| As municipal and industrial sewage contains many organic particles having anionic charge, common flocculants such as neutral and anionic polyacrylamide cannot be used to achieve a satisfying flocculation effect. The cationic flocculant is the suitable candidate. So the research on cationic flocculants has attracted increasing interest during the last 30 years. The copolymer of dimethyldiallylammonium chloride (DMDAAC) and acrylamide (AM) is a kind of water soluble polymer with cationic groups, it's molecular contains high positive charge density, well water soluble, good flocculating ability, less consuming, as well without and environment pollution, so it was highly noticed in the water treatment field.In this work, the copolymer of Dimethyldiallymmonium Chloride and Acrylamide was prepared by inverse microemulsion polymerization in the presence of redox system as initiator, petroleum ether as oil, Span-80 and Tween-80 as composite emulsifier. Dimension and content of granule of the inverse microemulsion system of acrylamide and dimethyldiallylammonium chloride was tested by zata potentiometer/granularity/relative molecular mass analysis instrument. With the progress of polymerization, the volume of granule has augmented. The volume of granule augments by pervasion and collision on the process of polymerization. The study showed that the complex emulsifier's hydrophile and lipophile balance (HLB) , emulsifier's concentration, assist emulsifier, temperature and electrolyte affect the form of the inverse microemulsion polymerization. With the DMDAAC and initiator content increase the intrinsic viscosity falls. The intrinsic viscosity and cationic degrees of polymer affect the solubility of polymer. The flocculating ability is improved by the intrinsic viscosity and cationic degrees of polymer increase. I improved the technics of dispose of water. I improved the method of measure cationic degree by mathematics method. The structure was confirmed by IR.
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