Synthesis and Flocculating Properties of Starch Graft DAC Copolymers

The graft copolymer of starch St-g-DAC were synthesized through corn starch(St.) and aacryloxye-thyltrimethyl ammonium chloride(DAC) with potassium peroxydisulfate(KPS) as initiator in water solution.The process was optimized through orthogonal tests,the best reaction condition was that the weigh of initiator was 0.15g,the ratio of St and monomer was 1∶3,the reaction temperature was 55℃,the St-g-DAC was synthesized based on this conditions,its cationic ratio was 48.34%,graft ratio was 82.18%,the DAC had been grafted to starch successfully through its structure which was characterized by Fourier transform infrared spectroscopy(FTIR),and the flocculating properties of starch graft acrylamide(St-g-AM),polyacrylamide(PAM) and St-g-DAC were contrasted through jar test for clay water suspension and sewage.The result shows that St-g-DAC is a better flocculant,it has better flocculating performance than PAM and St-g-PAM for clay water and sewage treatment.