Crosslinked ion conductive membranes

Details Crosslinked ion conductive membranes Crosslinked ion conductive membranes

B - Operations, Transporting

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D

B01D 71/52 (2006.01) B01D 67/00 (2006.01) B01D 71/68 (2006.01) B01D 71/82 (2006.01) C08G 65/48 (2006.01) C08J 5/22 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2331720

A method is provided for making crosslinked acidic polymers useful as ion conductive membranes, such as crosslinked sulfonated polyether ketones, sulfonated polysulfones, sulfonated polystyrenes, and other acidic polymers, by crosslinking with a species which generates an acidic functionality. The crosslinker preferably binds to acid functions by conversion of acid groups to imide functinality, which, due to the acidity of the N-H bonds therein, compensate for the acidity lost by the occupation of the acid groups and thus preserve membrane conductivity while contributing to membrane strength and resistance to swelling.

L'invention concerne un procédé permettant de produire des polymères acides réticulés utiles comme membranes conductrices d'ions, tels que les cétones polyéther sulfonées réticulées, des polysulfones sulfonés, des polystyrènes sulfonés, et autres polymères acides, par réticulation avec des espèces qui génèrent une fonction acide. L'agent de réticulation, de préférence, se lie aux fonctions acides par conversion de groupes acides en fonctions imides qui, grâce à l'acidité des liens N-H contenus, compensent la perte d'acidité par l'occupation des groupes acides et ainsi préservent la conductivité de la membrane tout en contribuant à la solidité et à la résistance au gonflement de la membrane.

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