FLUOROPOLYMERS AND MEMBRANES PREPARED FROM SUCH POLYMERS, IN PARTICULAR FOR FUEL CELLS AND METHOD FOR SYNTHESIZING SUCH POLYMERS

摘要

The invention concerns fluoropolymers comprising at least one repeat unit of formula (I), wherein: groups X and Y, identical or different, represent H or F; group Z represents F or a perfluorinated alkyl group; group W represents CH₂O or CF₂O or CO₂; group Ar represents a divalent group including at least one optionally substituted carbon-containing aromatic cycle; group Q represents a single bond, (CF₂)_n with 1 = n = 10, or - C₂F₄OC₂F₄; group G represents a cation exchanging group, preferably selected among SO₂R₁, with R₁ representing OH, F or Cl; or P(=O) (OR₂)₂ with R₂ representing H or an optionally substituted alkyl group, or CO₂H and having ion exchange capacity not less than 0.5 meq/g polymer. The invention also concerns the method for synthesizing said polymers, the membranes obtained from said polymers and fuel cell devices comprising such membranes.