POLYMER MEMBRANES FOR FUEL ELEMENTS, BASED ON MIXTURES OF NITROGEN-CONTAINING POLYMERS AND NAPHION OR THEREOF ANALOGUES Russian patent published in 2016 - IPC C08J5/22 C08L79/00 B01D71/58 H01M8/10 H01M2/14 

FIELD: chemistry.

SUBSTANCE: invention relates to polymer membranes for low- or high-temperature polymer fuel elements. Proton-conducting polymer membrane, based on polyelectrolyte complex, consisting of: a) nitrogen-containing polymer, such as poly-(4-vinylpyridine) and its derivatives, obtained by alkylation, poly-(2-vinylpyridine) and its derivatives, obtained by alkylation, polyethylene imine, poly-(2-dimethylamino)ethylmethacrylate)methyl chloride, poly-(2-dimethylamino)ethylmethacrylate)methyl bromide, poly-(diallyldimethylammonium) chloride, poly-(diallyldimethylammonium) bromide, b) Nafion or other naphion-like polymer, selected from the group, including Flemion, Aciplex, Dowmembrane, Neosepta andion-exchange resins, containing carboxyl and sulphonic groups; c) liquid mixture, containing solvent, selected from the group, which includes methanol, ethyl alcohol, n-propyl, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, tert-butyl alcohol, formamides, acetamides, dimethylsulphoxide, N-methylpyrrolidone, as well as distilled water and their mixtures; in which molar ratio of nitrogen-containing polymer to Nafion or nafion-like polymer is within 10-0.001. Membrane materials based on such mixtures can be obtained by pouring said mixtures on flat surface at temperature and pressure, sufficient for evaporation of respective solvent.

EFFECT: proton conductivity of manufactured membranes based said mixtures exceeds proton conductivity of Nafion and its analogues, membranes also possess improved wear resistance, do not have any decrease of conductivity at 90°C, which provides high working temperatures and better stability in comparison with Nafion or its analogues.

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