Synthesis and Application of Starch Modified Polyacrylate Nutritious Super Absorbent

DU Feng,FANG Xianli and XIANG Shanglin(Jiangsu Ruifeng Science and Technology Industrial Co.LTD,College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,China)

Interpenetrating network hydrogel;Polyacrylate;Starch;Super absorbent

Nutritious super absorbent made of starch modified polyacrylate was prepared using starch as modifier and urea as fertilizer in order to provide basis for the research and application of functional super absorbent.Polyacrylate/starch(PAA/St) hydrogel having interpenetrating network was synthesized using two-step aqueous solution polymerization.The influences of starch amount on swelling properties of hydrogels were investigated in detail.For the sake of testing the role of synthesized PAA/St hydrogel as super absorbent,the effect of its addition on sacsaoul survival under water deficit environment was studied.The synthesized PAA/St hydrogel exhibited high mechanical strength.Besides,highest swelling ratio and swelling rate were observed at 10% dosage of starch.Accordingly,survival of sacsaoul was improved in the presence of this PAA/St hydrogel.In comparison with traditional polyacrylate hydrogel,two-step synthesized PAA/St hydrogel at appropriate amount of starch dosage showed higher water absorption and reservation performance which provided it with certain water reservation and fertilizer supplement functions for plant.