Preparation of Starch-based Degradable Superabsorbent Resin

By taking ammonium cerium nitric acid as the initiator,a superabsorbent resin was prepared from graft copolymer of corn starch and acrylamide.The polymerization was confirmed by ultra-red spectrum analysis.The influence of the cross-linking agent amount,initiator and its amount,reaction temperature and monomer ratio time on the water absorbency of the graft copolymer were investigated.The optimum reaction conditions are as follows: at 40 ℃,the mass ratio of starch and acrylamide is 1∶2;mole ratio of cross-linking agent to acrylamide is 1.10×10-1;mole ratio of initiator to acrylamide is 2.18×10-3.water absorption rate of the resin is 716 times as many as its own mass.Through degradation tests of the superabsorbent resin,the authors found that it will decompose naturally in less than one month under natural conditions.