Cationic copolymer PDA of DMDAAC/AM was synthesized by inverse emulsion polymerization with water soluble azo initiation system V50/NaHSO3. Effects of various factors such as the kinds and the amount of initiator, HLB and the dosage of emulsifier and the amount of EDTA on the intrinsic viscosity of copolymer PDA were studied. The results show that the intrinsic viscosity of resulted polymer PDA initiated with complex initiator system of V50/ NaHSO3 was higher than that intiated with APS/ NaHSO3, the optimal amount of V50/ NaHSO3 was 0.6%. The emulsion system was stable when HLB of emulsifier OP10/SpanS0 was 5.7, the dosage of OP10/Span80 was 8% ; and the amount of EDTA was 0.8×10^-4. The copolymer PDA with 902 mL/g intrinsic viscosity was prepared at the above conditions. Preliminary flocculation properties of cationic PDA were also performed.
Journal of Materials Science and Engineering
inverse emulsion copolymei：ization
water-soluble azo initiator