Process for producing polymeric films for use as fuel cells

Details Process for producing polymeric films for use as fuel cells Process for producing polymeric films for use as fuel cells

C - Chemistry, Metallurgy

08

J

C08J 5/22 (2006.01) H01M 2/16 (2006.01) H01M 8/02 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2266101

A method for producing polymeric, e.g., polybenzimidazole (PBI) films, is provided by forming a porous membrane by coagulating a polymeric dope solution in a liquid coagulation bath containing a non-solvent alone or a mixture of a non-solvent and solvent; submerging the resulting membrane into a non-solvent bath to remove any residual solvent; placing the membrane into an acid solution, whereby the pores become filled with the acid solution; and drying the membrane to remove residual non-solvent which collapses the porous structure entrapping the acid and forming a dense film. An alternative method involves coagulating said polymer solution directly into an acid/solvent/non- solvent mixture to produce a porous membrane which imbibes the acid solution, followed by drying.

Procédé de fabrication de pellicules en polymère (par exemple, polybenzimidazole), qui consiste à former une membrane poreuse en coagulant une solution à dopage de polymère dans un bain de coagulation liquide renfermant un élément non solvant seul ou bien un mélange de non solvant et de solvant; à plonger la membrane résultante dans un bain non solvant, afin d'éliminer tout solvant résiduel; à placer la membrane dans une solution acide, les pores se remplissant alors de la solution acide; et à sécher la membrane pour éliminer le résidu de non solvant, ce qui entraîne l'effondrement de la structure poreuse et l'emprisonnement de l'acide, avec formation d'une pellicule dense. Selon une variante, on coagule directement la solution polymère en un mélange acide/solvant/non-solvant, de manière à obtenir une membrane poreuse qui s'imbibe de la solution acide et qui est ensuite séchée.

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