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Polymerization of aniline in perfluorinated membranes under conditions of electrodiffusion of monomer and oxidizer
Journal of Solid State Electrochemistry ( IF 2.5 ) Pub Date : 2019-12-17 , DOI: 10.1007/s10008-019-04463-7
Marina Andreeva , Natalia Loza , Natalia Kutenko , Natalia Kononenko

A series of composites based on the perfluorinated MF-4SK membrane and polyaniline was obtained under electrodiffusion of monomer and oxidizer. Aniline was used as monomer and potassium dichromate as oxidizer. Chronopotentiometry was proposed as the method of monitoring the formation of polyaniline in the near-surface layer of the membrane. The electronic absorption spectra of the composites and optical microphotographs of the surfaces were obtained right after membrane modification. A combined interpretation of results revealed the following stages: the accumulation of monomer in the reaction space accompanied by the onset of polymerization, the polymerization with a subsequent increase in rate, and the formation of modifier layer on the membrane surface. The polarization behavior of composite membranes was studied using voltammetry. It was shown that the presence of two limiting currents (pseudo-limiting and limiting) on the current-voltage curves when the composite was oriented with a polyaniline layer to the counterion flow but only for membranes obtained at synthesis times more than 35 min. Also for these composite membranes, no plateau of the limiting current on the current-voltage curve was observed in the case of reverse membrane orientation. But at the same time, the fluctuations of potential drop on the current-voltage curve indicated the overlimiting state of electromembrane system. A correlation between the shape of the chronopotentiogram recorded during membrane modification and the polarization behavior of the obtained composites was found.



中文翻译:

单体和氧化剂电扩散条件下全氟膜中苯胺的聚合

在单体和氧化剂的电扩散作用下,得到了一系列基于全氟化MF-4SK膜和聚苯胺的复合材料。苯胺用作单体,重铬酸钾用作氧化剂。提出采用计时电位法作为监测膜近表面层中聚苯胺形成的方法。膜改性后立即获得复合材料的电子吸收光谱和表面的光学显微照片。对结果的综合解释揭示了以下阶段:单体在反应空间中的积累伴随着聚合的开始,聚合以及随后速率的增加以及在膜表面上形成改性剂层。用伏安法研究了复合膜的极化行为。结果表明,当复合物通过聚苯胺层与抗衡离子流取向时,电流-电压曲线上存在两个限制电流(伪限制和限制),但仅限于合成时间超过35分钟时获得的膜。同样对于这些复合膜,在反向膜取向的情况下,在电流-电压曲线上没有观察到极限电流的平稳状态。但同时,电流-电压曲线上电位降的波动表明了电膜系统的超限状态。发现在膜改性期间记录的计时电位图的形状与所得复合材料的极化行为之间的相关性。

更新日期:2019-12-17
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