Synthesis and Application of Grafting Copolymer of Modified Starch and Acrylic Acid

Grafting copolymerization of acrylic acid and modified starch by heat treatment was investigated. Realization of the reaction was proved by infrared spectrum. Effects of concentrations of monomer and initiator,reaction temperature and reaction time on grafting efficiency and graft rate were studied.When concentrations of acrylic acid,ammonium persulfate and modified starch are 0 42 mol/L,3 0×10 -3 mol/L and 70 g/L respectively,at reaction temperature of 60 ℃ and reaction time of 3 h,the synthesized adhesion agent has an adhesion ratio of 100%, water absorption of 150 14% and oil absorption of 2 06% .Mixture of the grafting copolymer and paper pulp is pressed into a board whose impact strength and stress strength are 3 25 kN/m and 3 75MPa respectively.These properties are superior to that with an adhesion agent of non grafted modified starch.