Nanocomposite anion exchange membranes were synthesized based on poly(sulfone trimethylammonium) chloride. A hybrid semi-interpenetrating silica network containing a large amount of quaternary ammonium groups was prepared by two sol–gel routes, in situ with a single precursor, N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride (TMSP), or ex situ mixing two precursors, TMSP and 3-(2-aminoethylamino)propyldimethoxy-methylsilane (AEAPS). The properties of these hybrid composites and their degradation after immersion in 1 M KOH at 60 °C were studied. The degradation is reduced in the composite materials with a lower decrease in the ion exchange capacity. FTIR spectra showed that a main degradation mechanism with a single precursor TMSP is the dissolution of the hybrid silica network in KOH, whereas it is stable with the mixture of TMSP/AEASP. This conclusion is in agreement with the thermogravimetric analysis. The mechanical properties show a better ductility with a single precursor and higher stiffness and strength, but less ductility, by the ex situ route. The activation energy was between 0.25 and 0.14 eV for Cl and OH ion conduction, respectively, consistent with the migration mechanism.

Sgreccia, E., Di Vona, M.l., Antonaroli, S., Ercolani, G., Sette, M., Pasquini, L., et al. (2021). Nanocomposite anion exchange membranes with a conductive semi-interpenetrating silica network. MEMBRANES, 11(4) [10.3390/membranes11040260].

Nanocomposite anion exchange membranes with a conductive semi-interpenetrating silica network

Sgreccia, Emanuela
;
Di Vona, Maria Luisa;Antonaroli, Simonetta;Ercolani, Gianfranco;Sette, Marco;
2021-01-01

Abstract

Nanocomposite anion exchange membranes were synthesized based on poly(sulfone trimethylammonium) chloride. A hybrid semi-interpenetrating silica network containing a large amount of quaternary ammonium groups was prepared by two sol–gel routes, in situ with a single precursor, N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride (TMSP), or ex situ mixing two precursors, TMSP and 3-(2-aminoethylamino)propyldimethoxy-methylsilane (AEAPS). The properties of these hybrid composites and their degradation after immersion in 1 M KOH at 60 °C were studied. The degradation is reduced in the composite materials with a lower decrease in the ion exchange capacity. FTIR spectra showed that a main degradation mechanism with a single precursor TMSP is the dissolution of the hybrid silica network in KOH, whereas it is stable with the mixture of TMSP/AEASP. This conclusion is in agreement with the thermogravimetric analysis. The mechanical properties show a better ductility with a single precursor and higher stiffness and strength, but less ductility, by the ex situ route. The activation energy was between 0.25 and 0.14 eV for Cl and OH ion conduction, respectively, consistent with the migration mechanism.
2021
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/05 - SCIENZA E TECNOLOGIA DEI MATERIALI POLIMERICI
Settore CHIM/07 - FONDAMENTI CHIMICI DELLE TECNOLOGIE
Settore CHIM/06 - CHIMICA ORGANICA
English
polysulfone; sol–gel; ionomers; hybrid materials
Sgreccia, E., Di Vona, M.l., Antonaroli, S., Ercolani, G., Sette, M., Pasquini, L., et al. (2021). Nanocomposite anion exchange membranes with a conductive semi-interpenetrating silica network. MEMBRANES, 11(4) [10.3390/membranes11040260].
Sgreccia, E; Di Vona, Ml; Antonaroli, S; Ercolani, G; Sette, M; Pasquini, L; Knauth, P
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/272829
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