Synthesis And Properties Study Of Chitosan-g-Poly (Acrylic Ester) Grafted Copolymer

Chitosan is a well-known abundant natural polymer with unique chemical structure , nontoxic , good biodegradability, biocompatibility and bioactivity.But the insolubility in common organic solvents and non-thermalplasticity of chitosan have delayed its utilization and basic research . Graft copolymerization of chitosan is more attractive to expand the applications as functional materials.In this paper , the structure, properties, research evolution and application of chitosan are reviewed.The grafted-copolymers of chitosan with acrylic ester, such as methyl acrylate (MA) , methyl methacrylate (MMA), were synthesized by radieal Polymerization, using ceric ammonium nitrate or ammonium peisulfate and hyposulphite as an initiator in acetic acid solution. The effects of the concentration of chitosan , reaction variables including the amounts of monomer and initiator, reaction time and reaction temperature on the grafting efficiency (GE%) and grafting ratio (G%)have been investigated.Grafted copolymers were characterized by FTIR, X-ray diffraction.The thermal analysis of chitosan and grafted products were studied by thennogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results were showed:(1) The acrylic ester can graft into the main chain of chitosan molecule successfully.(2) By the research of chitosan and MA grafting copolymerization, using ceric ammonium nitrate as an initiator in acetic acid solution. The influeneing rules of reaction conditions to graft reaction were discussed. (3) By the research of chitosan and MMA grafting copolymerization, using ammonium persulfate and hyposulphite as an initiator in acetic acid solution. The influencing rules of reaction conditions to graft reaction were discussed.