Swelling equilibria and volume phase transition in hydrogels with strongly dissociating electrolytes
Swelling equilibria and volume phase transition in hydrogels with strongly dissociating electrolytes
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DOI：
10.1021/ma00081a033
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发表时间：
1994-05
期刊：
影响因子：
5.5
通讯作者：
Zhen Tong;Xinxing Liu
中科院分区：
文献类型：
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作者：
Zhen Tong;Xinxing Liu
以N,N'-亚甲基双丙烯酰胺(BIS)为交联剂，N,N-二甲基丙烯酰胺(DMAA)和2-丙烯酰胺基-2-甲基丙磺酸(AMPS)进行自由基共聚制备了几种磺酸共聚物凝胶。预凝胶溶液的浓度和干凝胶中的BIS含量分别保持恒定在0.75 mol/L和1.3 mol%，而通过元素分析确定的干凝胶中AMPS的摩尔分数f在0到0.608之间变化。我们的样品的溶胀比为 f= 0.468，与 f= 0.494 的丙烯酸共聚物凝胶在 25°C、pH= 2 至 pH= 10、离子强度为 0.01 M 的水性缓冲液中的溶胀比进行了比较，结果表明，即使在凝胶状态，磺酸基团也可以在整个 pH 范围内完全解离。
Several sulfonic acid copolymer gels were prepared by radical copolymerization of N,N-dimethylacrylamide (DMAA) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) using N,N'-methylenebisacrylamide (BIS) as the cross-linker. The concentration of pregel solutions and BIS content in dried gels were held constant at 0.75 mol/L and 1.3 mol%, respectively, while the mole fraction f of AMPS in dried gels determined by elemental analysis varied from 0 to 0.608. Swelling ratios for our sample of f= 0.468 were compared with those for an acrylic acid copolymer gel of f= 0.494 and 25°C in aqueous buffers from pH= 2 to pH= 10 at 0.01 M ionic strength, and the results indicated that even in the gel state the sulfonic acid group could dissociate completely in the whole pH range