Graft copolymerization of (dimethylamino)ethyl methacrylate onto chitosan initiated by ceric ammonium nitrate

摘要

(Dimethylamino)ethyl methacrylate (DMAEMA) was grafted onto chitosan using ceric ammonium nitrate as initiator in acetic acid solution. The effects of reaction variables on the grafting percentage and efficiency percentage were investigated, including the amounts of monomer and initiator, reaction time and reaction temperature. The grafted copolymers were confirmed by FTIR, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results of TGA and DSC indicated the improvement of thermal stability for chitosan-g-poly(PDMAEMA). Solubility test revealed the improved hydrophilicity of grafted chitosan in aqueous acetic acid solution, and its swelled behavior in mixtures of glacial acetic acid and anhydrous ethanol (the ratios of 1:1 and 1:2, v/v). The grafted copolymer possessed amphiphilic structure and exhibited properties of polymeric surfactant.