Study on synthesizing the high degree cationic polyacrylamide

The high molecular weight CPAM was polymerized by using acrylamide(AM) and diallyldimethylammonium chloride(DMDAAC) as monomers.The factors which affect the average molecular weight of the polymer of AM and DMDAAC were investigated.The optimal reaction conditions are as follows:the concentration of monomer AM was 30%,while DMDAAC was 5%;the reaction temperature was 30 ℃,the amount of initiators at the low temperature stage was 0.05‰(compared to the weight of the monomers joining the polymerization),while V-50 was 0.025‰,the weight ratio of potassium persulphate to sodium bisulphite is 1 ∶1,the amount of carbamide was 40‰,and complexing agent was 0.05‰,besides,aerate nitrogen gas for 8 min,then the high molecular weight polymer(M=1.217×107) could be got after 16 h reaction.The cationic polyacrylamide(CPAM),which has been widely used in water treating and separation process of solid and liquid.