Synthesis and Propertie of Water-soluble Chitosan Graft Copolymer

[Objective] The aim was to synthesize water-soluble chitosan graft copolymer and study its propertie.[Method] Chitosan graft copolymer was synthesized by a aqueous solution polymerization method,using the ammonium persulfate as initiator graft,acrylamide(AM) and methacrylamide trimethyl ammonium chloride(DMC) as the grafted monomer.The effects of reaction conditions on graft copolymerization were studied.[Result] When the optimum conditions were reaction temperature 50 ℃,initiator 0.08%,degree of deacetylation of chitosan 86% and reaction time 3.5 h,the graft efficiency,monomer conversion and cationic degree were higher.The structure of CTS-AM-DMC was characterized by FTIR and XRD.when the amount of synthetic product was 0.3 mg/L,the effect of floccrlation on the papermaking wasterwater was obvious,which could make the transmission rate of 99%,and CODCr up to 9 mg/L.[Conclusion] The research laid a foundation for further development and application of chitosan.