Graft copolymerization of granular starch maleate with acrylamide for enhancing grafting efficiency

摘要

Graft copolymerization of granular starch maleate with acryl-amide using Fenton's initiator in aqueous dispersion was investigated for increasing grafting efficiency of the copoly-merization. The graft copolymerization was characterized in terms of grafting efficiency, grafting ratio, and conver-sion of monomer to polymer. Effects of maleate modifica-tion of starch on the efficiency, ratio, and conversion were explored. Influences of reaction variables such as pH value, molar ratio of H_2O_2 to Fe~(2+), initiator concentration, monomer concentration, polymerization temperature, and time on the copolymerization were investigated. It was observed that the modification of starch markedly increased grafting efficiency and ratio. The graft copolymerization should be carried out under the protection of nitrogen gas at 30°C-45°C for 3 h