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高分子学报 2015

二茂铁接枝聚丙烯酰胺水溶液的流变行为研究

DOI: 10.11777/j.issn1000-3304.2015.14219, PP. 120-126

江志平,上官勇刚,郑强

Keywords: 聚丙烯酰胺,二茂铁,流变行为,氧化还原聚合物

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Abstract:

采用"Post-Modification"技术在二甲基亚砜中直接对聚丙烯酰胺进行烷基化反应,接枝二茂铁官能团(Fc),制备出一种具有氧化还原性质的二茂铁改性聚丙烯酰胺(PAM-Fc).通过红外光谱(FTIR)、核磁氢谱(1H-NMR)、热失重(TGA)、电化学、动态流变测试等方法对PAM-Fc的化学结构、电化学活性和流变特性进行了表征.研究结果表明,PAM-Fc具有氧化还原性,相比PAM呈现更好的热稳定性,这主要源于Fc基团稳定了PAM分子链的自由基.Fc基团在水溶液中的疏水缔合作用会导致体系黏度显著增大.通过添加NaCl、β-环糊精或H2O2等可以对PAM-Fc水溶液的黏度进行有效调控.其中,NaCl可以屏蔽PAM-Fc分子链上的电荷,β-环糊精能够包合Fc基团,H2O2则可将疏水的还原态Fc基团氧化成亲水的氧化态Fc,从而实现PAM-Fc水溶液流变行为的调节.

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