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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Na Cl、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,Na Cl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.
Using “Post-Modification” technology to directly alkylate polyacrylamide in dimethylsulfoxide, ferrocene functional group (Fc) was grafted to prepare a ferrocene with redox properties Polyacrylamide (PAM-Fc) was synthesized and characterized by FTIR, 1H-NMR, TGA, electrochemical and dynamic rheological methods. The chemical structure of PAM- Chemical activity and rheological properties were characterized.The results show that PAM-Fc has a redox compared with PAM showed better thermal stability, mainly due to the Fc group stabilizes the free radicals in the PAM molecular chain .Fc Hydrophobic interaction of groups in aqueous solution leads to a significant increase in the viscosity of the system, which can effectively control the viscosity of PAM-Fc aqueous solution by adding NaCl, β-cyclodextrin or H2O2, among which NaCl can shield PAM -Fc molecular chain charge, β-cyclodextrin can enclose the Fc group, H2O2 can be hydrophobic reduced Fc group oxidation into a hydrophilic oxidation state Fc, in order to achieve the rheological behavior of PAM-Fc aqueous solution adjust.