PAA-Na/PVA半互穿网络水凝胶的离子强度及pH敏感性  

Ionic strength and pH sensitivity of/sodium polyacrylate/poly(vinyl alcohol) semi-interprenetrating network hygrogels

作　　者：刘翠云[1] 姚大虎[1] 陈权[1] 张玉清[1] 

机构地区：[1]河南科技大学高分子科学与纳米重点实验室,洛阳471003

出　　处：《化工新型材料》2012年第7期97-99,共3页New Chemical Materials

基　　金：河南省基础与前沿技术研究(112300410208)

摘　　要：采用水溶液聚合法制备了聚丙烯酸钠(PAA-Na)/聚乙烯醇(PVA)半互穿网络水凝胶,研究了水凝胶在不同pH溶液、不同浓度NaCl与CaCl2溶液中的溶胀行为,结果表明,溶胀比随丙烯酸含量增大而增加,在碱性溶液中的溶胀度明显高于酸性溶液,溶胀平衡凝胶在酸性及碱性条件下均出现收缩,在pH=2和pH=12溶液中反复交换时,表现出可逆溶胀-退溶胀性能,具有较好的pH敏感性,凝胶在不同浓度NaCl与CaCl2溶液中溶胀性表明,溶液的离子强度及阳离子的电荷数对凝胶溶胀行为有较大影响。Sodium polyacrylate/poly（vinyl alcohol） semi-interpenetrating network hydrogels were synthesized by aqueous polymerization. The swelling behaviors of hygrogels were studied at different pH solutions and different NaCl, CaCl2 solutions. The results showed that the swelling ratio of the prepared hydrogels increased with the contents of acrylic acid improved and the swelling ratio was higher in acid solutions than that in alkaline solutions . The hydrogels with ab- sorbed water in equilibrium can be deswelled in both acid and alkaline solutions. When the hydrogels were shifted between solutions with pH= 2 and pH= 12, the hydrogels displayed rapid reversible swelling-deswelling property and exhibited sig- nificant pH-sensitivity. The swelling behaviors of hydrogels in different concentrations indicated that ionic strength and cat- ionic charge had drastically influences on the swelling behaviors .

关 键 词：聚丙烯酸钠 聚乙烯醇 PH敏感性 离子强度 溶胀-退溶胀 

分 类 号：O648.17[理学—物理化学]