| 摘要 |
Sulphonic fluorinated ionomers crosslinked by radical crosslinking of: A) crosslinkable sulphonic fluorinated ionomers, having equi- valent 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 con- taining sulphonyl groups -SO2F; from 0.01% to 5% by moles of monomeric units deriving from a bis-olefin of formula: 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.degree.C-310.degree.C, preferaably 260.degree.C-300.degree.C.< /SDOAB> |
