FIELD: chemistry.
SUBSTANCE: membrane is made of a tetrafluoroethylene copolymer with functional perfluorinated comonomers of the general structural formula: 
where R: 
(D), 
(E), 
(K), M-H, Li, K, Na; a=24.75-18.38 mol.%; b=78.62-81.12 mol.%; c=5.0-0.5 mol.%; and is from 10 mcm and higher thick, density is 1.93-2.10 g/cm3, mechanical strength is 16-22 MPa and a coefficient of gas permeability by hydrogen (K) is 1-3.7×10-16 m3m m-2Pa-1s-1 at 20-90°C. A method of obtaining consists in combination of a porous polytetrafluoroethylene film with a perfluorosulphocationite polymer in a medium of an organic or a water-organic solvent in the presence of a modifier. The modifier is represented by hydrocarbon polymers, fluoropolymers, perfluoropolymers or their mixtures, inorganic compounds or their mixtures.
EFFECT: high drops of pressure, high current density and efficiency of an electrolysis cell exploitation.
13 cl, 3 tbl, 28 ex
