Ion exchange composite material based on proton conductive...

H - Electricity – 01 – M

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H01M 8/10 (2006.01) B01D 71/06 (2006.01) C08J 5/22 (2006.01) C08K 9/02 (2006.01) C08K 9/04 (2006.01) C08L 71/10 (2006.01) C08L 73/00 (2006.01) H01B 1/06 (2006.01) H01M 8/02 (2006.01)

Patent

CA 2480345

The composite material comprises acid functionalized silica dispersed in a polymer matrix that is based on poly(aromatic ether ketones), or poly(benzoyl phenylene), or derivatives thereof. The composite material is characterized by good water retention capabilities due to the acidic functions and the hydrophilicity of the silica particles. Moreover, a good impermeability to gas and liquid fuels commonly used in fuel cell technology, like hydrogen gas or methanol solution, is also obtained due to the presence of silica particles. Good mechanical properties of the composite material let the material to be formed easily in thin film or membrane form. In that form, the composite material is usable for proton exchange membrane for fuel cells, for drying or humidifying membrane for gas or solvent conditioning, or as acid catalytic membrane.

L'invention concerne un matériau composite comprenant de la silice à fonction acide dispersée dans une matrice polymère à base de poly(éther-cétones aromatiques) ou de poly(benzoyl-phénylène), ou de dérivés de ceux-ci. Ce matériau composite se caractérise par une bonne capacité de rétention d'eau grâce aux fonctions acides et au caractère hydrophile des particules de silice. La présence des particules de silice permet également d'obtenir une bonne imperméabilité aux gaz et aux combustibles liquides utilisés habituellement dans la technologie des piles à combustible, tels que le gaz hydrogène ou les solutions de méthanol. Les bonnes propriétés mécaniques de ce matériau composite permettent de le façonner facilement sous forme de film mince ou de membrane. Il peut ensuite être utilisé sous cette forme comme membrane échangeuse de protons dans des piles à combustible, comme membrane de séchage ou d'humidification pour le conditionnement de gaz ou de solvants ou comme membrane catalytique acide.

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