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US 2001/0020082 A1Published application
Sulphonated polyimides, membranes prepared with them, and a fuel cell device that includes these membranes
AssigneesCommissriat a l'Energie Atomique, Centr National de la Recherche Scientifique
InventorsSylvain Faure, Michel Pineri, Pierre Aldebert, Regis Mercier, Bernard Sillion
Life of this patent
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Abstract
The invention relates to sulphonated polyimides, notably of formula (I) 1 The invention also relates to an ion exchange membrane that includes such a polyimide and a fuel cell that includes such a membrane. The membranes of the invention have excellent durability and low cost and the fuel cells can be used, in particular, in electric vehicles.
Claims17
A sulphonated polymer characterised in that it comprises repeating structures of formula (In) 20
- and repeating structures of formula (Im) 21
- in which
- the groups C1 and C2 can be identical or different and each represent a tetravalent group that includes at least aromatic carbon ring possibly substituted and having from 6 to 10 atoms of carbon and/or a heterocyclic ring with aromatic character, possibly substituted and having from 5 to 10 atoms and including one or more heteroatoms chosen from among S, N, and O;
- C1 and C2 each forming with the neighbouring imide groups rings with 5 or 6 atoms.
- the Ar1 and Ar2 groups can be identical or different and each represent a divalent group that includes at least one aromatic carbon ring possibly substituted and having from 6 to 10 atoms of carbon and/or a heterocyclic ring with aromatic character, possibly substituted and having from 5 to 10 atoms and including one or more heteroatoms chosen from among S, N and O;
- at least one of said aromatic carbon rings and/or heterocyclic rings of Ar2 being, in addition substituted by at least one sulphonic acid group.
3 more elements
Dependencies are inferred from the claim text.