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通过自由基聚合反应制备出以芦苇半纤维素为基材的温度/pH双重敏感性水凝胶材料。考察不同单体丙烯酸(AA)和N-异丙基丙烯酰胺(NIPAAm)摩尔比对其温度和pH的响应能力,探讨水凝胶的形成机制和消溶胀动力学行为。结果表明,四种不同单位摩尔比水凝胶均具有温度和pH双重敏感性,NIPAAm摩尔比含量高的水凝胶对温度响应更为敏感,而结构中的AA对水凝胶pH敏感行为起主要作用,消溶胀动力学符合准一级模型,消溶胀速率随NIPAAm摩尔比增加而加大。
A temperature / pH dual sensitive hydrogel material based on reed hemicellulose was prepared by free radical polymerization. The responsiveness of different monomer acrylic acid (AA) and N-isopropylacrylamide (NIPAAm) molar ratio to temperature and pH was investigated. The formation mechanism of hydrogel and the deswelling kinetics were discussed. The results show that the four different molar ratios of hydrogels have dual temperature and pH sensitivity, and the hydrogels with high molar ratio of NIPAAm are more sensitive to the temperature response, while the structural AA is sensitive to the pH of the hydrogel The main role of deswelling kinetics consistent with quasi-first-class model, deswelling rate increases with increasing NIPAAm molar ratio.