| The graft copolymers of starch, acrylamide, diallyl dimethyl ammonium chloride were synthesized by inversed emulsion copolymerization using ceric ammonium nitrate as initiator and the compounds of Span-80 and Op-4 as emulsifier. The excellent performance of starch-ethylene monomers graft copolymerization was prepared.The graft copolymers were characterized and analyzed by IR and1H-NMR. The affection of synthesis conditions on the graft copolymers were discussed based on graft percentage,graft efficiency,monomers conversion ratio,cationic degree and intrinsic viscosity. The optimum experimentation parameters were determined by single factor experiments and orthogonal experiments as that: stir speed was 450rpm, initiator concentration was 1.5mmol/L,pH was 3-4, HLB was 6.0, emulsifier percentage was 8%, oil:water was 1.4:1(the ration of volume), monomers:starch was 1.5:1 (the ration of weight), monomers concentration was 35%, AM:DMDAAC was 3:7,reaction temperature was 45℃, reaction time was 4h. The product prepared during this condition graft percentage was 122.31%,graft efficiency was92.19 %, monomers conversion ratio was 87.84%, cationic degree was 21.45 and intrinsic viscosity was 628.73 mL/g.When the copolymers were used in treatment for infusorial earth and papermaking waste water, it had high effect of flocculation. It had better effect on flocculation than commercial PAM.The research of biodegradable starch graft copolymerization and its industry application has some theory and practice application value in meliorating starch machining performance, improving its mechanics capability, increasing its dispersion in water in low temperature and penetrability, exploiting and applying starch resource both in breadth and depth, exerting the resourceful advantage in our country in the most extent, advancing industry development and reducing environment pollution from synthesized material.
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