Bromosulphonated fluorinated cross-linkabke elastomers based on vinylidene fluoride having low t9 and processes for their preparation

摘要

Compounds corresponding to formula (I)F2C=CFX(CY2)nBr (I)in which: X represents an atom of oxygen or no atom; Y represents an atom of hydrogen or of fluorine; and n is a whole natural number ranging from 0 to 10 inclusive, excluding bromotrifluoroethylene, 3-bromo-perfluoropropene, 4-bromo-1,1,2,-trifluorobutene, 4-bromo-perfluorobutene-1 and perfluoro(2-bromo-ethylvinyl ester), and their use in the synthesis of fluorinated copolymers then in the synthesis of homosulphonated fluorinated elastomers, exhibiting a low glass transition temperature.