Synthesis of amphoteric inartificial polymer using starch as base material and factors affecting its solubility

The amphoteric graft copolymer was synthesized by copolymerization of starch with acrylamide,acryloyethyl trimethyl ammonium chloride and 2-acrylamino-2-methylpropanesulfonate in aqueous solution.The influences of concentration of initiator,reaction temperature,reaction time,concentrations of solubilizer and concentrations of EDTA-2Na on the monomer conversion,grafting ratio,intrinsic viscidity and solubility were investigated.Following is the optimum reaction condition: mass concentration of initiator,0.1%;monomer/starch(in mass),7∶3;reaction temperature,50 ℃;reaction time,4 h.The grafting ratio,monomer conversion,and intrinsic viscidity achieve 217.92%,(93.74%,) and 543.31 mL/g,respectively.