Superabsorbent hydrogels from poly(aspartic acid) with salt-, temperature- and pH-responsiveness properties
Superabsorbent hydrogels from poly(aspartic acid) with salt-, temperature- and pH-responsiveness properties
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DOI：
10.1016/j.polymer.2005.04.015
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发表时间：
2005-06-27
期刊：
影响因子：
4.6
通讯作者：
Tan, TW
中科院分区：
文献类型：
--
作者：
Zhao, Y;Su, HJ;Tan, TW
以聚丁二酰亚胺（PSI）为原料，采用化学交联法合成了聚天冬氨酸（PAsp）树脂。研究了PSI浓度、反应终点pH值等反应变量对树脂吸水性能的影响。根据结构参数对这些现象进行了讨论，并通过扫描电镜进行了证实。比较了水凝胶在最终pH 8和10下的吸水性。吸水能力随着终端pH值的增加和PSI浓度的降低而增强。研究了高吸水性水凝胶的溶胀/去溶胀动力学。结果表明，该水凝胶具有两性和可逆的pH响应性。根据水凝胶的物理化学结构，将其吸水性的变化归因于溶胀理论。溶胀对温度、离子强度和阳离子种类也极其敏感。水凝胶的可逆pH响应性、盐敏感性和温度敏感性使这种智能化聚合物具有更广泛的应用。(c)2005爱思唯尔有限公司保留所有权利。
Polyaspartic acid (PAsp) resin was synthesized by polysuccinimide (PSI), through chemical cross-linking using the cross-linking agent (diamine). The effects of reaction variables, such as PSI concentration and terminal pH on the water absorbent capacity have been studied. These phenomena were discussed according to structural parameters, which were confirmed by SEM. Water absorbencies were compared for the hydrogels at terminal pH 8 and 10. The water absorbent capacity enhanced with increasing terminal pH and decreasing PSI concentration. The swelling/deswelling kinetics of the super-absorbent hydrogels was investigated as well. It is found that the hydrogels showed ampholytic and reversible pH-responsiveness properties. The variational water absorbencies were attributed to swelling theory based on the hydrogel physical and chemical structure. The swelling was also extremely sensitive to the temperature, ionic strength and cationic kind. The reversible pH-responsiveness, salt- and temperature-sensitivity of the hydrogels make this intelligentized polymer had wider applications. (c) 2005 Elsevier Ltd. All rights reserved.