Investigation of pseudo-polyanion formation between polyvinylpyrrolidone and sodium dodecanoate in aqueous solution by capillary electrophoresis, conductometry, tensiometry and calcium stability
Investigation of pseudo-polyanion formation between polyvinylpyrrolidone and sodium dodecanoate in aqueous solution by capillary electrophoresis, conductometry, tensiometry and calcium stability
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DOI：
10.1039/c6ra26629k
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发表时间：
2017-01
期刊：
影响因子：
3.9
通讯作者：
Yefan Wu;Miaomiao Chen;Yun Fang;Wangsong Wang
中科院分区：
文献类型：
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作者：
Yefan Wu;Miaomiao Chen;Yun Fang;Wangsong Wang
由于缺乏关于非离子聚合物与弱电解质型阴离子表面活性剂之间缔合的信息，因此首次通过毛细管电泳研究了聚乙烯吡咯烷酮（PVP）与十二酸钠（SD）之间的络合，并辅助电导测定、张力测定和钙稳定性。实验结果表明，多种方法测定的体系临界聚集浓度（cac）和聚合物饱和点（psp）值基本一致。首次发现PVP-SD复合物实际上是PVP-SD伪聚阴离子，具有不同pH值对应的不同电荷密度。研究还发现，PVP 和结合的 SD 胶束之间的氢键和抗衡离子桥联在 PVP-SD 假聚阴离子的自组装中发挥着重要作用，并且假聚阴离子的 pH 依赖性毛细管电泳行为归因于钠桥联在较低 pH 下被氢键取代。
There is a lack of information about association between nonionic polymers and weak electrolyte type anionic surfactants, therefore the complexation between polyvinylpyrrolidone (PVP) and sodium dodecanoate (SD) is investigated by capillary electrophoresis for the first time, in assistance with conductometry, tensiometry and calcium stability. The experimental results show that values of critical aggregation concentration (cac) and polymer saturation point (psp) of the system determined by several methods are consistent with each other. It is firstly found that the PVP–SD complex is actually PVP–SD pseudo-polyanions with different charge densities corresponding to different pH levels. It is also found that H-bonding and counterion bridging between PVP and bound SD micelles play important roles in the self-assembling of the PVP–SD pseudo-polyanions, and the pH-dependent capillary electrophoresis behavior of the pseudo-polyanions is ascribed to sodium bridging being replaced by H-bonding at lower pH.