聚(丙烯酰胺-co-丙烯酸)水凝胶的溶胀性能研究

Swelling behaviors of acrylamide-acrylic acid copolymerization hydrogel

探讨了用辉光放电电解等离子体引发制备的聚(丙烯酰胺-co-丙烯酸)(P(AM-co-AA))水凝胶的溶胀动力学行为,研究了pH、温度和盐溶液浓度对平衡溶胀率的影响.结果表明,20℃时,P(AM-co-AA)水凝胶在蒸馏水中4h达溶胀平衡;溶胀过程遵循non-Fick溶胀扩散行为;该水凝胶具有pH敏感性和盐敏感性;在pH=6.4和pH=2.0的溶液中具有可逆溶胀-消溶胀开关行为;在单价阳离子盐溶液中的平衡溶胀率比二价阳离子溶液中的更高.

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-Fiek diffusion behavior at 20 ℃. The P（AM- co-AA） hydrogel is responsive to the pH and salts, and it has excellent on-off switching behavior as reversible swelling and deswelling at pH 6.4 and 2.0. In addition, the equilibrium swelling ratio of univalent cation salt solution is higher than that of bivalent cation salt solution.