TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The electrolyte membrane further comprises: at least one inorganic substance comprising silicon dioxide, titanium dioxide, inorganic phosphate, sulfonated silicon dioxide, sulfonated zirconium oxide or sulfonated zirconium phosphate; and porous carrier particles comprising silicon dioxide, aluminum oxide, zirconium oxide or zeolite.    TECHNOLOGY FOCUS - POLYMERS - Preparation (Disclosed): The preparation of (I), comprises carrying out condensation polymerization of naphthalene derivatives of formula (III), diol compounds of formula (HO-E-OH) (IV) and hydrocarbon compounds of formula (Z-D1-X) (V) to obtain proton-conducting polymer of formula (Ia).Y11 = -OH or -SH;A11 = phenyl or naphthyl;X = halo; andp = 1-m.Preferred Components: (I) is a random- or a block copolymer. (I) exhibit a weight average molecular weight of 5000-1000000. The electrolyte membrane further comprises at least one polymer comprising polyimide, polyether ketone, polysulfone, polyethersulfone, polyether ether sulfone, polybenzimidazole, polyphenylene oxide, polyphenylene sulfide, polystyrene, polytrifluorostyrene-sulfonic acid, polystyrene-sulfonic acid, polyvinylidene fluoride, polyurethane or a branched sulfonated polysulfone-ketone copolymer. Preferred Definitions:    D1 = benzene-diyl, biphenyl-diyl, (1-methyl-1-phenylethyl)benzene-diyl, (1,1-diphenylethyl)benzene-diyl, naphthalene-diyl, anthracene-diyl, (1,1';3',1'')terphenyl-diyl, perylene-diyl, phenanthrene-diyl, diphenylmethane-diyl, 5,5'-(propane-2,2-diyl)bis(1,3-dimethylbenzene)-diyl, bis(3,5-dimethylphenyl)methane-diyl, (1,1';3',1'';3'',1''')quaterphenyl-diyl, 5,5'-sulfonylbis(1,3-dimethylbenzene)-diyl, sulfonyldibenzene-diyl, diphenyl-methanone-diyl, 3,3'-(propane-2,2-diyl)dibiphenyl-diyl or (perfluoropropane-2,2-diyl)dibenzene-diyl; and    E = diphenyl-methanone-diyl, benzonitrile-diyl, sulfonyldibenzene-diyl, 5,5'-sulfonylbis(1,3-dimethylbenzene)-diyl, 1,2,4,5-tetrafluoro-benzene-diyl or 2,3,5,6,2',3',5',6'-octafluorobiphenyl.    EXAMPLE - (E)-4,4'-(1,2-Diphenylethene-1,2-diyl)dinaphthalen-1-ol (2 equivalent parts by wt.), bis(4-hydroxyphenyl)sulfone (8 equivalent parts by wt.), bis(4-fluorophenyl)sulfone (10 equivalent parts by wt.) and potassium carbonate (12 equivalent parts by wt.) were dissolved in N-methylpyrrolidone. Then toluene was added to the obtained solution. Then the obtained solution was heated to 160?o C. Then the reaction mixture was worked up to obtain proton-conducting polymer.