Abstract
A methodological approach towards assessing the conducting, diffusion, and selective properties of perfluorinated membranes MF-4SK and also their composites with polyaniline (PANi/MF-4SK) is presented. Studying these properties in NaCl and H2SO4 solutions makes it possible to elucidate the role played by the nature of counter-ions and co-ions in the charge and mass transfer. It is shown that both individual and composite membranes in their protonic forms are highly selective and, on average, have a conductivity that is higher by a factor of 3.5 as compared with their sodium forms. In contrast, the diffusion permeability is 4-times lower, in line with variation in the charge of the ions that define the mass transfer (co-ions Cl− or HSO −4 ). Within the framework of model assumptions on the structure of ion-exchange membranes, the transport and structure parameters of MF-4SK and PANi/MF-4SK are determined in H2SO4 solutions for a PANi-saturation of 25%. It is found that aromatic PANi chains localized in aqueous clusters of the template inhibit the diffusion transfer through the PANi/MF-4SK films, whereas the conductivity and transport numbers of PANi/MF-4SK in both NaCl and H2SO4 remain virtually unchanged.
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Original Russian Text © N.P. Berezina, A.A.-R. Kubaisi, 2006, published in Elektrokhimiya, 2006, Vol. 42, No. I, pp. 91–99.
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Berezina, N.P., Kubaisi, A.A.R. Peculiarities of electrotransport characteristics of composite membranes PANi/MF-4SK in sulfuric acid solutions. Russ J Electrochem 42, 81–88 (2006). https://doi.org/10.1134/S1023193506010137
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DOI: https://doi.org/10.1134/S1023193506010137