Swelling behavior of poly(acrylamide-co-sodium acrylate) hydrogels in aqueous salt solutions: theory versus experiments
Swelling behavior of poly(acrylamide-co-sodium acrylate) hydrogels in aqueous salt solutions: theory versus experiments
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DOI：
10.1016/s0014-3057(99)00058-0
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发表时间：
2000-02-01
影响因子：
6
通讯作者：
Sariisik, SB
中科院分区：
文献类型：
--
作者：
Okay, O;Sariisik, SB
将Flory-Rehner膨胀平衡理论（包括理想Donnan平衡）的预测结果与聚丙烯酰胺-丙烯酸钠水凝胶在水和盐溶液中膨胀的实验数据进行了比较。为了进行比较，考虑了在凝胶膨胀中有效的反离子的比例。以丙烯酰胺和丙烯酸钠（NaAc）单体为原料，NaAc用量为0 ~ 5 mol%，N，N′-亚甲基双（丙烯酰胺）为交联剂，制备了离子水凝胶。在一定交联剂比下，当NaAc的摩尔作用增大或外溶液NaCl浓度降低时，水凝胶在水中的体积膨胀比急剧增大。考虑到水凝胶中浪费的反离子，该理论正确地预测了水凝胶在水和盐水溶液中的溶胀行为。该理论没有预测到的是，当盐浓度从10（-1）增加到10(0)m时，NaAc含量低于4 mol%的水凝胶的溶胀率增加。版权所有。
The predictions of the Flory-Rehner theory of swelling equilibrium including the ideal Donnan equilibria were compared with the experimental swelling data obtained from poly(acrylamide-co-sodium acrylate) hydrogels swollen in water and in aqueous salt (NaCl) solutions. For this comparison, the fraction of counterions which are effective in the gel swelling was taken into account. The ionic hydrogels were prepared from acrylamide and sodium acrylate (NaAc) monomers with 0 to 5 mol% NaAc and using N,N'-methylenebis(acrylamide) as the crosslinker: As expected. at a fixed crosslinker ratio, the volume swelling ratio of hydrogels in water increases sharply when the mole fi action of NaAc increases or the NaCl concentration in the external solution decreases. Taking into account the wasted counterions within the hydrogels, the theory correctly predicts the swelling behavior of hydrogels in water and in aqueous salt solutions, Not predicted by the theory is the increased swelling ratio of hydrogels with less than 4 mol% NaAc content with increasing salt concentration from 10(-1) to 10(0) M. (C) 1999 Elsevier Science Ltd. All rights reserved.