Synthesis of SA-IP-P(AA/AM) superabsorbent resin with IPN by fractional step method and research of its properties

A novel SA-IP-P(AA/AM) interpenetrating network(IPN) super absorbent resin was synthesized via fractional step method,which used SA as interpenetrating polymer,acrylic acid(AA) and acrylamide(AM) as polymerization monomer,N,N'-methylene biasacrylamide as crosslinking agent,ammonium persulfate and sodium hydrogensulfite as the redox initiator.The optimum synthesis conditions were monomer AA/AM proportion 0.4,neutralization degree 85%,initiator 0.32%,crosslinking agent 0.035% and SA 8%.Under such conditions,the water absorbency and 0.9%NaCl saline absorbency of SA-IP-P(AA/AM) resin could reach 1 480 g·g-1 and 120 g·g-1 respectively.The authors studied the IPN structure in the product via IR,SEM,TEM and X-ray diffraction.On the basis of retaining good performance of synthesized resin,they further improved the water absorbency,saline absorbency and environmental responsibility of super absorbent resin.