Conducting polyaniline prepared in the solutions of formic acid: Does functionalization with carboxyl groups occur?,Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

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Conducting polyaniline prepared in the solutions of formic acid: Does functionalization with carboxyl groups occur?
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.3 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.saa.2020.118300
Miroslava Trchová ₁ , Daniela Jasenská ₂ , Michal Bláha ₃ , Jan Prokeš ₄ , Jaroslav Stejskal ₅

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Polyaniline is a conducting polymer with an application potential in the field of biomedical engineering. By employing FTIR spectroscopy and conductivity measurements, it has been shown that the oxidation at stoichiometric peroxydisulfate-to-aniline mole ratio 1.25 in the solutions of formic acid in the range 0-10 M provides samples of a moderate conductivity of the orders 0.01-0.1 S cm-1. They consist of polyaniline and aniline oligomers as typical of the aniline oxidation in weak acids. The detailed investigation of the infrared spectra indicates a partial ring-carboxylation of polyaniline at high acid concentrations. The extent of structural defects is higher for a series prepared at over-stoichiometric peroxydisulfate-to-aniline mole ratio 2.5, which provided only non-conducting samples. The reference sample series represented by poly(aniline-co-o-aminobenzoic acid) was also prepared and is used in the discussion of the infrared spectra.

中文翻译：

传导在甲酸溶液中制备的聚苯胺：是否发生羧基官能化？

聚苯胺是一种导电聚合物，在生物医学工程领域具有应用潜力。通过使用FTIR光谱学和电导率测量，已经表明，在0-10 M范围内的甲酸溶液中，化学计量的过氧二硫酸盐与苯胺的摩尔比为1.25时，氧化可提供中等电导率的样品，约为0.01-0.1 S cm-1。它们由聚苯胺和苯胺低聚物组成，这是弱酸中苯胺氧化的典型特征。红外光谱的详细研究表明，在高酸浓度下，聚苯胺会发生部分环羧基化。对于以过化学计量的过氧二硫酸盐与苯胺的摩尔比2.5制备的系列，其结构缺陷的程度更高，该系列仅提供不导电的样品。

更新日期：2020-04-01

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