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Elaboration de membranes pour piles a combustible par extrusion

Abstract : The aim of these studies was to process membranes by extrusion to be used in fuel cells. The functional polymers used are generally processed by polluting techniques like casting-evaporation, which are not easily transposable on industrial scale. Extrusion is a widely used shaping operation in the polymer processing industry. However, extrusion had not been used until now for arylsulfonic ionic polymers. In order to avoid any risk of degradation of the polymer during extrusion, it was necessary to define the best processing conditions. On one hand, the physicochemical characterization of the polysulfones (commercial) and sulfonated polysulfones (or synthesized by the project partners), were performed by determining their molecular weights and their thermal transitions. On the order hand, their flow behaviour was characterized over a wide range of temperatures and shearing rates using rheometric techniques. The combination of these two characterizations allowed to define the appropriate extrusion conditions. For the extruded films, the conductivities, measured by impedance spectroscopy were found to be similar with those of the membranes processed by casting-evaporation and close to those of Nafion® membranes. In addition, the incorporation of a proton-conducting filler and reinforcing fibres was also considered and the extrusion of these composite materials was validated. This work could be extended to other proton-conducting polymers, like polyetherethercetones and polyetherimides, whose membranes produced by casting-evaporation have already shown their performances in the fuel cells.
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https://tel.archives-ouvertes.fr/tel-00442970
Contributor : France Chabert <>
Submitted on : Saturday, December 26, 2009 - 12:39:21 PM
Last modification on : Friday, November 6, 2020 - 4:04:51 AM
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  • HAL Id : tel-00442970, version 1

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CNRS | LRP | UGA

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France Chabert. Elaboration de membranes pour piles a combustible par extrusion. Génie des procédés. Institut National Polytechnique de Grenoble - INPG, 2004. Français. ⟨tel-00442970⟩

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