Preparation of Polyaspartic Acid/Polyacrylic Acid Interpenetrating Networks Absorbent Polymer

Polyaspartic acid/polyacrylic acid interpenetrating networks absorbent polymer(IPNAP) was prepared using polyaspartic acid(PAsp) and acrylic acid(AAc) as raw materials,potassium peroxydisulfate as initiator,N,N′-methylenebisacrylamide as crosslinking agent by two step synthetic method.The IPNAP was characterized by FTIR.Effects of mass ratio of AAc to PAsp,initiator amount,crosslinking agent amount,and neutralization degree of AAc on absorbing property of IPNAP were studied.The results indicated that when the mass ratio of AAc to PAsp was 1.0∶1,the initiator amount was 0.50%,the crosslinking agent amount was 0.40%,the neutralization degree of AAc was 75%,the absorbing property of IPNAP was the best with the absorbing ratio of 826 g·g-1 and 120 g·g-1in distilled water and normal saline,respectively.