The hydration in liquid water of various thermally treated SPEEK membranes was determined and confronted with data in saturated water vapor. Significant differences, which correspond to the so-called Schröder paradox, are observed only in un-crosslinked ionomers with IEC>2. eq/kg. After cation exchange in electrolyte solutions (2 and 0.1. mol/L), the hydration and density of the ionomers was determined and confronted with a physical model. There is no clear correlation with cation properties, such as ionic radius or Robinson-Stokes hydration numbers. The ionic conductivity ranges from 3mS/cm for K, NH4 and Mg-exchanged membranes to 0.6mS/cm for Ca and Zn. Although the latter might be related to ionic cross-linking by the divalent cations, the relatively high conductivity of Mg ions might be useful for electrochemical applications.

Narducci, R., DI VONA, M.l., Knauth, P. (2014). Cation-conducting ionomers made by ion exchange of sulfonated poly-ether-ether-ketone: Hydration, mechanical and thermal properties and ionic conductivity. JOURNAL OF MEMBRANE SCIENCE, 465, 185-192 [10.1016/j.memsci.2014.03.073].

Cation-conducting ionomers made by ion exchange of sulfonated poly-ether-ether-ketone: Hydration, mechanical and thermal properties and ionic conductivity

Narducci, R;DI VONA, MARIA LUISA;
2014-01-01

Abstract

The hydration in liquid water of various thermally treated SPEEK membranes was determined and confronted with data in saturated water vapor. Significant differences, which correspond to the so-called Schröder paradox, are observed only in un-crosslinked ionomers with IEC>2. eq/kg. After cation exchange in electrolyte solutions (2 and 0.1. mol/L), the hydration and density of the ionomers was determined and confronted with a physical model. There is no clear correlation with cation properties, such as ionic radius or Robinson-Stokes hydration numbers. The ionic conductivity ranges from 3mS/cm for K, NH4 and Mg-exchanged membranes to 0.6mS/cm for Ca and Zn. Although the latter might be related to ionic cross-linking by the divalent cations, the relatively high conductivity of Mg ions might be useful for electrochemical applications.
2014
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/07 - FONDAMENTI CHIMICI DELLE TECNOLOGIE
Settore CHIM/03 - CHIMICA GENERALE E INORGANICA
English
Con Impact Factor ISI
Cation conduction; Polymer electrolytes; Schroder paradox; Water uptake
Narducci, R., DI VONA, M.l., Knauth, P. (2014). Cation-conducting ionomers made by ion exchange of sulfonated poly-ether-ether-ketone: Hydration, mechanical and thermal properties and ionic conductivity. JOURNAL OF MEMBRANE SCIENCE, 465, 185-192 [10.1016/j.memsci.2014.03.073].
Narducci, R; DI VONA, Ml; Knauth, P
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/118762
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