【Abstract】 The grafting of styrene on soy protein isolate (SPI) in 8 moL/L urea aqueous solution initiated by ammonium cerous nitrate-potassium persulfate was studied.The grafted copolymers were characterized by NMR.The results indicated styrene had been grafted on the SPI.The films were prepared from aqueous solutions of soy protein and its grafted copolymer at different pH and various plastizer contents.The tensile strength (TS) and the elongation (E%) of these films were determined.The results indicated that TS values of SPI-g-PSt films were higher than those of SPI films,whereas E values of SPI-g-PSt films were lower than those of SPI films.The results also indicated TS and E of SPI-g-PSt and SPI increased with the increasing of pH and TS of SPI-g-PSt films increased with the increasing of graft percentage of copolymer.更多还原