Effect of Mulriple Ionic Emulsifier on Synthesis of Starch Graft Acrylamide Copolymer

Starch graft acrylamide copolymer was synthesized by inverse emulsion polymerization,and the polymerization process conditions were studied.The effects of types,composition amount of emulsifiers and emulsification methods on the monomer conversion rate,grafting ratio,latex particle size and the intrinsic viscosity of the product were investigated.It showed that the emulsion is of good stability and solubility at low temperature with fatty acid(salt) as emulsifier,and the mixing emulsifier of surfactants reveals better emulsification property than a single emulsifier.So we synthesized the starch graft acrylamide with the monomer conversion rate 98%,the graft ratio 80% and the intrinsic viscosity 1300 mL/g by inverse emulsion polymerization using the mixture of oleic acid and sodium oleate as emulsifier.The effects of three kinds of initiators,including ammonium persulfate,ammonium persulfate-urea on the monomer conversion rate and the intrinsic viscosity were investigated.