A To Improve Pda Colloid Relative Molecular Mass Of New Methods To Explore

In this paper, a kind of water-soluble cationic copolymer PDA of diallyldimethylammonium chloride (DMDAAC) and acrylamide (AM) was prepared by stage-addition of a major portion of the acrylamide monomer and by improving cationic monomer's purity. The effects of reaction conditions on copolymerization of preparing PDA with 30% cationicity by stage-addition were studied, and under a good reaction condition the intrinsic viscosity of the product PDA with 30% cationicity was 6.6 ~ 7.1dL/g and cationic monomer DMDAAC conversion was about 65%. Meanwhile, a refining method of the cationic monomer was provided and researched after impurities were analyzed through instruments. And then,the refined cationic monomer DMDAAC was used to synthesize PDA with 30% cationicity. After orthonormal experiments, a better reaction condition was founded and the intrinsic viscosity of PDA with 30% cationicity reached 7.2dL/g, and all the important factors on copolymerization were also researched. The results illustrated that the reaction conditions on preparing PDA with 30% cationicity by stage-addition was testified to be appropriate to different batch cationic monomers in copolymerization of preparing PDA and it settled a base for advanced research. And a useful method was obtained to improve the intrinsic viscosity of PDA by improving cationic monomer's purity.