基于小麦秸秆纤维素的半互穿网络水凝胶的特性及溶胀-溶缩性能。
Characterization and swelling-deswelling properties of wheat straw cellulose based semi-IPNs hydrogel.
机构信息
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 250100 Jinan, PR China.
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 250100 Jinan, PR China.
出版信息
Carbohydr Polym. 2014 Jul 17;107:232-40. doi: 10.1016/j.carbpol.2014.02.073. Epub 2014 Mar 12.
A novel wheat straw cellulose-g-poly(potassium acrylate)/polyvinyl alcohol (WSC-g-PKA/PVA) semi-interpenetrating polymer networks (semi-IPNs) hydrogel was prepared by polymerizing wheat straw and an aqueous solution of acrylic acid (AA), and further semi-interpenetrating with PVA occurred during the chemosynthesis. The swelling and deswelling properties of WSC-g-PKA/PVA semi-IPNs hydrogel and WSC-g-PKA hydrogel were studied and compared in various pH solutions, salt solutions, temperatures, particle sizes and ionic strength. The results indicated that both hydrogels had the largest swelling capacity at pH=6, and the effect of ions on the swelling of hydrogels was in the order: Na(+)>K(+)>Mg(2+)>Ca(2+). The Schott's pseudo second order model can be effectively used to evaluate swelling kinetics of hydrogels. Moreover, the semi-IPNs hydrogel had improved swelling-deswelling properties compared with that of WSC-g-PKA hydrogel.
一种新型的小麦秸秆纤维素-g-聚丙烯酸钾/聚乙烯醇（WSC-g-PKA/PVA）半互穿聚合物网络（semi-IPNs）水凝胶是通过聚合小麦秸秆和丙烯酸（AA）的水溶液，并在化学合成过程中与 PVA 进一步发生半互穿而制备的。研究并比较了 WSC-g-PKA/PVA 半互穿聚合物网络水凝胶和 WSC-g-PKA 水凝胶在不同 pH 值溶液、盐溶液、温度、粒径和离子强度下的溶胀和溶胀性能。结果表明，两种水凝胶在 pH=6 时具有最大的溶胀能力，离子对水凝胶溶胀的影响顺序为：Na(+)>K(+)>Mg(2+)>Ca(2+)。Schott 拟二级动力学模型可有效评价水凝胶的溶胀动力学。此外，与 WSC-g-PKA 水凝胶相比，半互穿聚合物网络水凝胶具有改善的溶胀-溶胀性能。
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