Abstract: A super water absorbent resin was synthesized by means of aqueous solution polymerization from etherificated sodium alginate, acrylic acid and polyvinyl alcohol，with N, N′-methylenebisacrylamide as crosslinking agent, (NH₄)₂S₂O₈-NaHSO₃ as initiator.The equilibrium water contents of the resin in various pH buffer solutions and saline solution were determinated and compared.In acidic solution, the swelling of the water absorbent resin was controlled by —COO^- protonation and followed non-Fickian transport.In alkaline solution,the swelling was controlled by solvent diffusion and followed Fickian transport.When the pH of solution was increased,the equilibrium water content of the resin increased.When ionic strength was close to each other, water absorbency in various pH buffer solutions was relatively lower than that in monovalent metal saline solutions but higher than that in divalent metal saline solutions.The mechanism of resin-solvent interaction was also studied.

Key words: 高吸水树脂, 缓冲溶液, 盐溶液, 溶胀性能, 扩散

摘要： 以N，N-亚甲基双丙烯酰胺为交联剂，过硫酸铵-亚硫酸氢钠为引发剂，采用水溶液法合成了醚化海藻酸钠-丙烯酸-聚乙烯醇高吸水性树脂.考察比较了树脂在不同pH值缓冲溶液和盐溶液中的平衡含水率.结果表明，在酸性介质中，凝胶的溶胀过程为—COO^-的质子化过程控制,溶胀过程表现出non-Fickian动力学行为; 在碱性介质中，溶胀过程主要由溶剂扩散控制,表现出Fickian动力学行为，随着pH值升高，凝胶的平衡含水率升高; 在离子强度相近时，树脂在pH缓冲溶液中的溶胀率比在单价盐离子溶液中低，但比在二价盐溶液中高.对聚合物-溶剂的相互作用机理进行了探讨.

关键词: 高吸水树脂, 缓冲溶液, 盐溶液, 溶胀性能, 扩散