Graft copolymerization of acrylic acid(AA) and acrylamide(AM) on cellulose to prepare super absorbent resin (SAR) under microwave irradiation were investigated using N,N-methylene bis-acrylamide as crosslinking agent, and potassium persulfate/sodium thiosulfate as initiator. The results indicated that it only needed 5min under the microwave level of 320W to obtain the resin with the maximum absorption amount of 1388g•g-1 , under the conditions that the ratio of acrylic acid to cellulose of 14:1, 0.25wt% initiator to AA, 0.25wt% crosslinking agent, 70% neutralization degree of AA. Under microwave irradiation, the preparation of SAR could be completed without the protection of nitrogen. Compared to conventional heating method, the methods had the striking advantages of short reaction time, simple process and low cost.

Graft copolymerization of acrylic acid(AA) on starch to prepare super absorbent resin (SAR) under microwave irradiation were investigated using N,N-methylene bis-acrylamide as crosslinker and potassium persulfate as initiator. The influences of the amount of initiator and crosslinker, neutralization degree of acrylic acid(AA), ratio of starch to AA, microwave power level and irradiation time on the distilled water absorption amount of resin were investigated. The results indicated that it only needed 4min under the microwave level of 231W to obtain the resin with the maximum absorption amount of 1110g×g-1, under the conditions that 0.3wt% initiator, 0.02wt% crosslinker, 60% neutralization degree of acrylic acid, the ratio of starch to acrylic acid of 0.25. Under microwave irradiation, the synthesis and drying of super absorbent resin could be completed at one step without nitrogen. Compared to conventional heating method, the methods had the striking advantages of short reaction time, simple process and low cost.