·[Sp]^0.70. In the polymerization process, termination of bimolecular chain and unimolecular chain existed at the same time. The concentration of monomer has greater effect on polymerization rate Rp. The apparent activation energy of polymerization was 49.85 kJ ·mol^-1 at 30 - 50℃.