Swelling behaviors of acrylamide-acrylic acid copolymerization hydrogel

The swelling kinetics of acrylamide-acrylic acid copolymerization(P(AM-co-AA))hydrogel prepared by glow-discharge-electrolysis plasma is investigated in distilled water.The influences of various temperature,pH values and salts solutions on the equilibrium swelling ratio are preliminarily studied.The results show that the swelling kinetics followed the non-Fick diffusion behavior at 20℃.The P(AMco-AA)hydrogel is responsive to the pH and salts,and it has excellent on-off switching behavior as reversible swelling and deswelling at pH 6.4and 2.0.In addition,the equilibrium swelling ratio of univalent cation salt solution is higher than that of bivalent cation salt solution.