二甲基二烯丙基氯化铵的反相乳液共聚合

用反相乳液聚合的方法合成的水溶性阳离子型聚合物—二甲基二烯丙基氯化铵(DMDAAC)和丙烯酰胺(AM)的共聚物。该聚合体系以煤油为分散介质,以Span-80和OP-10为乳化剂,以过硫酸钠和亚硫酸钠为引发剂。在油相/水相(V/V)为30/70、水相单体浓度为60%、DMDAAC∶AM为1∶1、乳化剂用量为6%、引发剂用量为0.2%、聚合温度为30℃的条件下聚合12小时,聚合物的特性粘数达2.56 dl/g。该反相乳液聚合用水溶性引发剂,其聚合机理与典型乳液聚合不完全相似,在乳化剂用量较少时,聚合物的分子量随乳化剂用量增加而增大,当乳化剂用量增加到一定程度后,聚合物的分子量随乳化剂用量无明显变化。

Inverse Emulsion Copolymerization of DMDAAC Monomer

DMDAAC-AM poly(Dimethyl Diallyl Ammonium Chloride)] was prepared by means of inverse emulsion polymerization technique. The reaction uses kerosene as bulk-phase, Span-80 and OP-10 as emulsifier, persulfate/sulfite as initiator. During copolymerization the 0.2% initiator based on the amount of total monomer weight is used and so does 6% of emulsifier based on the total volume of reactive system, and the ratio of oil- phase, aqueous-phase is 30/70 , and the concentration of the monomer (DMDAAC/AM was 1/1) is 60% in the aqueous-phase. The mechanism of the inverse emulsion polymerization is not completely similar to typical emulsion polymerization because water-soluble initiators are used. The molecular weight of the polymers increases as emulsifier increases when the emulsifier is lower but does not increase as emulsifier increases when the emulsifier is