链转移剂对聚丙烯酰胺产品分子量和不溶物的影响

Effect of Chain Transfer Agent on Molecular Weight and Insoluble Matter of Polyacrylamide

以丙烯酰胺(AM)、丙烯酸(AA)为原料,采用低温复合引发剂体系(叔丁基过氧化氢-硫酸亚铁与偶氮引发剂)制备了高分子量阴离子聚丙烯酰胺产品。探讨了不同链转移剂及其使用量对聚丙烯酰胺产品分子量和不溶物的影响。实验结果表明,次亚磷酸钠的链转移效果较好,在使用量为20×10^(-6)时,所得聚丙烯酰胺产品分子量接近1 900万,不溶物小于0.3%。

High molecular weight anionic polyacrylamide(HPAM)was prepared from acrylamide(AM)and acrylic acid(AA)by low temperature composite initiator system(tert butyl hydrogen peroxide ferrous sulfate and azo initiator).The ef⁃fects of different chain transfer agents and their dosage on the molecular weight and insoluble matter of polyacrylamide were discussed.The results showed that the chain transfer effect of sodium hypophosphite was good.When the dosage of sodium hypophosphite was 20×10^(-6),the molecular weight of polyacrylamide was close to 19 million,and the insoluble substance was less than 0.3%.