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材料工程  2013 

壳聚糖基三元智能水凝胶的制备及其敏感性

DOI: 10.3969/j.issn.1001-4381.2013.03.013

Keywords: 壳聚糖(CS),聚乙烯吡咯烷酮(PVP),聚乙烯醇(PVA),智能水凝胶,温度敏感性,pH敏感性

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Abstract:

以戊二醛为交联剂,硝酸铈铵为引发剂,在壳聚糖(CS)/聚乙烯基吡咯烷酮(PVP)二元凝胶的基础上,通过引入聚乙烯醇(PVA),制备了具有温度和pH双重敏感性的CS基三元智能水凝胶。结果表明,PVA的引入可显著提高CS在体系中的用量,增加凝胶的温度敏感级数,增强敏感度。在PVA用量为6.25%(相对于PVP的质量分数,下同),0.4%交联剂,5.1%引发剂,80℃下反应6h的条件下,可获得最大溶胀率约为1500%的三元凝胶。CS基三元凝胶在实验考察的温度范围内具有四级温度敏感性,且在35℃附近有一显著敏感点;对不同的pH值具有较好的敏感性,敏感突变点在pH=2附近。

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