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Electrochemical properties of ion-exchange membranes based on sulfonated EPDM-polypropylene blends

AuthorsCompañ, Vicente; Fernández-Carretero, F. J.; Riande, Evaristo
Keywordspolymer blends
compression moulding
ion exchange
ionic conductivity
Issue Date2007
PublisherElectrochemical Society
CitationJournal of Electrochemical Society 154 (2) : B159-B164 (2007)
AbstractThe preparation of cation-exchange membranes by compression molding of sulfonated EPDM-polypropylene blends is described. Concentration potentials measured in a two-compartmental cell with configuration Formula solution Formula membrane∕ Formula solution Formula Formula ., are a linear function of Formula (=Formula , where Formula and Formula are, respectively, the concentration and activity coefficient of the solution in compartment 2 keeping constant the concentration in compartment 1, Formula . The values of the proton transport numbers, Formula , decrease from 0.99 to 0.94 when the ratio Formula increases from 0.1 to 5, nearly the same decrease reported for Nafion 117 in the same variation of concentration ratios. Proton conductivities at Formula are Formula and Formula , respectively, for water-saturated membranes containing 20 and 10% of polypropylene, more than one decade below the value reported in the literature for the conductivity of Nafion membranes at the same temperature. These conductivities at Formula amount to Formula and Formula , respectively
Publisher version (URL)http://dx.doi.org/10.1149/1.2398818
Appears in Collections:(ICTP) Artículos
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