Peculiarities of Electrotransport Characteristics
of Composite Membranes PANi/MF-4SK
in Sulfuric Acid Solutions

N. P. Berezina^z and A. A.-R. Kubaisi

Kuban State University, ul. Stavropol’skaya 149, Krasnodar, 340040 Russia

Received January 11, 2005

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 compos-
ite 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 H). 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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