氧化还原体系引发乙烯类单体自由基聚合过程中,氧化剂或还原剂浓度的变化可能引起聚合机理的改变,Reddy等研究“铜(Ⅱ)——维生素C-氧”体系引发甲基丙烯酸甲酯的自由基聚合时,发现随着Cu~(2+)离子浓度增加,聚合速度由上升至下降;单体反应级数从3/2增至2.0,我们在空气气氛下,对Cu~(2+)-Na_2SO_3体系引发甲基丙烯酸甲酯聚合进行了研究,亦发现Cu~(2+)离子浓度对聚合速度和聚合机理有很大影响,在较低的Cu~(2+)离子浓 The redox system initiates the change of the concentration of oxidant or reductant during the radical polymerization of vinyl monomer, which may cause the change of polymerization mechanism. Reddy et al. Studied the effect of “Cu (Ⅱ) -Vitamin C-Oxygen” system on the polymerization of methyl methacrylate The results showed that the rate of polymerization increased from ascending to descending with the increase of Cu 2+ concentration. The reaction order increased from 3/2 to 2.0. Under the air atmosphere, +) - Na_2SO_3 system was studied. It was also found that the concentration of Cu 2+ greatly influenced the polymerization rate and polymerization mechanism. In the low Cu 2+ concentration