FIELD: chemistry.
SUBSTANCE: invention relates to methods of producing perfluorinated polymers with sulfo-groups and is used in production of proton conducting ion-exchange membranes. The method involves copolymerisation of tetrafluoroethylene with perfluoro(3,6-dioxa-4-methyl-7-octene)sulfonylfluoride in the medium of an organic solvent - perfluoromethyl diethylamine at temperature 50°C and pressure 2.5-5 atm. The initiator used is bis(perfluorocyclohexanoyl)peroxide.
EFFECT: invention solves the problem of increasing molecular weight of a copolymer of tetrafluoroethylene with perfluoro(3,6-dioxa-4-methyl-7-octene)-sulfonyl fluoride and replacing the ozone-depleting solvent with an environmentally safe solvent.
2 dwg, 1 tbl, 13 ex
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