Polymer composition, membrane containing said composition, method for the production and uses thereof
AssigneeCelanese Ventures GmbH
InventorsThomas Soczka-Guth, Georg Frank, Jochen Baurmeister, Jürgen Pawlik, Rüdiger Knauf
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Abstract
Polymer composition, membrane comprising the same, process for production thereof and use thereof The composition described comprises 30 to 99.5% by weight of a sulfonated aromatic polyether ketone which has an ion-exchange capacity of from 1.3 to 4.0 meq (—SO3H)/g of polymer, and from 0.5 to 70% by weight of a polybenzimidazole. This composition can, as can a sulfonated polyether ketone of PEK type, be processed to give membranes, preferably used in fuel cells.
Claims25
A membrane comprising from 30 to 99.5% by weight of a sulfonated aromatic polyether ketone which has an ion-exchange capacity of from 1.3 to 4.0 meq (—SO3H)/g of polymer, and from 0.5 to 70% by weight of a polybenzimidazole, obtainable by a process comprising the following steps:
- a) preparing a solution comprising from 30 to 99.5% by weight of a sulfonated polyether ketone and from 0.5 to 70% by weight of a polybenzimidazole by dissolving the salt of the sulfonated polyether ketone and the polybenzimidazole in an organic solvent,
- b) using the solution obtained in step a) to produce a membrane having a thickness of at least 5 μm,
- c) washing the membrane obtained in step b) with water or with a dilute acid of from 0.1 to 20% strength.
A process for preparing a membrane which comprises the following steps:
- a) preparing a solution comprising from 30 to 99.5% by weight of a sulfonated polyether ketone and from 0.5 to 70% by weight of a polybenzimidazole by dissolving the salt of the sulfonated polyether ketone and the polybenzimidazole in an organic solvent,
- b) using the solution obtained in step a) to produce a membrane having a thickness of at least 5 μm,
- c) washing the membrane obtained in step b) with water or with a dilute acid of from 0.1 to 20% strength.
Dependencies are inferred from the claim text.