Composite anion-conducting membranes were prepared from polysulfone with grafted quaternary ammonium groups and dispersed nanoparticles of layered double hydroxide (LDH) with composition Mg0.62Al0.38(OH)2(Cl)0.38·0.6H2O as inorganic filler. Two types of amines were used: small and flexible trimethylamine and bulky and rigid 1,4-diazabicyclo[2.2.2]octane (DABCO). The composite membranes have a distinctly lower water uptake and swelling and they can be hydrated at 60 °C without dissolution. Composites with DABCO have slightly lower water uptake and ionic conductivity than those with TMA. Their mechanical properties in fully humidified conditions are clearly enhanced with especially a nearly 3-fold increase of the Young modulus. In spite of their strongly reduced hydration, the conductivity of the composite membranes is comparable with that of the pristine ionomers, being in the range 2–4 mS cm−1 at 25 °C. Furthermore, the membranes can be treated in alkaline conditions at 60 °C without losing their properties and the ionic conductivity reaches 30 mS cm−1 under 95% RH.

DI VONA, M.l., Casciola, M., Donnadio, A., Nocchetti, M., Pasquini, L., Narducci, R., et al. (2017). Anionic conducting composite membranes based on aromatic polymer and layered double hydroxides. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 42(5), 3197-3205 [10.1016/j.ijhydene.2016.11.030].

Anionic conducting composite membranes based on aromatic polymer and layered double hydroxides

DI VONA, MARIA LUISA;PASQUINI, LUCA;NARDUCCI, RICCARDO;
2017-01-01

Abstract

Composite anion-conducting membranes were prepared from polysulfone with grafted quaternary ammonium groups and dispersed nanoparticles of layered double hydroxide (LDH) with composition Mg0.62Al0.38(OH)2(Cl)0.38·0.6H2O as inorganic filler. Two types of amines were used: small and flexible trimethylamine and bulky and rigid 1,4-diazabicyclo[2.2.2]octane (DABCO). The composite membranes have a distinctly lower water uptake and swelling and they can be hydrated at 60 °C without dissolution. Composites with DABCO have slightly lower water uptake and ionic conductivity than those with TMA. Their mechanical properties in fully humidified conditions are clearly enhanced with especially a nearly 3-fold increase of the Young modulus. In spite of their strongly reduced hydration, the conductivity of the composite membranes is comparable with that of the pristine ionomers, being in the range 2–4 mS cm−1 at 25 °C. Furthermore, the membranes can be treated in alkaline conditions at 60 °C without losing their properties and the ionic conductivity reaches 30 mS cm−1 under 95% RH.
2017
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
Ionomer; Hybrid; Polysulfone; Swelling; Mechanical properties; Conductivity
DI VONA, M.l., Casciola, M., Donnadio, A., Nocchetti, M., Pasquini, L., Narducci, R., et al. (2017). Anionic conducting composite membranes based on aromatic polymer and layered double hydroxides. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 42(5), 3197-3205 [10.1016/j.ijhydene.2016.11.030].
DI VONA, Ml; Casciola, M; Donnadio, A; Nocchetti, M; Pasquini, L; Narducci, R; Knauth, P
Articolo su rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/180577
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