Synthesis And Properties Of Modified Polyacrylic Superabsorbent

The polyacrylic acid superabsorbent was prepared by inverse suspension polymerization, in which potassium persulfate(KPS) was used as initiator and N,N'-methylene bis-acylamide(MBA) as cross-linking agent. The amphiphilic copolymer of tripolyglycerol monostearate was used as dispersant,and cyclohaxane was used as the organic phase. The factors influencing the water absorption capacities of the superabsorbent such as temperature, neutralization degree, the amount of initiator and crosslinking agent were characterized. The factors which affect the stability of the polymerization were also investigated.Ethylene glycol diacrylate was used for subsequently surface-crosslinker to produce gradient crosslink network. The absorption rate and strength of the superabsorbent were enhanced to obtain the high performance of the resin.Sodium Polyvinyl alcohol sulfate(SPS) was prepared through sulfating of polyvinylalcohol, AA-based superabsorbent interpenetrated with SPS(PSA-IP-SPS) in which SPS was embedded in the polymeric network through entanglement with polyacrylate chains. PSA-IP-SPS showes better properties such as higher water and saline absorbency than PSA, which is related to the stronger degree of ionization of the polymeric network. When the amount of SPS which used in the network was 3.5%, the resin shows the best absorbency.The complex dehumidizer was synthesized by adding inorganic salt into the organic dehumidizer to enhance the moisture content and absorption speed. When the amount of the Potassium acetate is 30%, the complex agent shows the best moisture absorption capacity.The surface structures, morphology of superabsorbent and heat properties were characterized by IR, SEM and TGA.etc.