Sulphonic fluorinated ionomers crosslinked by radical crosslinking of:

  • A) crosslinkable sulphonic fluorinated ionomers, having equivalent weight 380-1300 g/eq and comprising: from 48% to 85% by moles of monomeric units deriving from tetrafluoroethylene (TFE);
  • from 15% to 47% by moles of fluorinated monomeric units containing sulphonyl groups —SO2F; from 0.01% to 5% by moles of monomeric units deriving from a bis-olefin of formula: ##STR1##

    wherein: m=2-10, preferably 4-8; R1, R2, R5, R6, equal to or different from each other, are H or C1-C5 alkyl groups;

  • B) a fluorinated compound as crosslinking radical initiator;
  • C) a fluorinated bis-olefin of structure (I) as crosslinking agent;
  • the radical crosslinking being carried out at a temperature in the range 250 C.-310 C., preferably 260 C.-300 C.
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