Study on craft copolymerization of starch with acrylic acid by inverse emulsion polymerization with redox initiator

The starch and acrylic acid graft copolymerization were synthesized by inverse emulsion polymerization,in which the continuous phase was cyclohexane, emulsifying agent was Span20 under the condition of redox initiation system.The copolymerization was characterized with IR. The experiment results showed that the copolymerization can be proceeded fastly in low temperature, and the optimum reaction condition are as follows:the concentration of initiator is 3.1 mmol/L,the acrylic acid concentration is 2.6 mol/L,the reaction temperature is 30℃,the reaction time is 3 h,the emulsifying agent is 5%, the monomer conversion rate is 92.6%, grafting ratio is 43.2% and grafting efficiency is (56.4%.)