Acid-base proton conducting polymer blend membrane

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/22 (2006.01) C08J 5/20 (2006.01) C25B 13/08 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2473907

An acid-base proton conducting polymer blend membrane is provided. The acid- base proton conducting polymer blend membrane comprises a first acidic polymer having acidic subunits, a second basic polymer having basic subunits, and a third polymer containing one or more functional units for improving membrane conductivity, flexibility, water remaining ability, dimension stability, and methanol crossover. In one embodiment, the acid-base polymer blend membrane of the present invention comprises a first acidic polymer having acidic subunits, a second basic polymer having basic subunits, wherein at least one of the first acidic and second basic polymer comprises one or more functional units to improve the properties of the membrane. The functional units include hydrophilic units, adhesion promoter units, methanol block units, dimensional stabilizer units, and flexible units.

L'invention concerne une membrane à base d'un mélange polymère, conductrice de protons, acido-basique qui renferme un premier polymère acide à sous-unités acides, un second polymère basique à sous-unités basiques, et un troisième polymère contenant au moins une unité fonctionnelle de manière à améliorer la conductivité, la flexibilité, la capacité de rétention d'eau, la stabilité dimensionnelle et la transition du méthanol de la membrane. Dans un mode de réalisation, ladite membrane du mélange polymère acido-basique de cette invention contient un premier polymère acide à sous-unités acides, un second polymère basique à sous-unités basiques, au moins un polymère parmi le premier polymère acide et le second polymère basique renfermant au moins une unité fonctionnelle pour améliorer les propriétés de la membrane. Ces unités fonctionnelles comprennent des unités hydrophiles, des unités favorisant l'adhésion, des unités de séquences du méthanol, des unités de stabilisation dimensionnelle, et des unités flexibles.

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