Graft co-polymerization of acrylamide onto mechanically-activated cassava starch in inverse emulsion

The graft copolymer of starch is a new kind of functional material.The effects of reaction time,reaction temperature,ratio of oil to water,mass fraction of emulsifier and concentrations of starch solution on reaction of graft co-polymerization of acrylamide onto mechanical activated cassava starch in inverse emulsion were conducted.By orthogonal experiment the optimum conditions were determined as reaction time 2 h,reaction temperature 55 ℃,ratio of oil to water 1∶1,mass fraction of emulsifier 4% and starch solution concentrations 8.3%.The monomer conversion,grafting percentage and grafting efficiency are 95.1%,55.3% and 72.2%.Comparing with non-activated cassava starch,the monomer conversion,grafting percentage and grafting efficiency increase 4.2%,8.9% and 7.5%.Mechanical activation enhanced chemical reaction activity of cassava starch,due to crystal structure of cassava starch could be destroyed by mechanical activation,which could enhance reaction activity of acrylamide monomer onto starch.