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Crosslinked SPEEK membranes: Mechanical, thermal, and hydrothermal properties

Published online by Cambridge University Press:  07 June 2012

Hongying Hou
Affiliation:
Laboratoire Chimie Provence (UMR 6264), Centre St Jérôme, Aix-Marseille Univ - CNRS, 13397 Marseille, France
Brunella Maranesi
Affiliation:
Laboratoire Chimie Provence (UMR 6264), Centre St Jérôme, Aix-Marseille Univ - CNRS, 13397 Marseille, France; and Dip. Scienze e Tecnologie Chimiche, Univ Roma Tor Vergata, 00133 Roma, Italy
Jean-François Chailan
Affiliation:
Univ Sud Toulon-Var, MAPIEM (EA 3834), 83402 La Garde, France
Mustapha Khadhraoui
Affiliation:
Laboratoire Chimie Provence (UMR 6264), Centre St Jérôme, Aix-Marseille Univ - CNRS, 13397 Marseille, France
Riccardo Polini
Affiliation:
Dip. Scienze e Tecnologie Chimiche, Univ Roma Tor Vergata, 00133 Roma, Italy
Maria Luisa Di Vona
Affiliation:
Dip. Scienze e Tecnologie Chimiche, Univ Roma Tor Vergata, 00133 Roma, Italy
Philippe Knauth*
Affiliation:
Laboratoire Chimie Provence (UMR 6264), Centre St Jérôme, Aix-Marseille Univ - CNRS, 13397 Marseille, France
*
b)Address all correspondence to this author. e-mail: philippe.knauth@univ-amu.fr
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Abstract

The thermal and mechanical behavior, the water uptake (WU), and water diffusion coefficient of sulfonated poly(ether ether ketone) (SPEEK) membranes annealed at 180 °C for different times were explored by high-resolution thermogravimetric analysis, mechanical tensile tests, dynamic mechanical analysis, and WU measurements. The mechanical and thermal stability increased with the thermal treatment time, i.e., with the degree of crosslinking. The effect of residual casting solvent, dimethyl sulfoxide (DMSO), on the WU within SPEEK was probed. In presence of residual DMSO, crosslinked SPEEK exhibited higher water sorption at low and medium relative humidity (RH), and lower water sorption at high RH. These membranes have properties well adapted to fuel cell applications.

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Articles
Copyright
Copyright © Materials Research Society 2012

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