过硫酸钾-亚硫酸氢钠氧化还原引发体系中丙烯酰胺聚合动力学的研究

Potassium Persulfate and Sodium Bisulfite Redox Initiator System of Acrylamide Polymerization Kinetics Research

探讨了过硫酸钾—亚硫酸氢钠组成的氧化还原引发体系在水溶性单体丙烯酰胺溶液聚合中的引发作用,观察到在相同聚合条件下,不同引发剂用量和不同亚硫酸氢钠与过硫酸钾摩尔比时,丙烯酰胺单体转化率、聚合反应速率和聚丙烯酰胺分子量有明显差异。实验结果表明:引发剂用量为0.20%时,AM单体转化率较高,达到95%;引发剂用量为0.15%时,聚丙烯酰胺的分子量较大,为158万;亚硫酸氢钠与过硫酸钾的摩尔比为0.6时,转化率和聚合速率最大;反应速率与引发剂浓度的指数为0.53,与自由基聚合双基终止条件下的理论值0.5接近。

The role of potassium persulfate,sodium bisulfite redox initiator system in water-soluble monomer acrylamide solution polymerization was discussed. At the same polymerization conditions,different dosage of initiator and sodium bisulfite and potassium persulfate,the molar ratio of acrylamide monomer conversion rate,the rate of polymerization and the molecular weight of polyacrylamide have obvious difference. The experimental results show that the dosage of initiator was 0. 20%,AM monomer conversion rate was higher,at 95%; The initiator dosage was0. 15%,the molecular weight of polyacrylamide was larger,1. 58 million; Sodium bisulfite and potassium persulfate molar ratio was 0. 6,the conversion and polymerization rate was the largest. The index of reaction rate to the initiator concentration index was 0. 53,which was closed to the theoretical value of 0. 5 at the radical polymerization double-base termination conditions.