Composite anion-conductingmembranes 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 behydrated at 60 Cwithout dissolution. CompositeswithDABCOhave slightly lower water uptakeand ionic conductivity thanthosewithTMA.Theirmechanical properties in fully humidified conditions are clearly enhanced with especially a nearly 3-fold increase of the Youngmodulus. 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 2e4mScm-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 cm1 under 95% RH.
Anionic conducting composite membranes based on aromatic polymer and layered double hydroxides
CASCIOLA, Mario;DONNADIO, Anna;NOCCHETTI, Morena;NARDUCCI, Riccardo;
2017
Abstract
Composite anion-conductingmembranes 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 behydrated at 60 Cwithout dissolution. CompositeswithDABCOhave slightly lower water uptakeand ionic conductivity thanthosewithTMA.Theirmechanical properties in fully humidified conditions are clearly enhanced with especially a nearly 3-fold increase of the Youngmodulus. 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 2e4mScm-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 cm1 under 95% RH.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
