关键词: 二甲基二烯丙基氯化铵, 合成, 黏度, 核磁共振, 反相乳液聚合

Abstract: Polymeric flocculant，owning high molecular weight and cationic unit content，was prepared by the inverse emulsion copolymerization of acrylamide（AM） and diallyl dimethyl ammonium chloride （DMDAAC）. The flocculation effect of poly（DMDAAC-co-AM）（PDA） was examined. The influences of types of initiator and dispersant on the copolymerization were explored. The effects of monomer ratio，initiator concentration and emulsifier content on the molecular weight of product and monomer conversion were studied. Fourier transform infrared spectrum（FTIR），nuclear magnetic testing（1H NMR） and ultraviolet spectrum were used to characterize the products. The results show that AM and DMDAAC did copolymerize，and the content of DMDAAC of the copolymer was much higher than that obtained by solution copolymerization. With [DMDAAC]/[AM]=1∶4，initiator concentration is 30mmol/L，and emulsifier content is 18%，the viscosity-average molecular weight of copolymer achieves 2.2×105，and the cationic units content is 17%.

Key words: diallyl dimethyl ammonium chloride, synthesis, viscocity, NMR, inverse emulsion copolymerization