and Nanocomposite Ion Exchange Membranes
in Aqueous and Water
Methanol Solutions
V. Ch. Bokuna, D. A. Kritskayaa,z, E. F. Abdrashitova, A. N. Ponomareva, E. A. Sanginovb,
A. B. Yaroslavtsevc, and Yu. A. Dobrovol’skiib
aBranch of the Talroze Institute for Energy Problems of Chemical Physics of Russian Academy of Sciences,
pr. akademika Semenova 1, Chernogolovka, Moskovskaya Oblast’, 142432 Russia
bInstitute of Problems of Chemical Physics, Russian Academy of Sciences,
pr. akademika Semenova 1, Chernogolovka, Moskovskaya Oblast’, 142432 Russia
cKurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia
Received September 9, 2014
Abstract—The proton conductivity of commercial perfluorinated membranes Nafion-115, MF-4SC and syn-
thesized nanocomposite membranes (polyvinylidenefluoride–sulfonated polystyrene, ultra high molecular
weight polyethylene–sulfonated polystyrene, polypropylene–sulfonated polystyrene) is studied as a function of
concentration of the water–methanol solution sorbed by membranes, by means of contact impedancemetry with
the regulated pressure on the electrode–membrane contacts. The optimal experimental conditions are shown to
correspond to a pack of several membranes pressed between gold electrodes with the strength of no less than
40 kg/cm2. It is found that the specific conductivity of synthesized membranes in water at 24C is 50–120
mS/cm, which virtually coincides with the corresponding values for Nafion-115 and MF-4SC. As the concen-
tration of the water–methanol solution increases from 0 to 60%, the specific conductivity of Nafion-115 and
MF-4SC membranes decreases by 30%. The specific conductivity of synthesized nanocomposite membranes
decreases by 40–55% in this concentration range.
Keywords: ion-exchange membrane, ionic conductivity, composite membranes
DOI: 10.1134/S1023193515050031
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