TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The alkali metal hydroxide is potassium hydroxide. The solvent is water.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The solvent is also selected from an organic solvent or a mixture of water and an organic solvent. Another solvent is additionally added to the mixture, where the latter solvent is an alcohol, water, liquid carbon dioxide, an aldehyde, a ketone, acetonitrile, dimethylsulfoxide, a sulfone, a thiophene, acetate, an amide or their mixture. A dihydroxy compound is also added to the mixture, where the dihydroxy compound is bisphenol A. The electrolyte membrane is also formed by forming a mixture including dihydroxy compound, an alkali metal hydroxide, and a triphenyl compound of general formula (XII). A sulfonic acid derivative of general formula (XIII) is also added to the mixture. Another mixture is disposed on a porous substrate, which forms a proton conductor on the porous substrate.R16-R18=hydrogen atom, halogen atom, 1-10C alkyl group, halogen-substituted 1-10C alkyl group, 6-10C aryl group, or a halogen-substituted 6-10C aryl group;n,o and p=integers from 1-4; andR19 and R20=hydrogen atom, halogen atom, 1-10C alkyl group, halogen-substituted 1-10C alkyl group, 6-10C aryl group, or a halogen-substituted 6-10C aryl group.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polyhydroxy compound has general formulae (I-II).B'=hydrogen, alkyl, aryl or a protonic acid containing group, where the protonic acid group is a sulfonate group (-SO3H), a carboxylate group (-COOH), a phosphate group (-PO3H2), an alkylsulfonate group -((R4)nSO3H), a sulfamoylsulfonylalkyl group or a sulfamoylsulfonylaryl group (-SO2NHSO2R);R=alkyl or aryl, a perfloruoalkylsulfonate group ((CF2)nSO3H), a sulfonylalkylsulfonate group (SO2(R4)nSO3H), a sulfonylperfluoroalkylsulfonate group (SO2(CF2)SO3H), a sulfamoylsulfonylalkylsulfonate group (SO2NHSO2(R4)nSO3H), a sulfamoylsulfonylperfluoroalkylsulfonate group (SO2NHSO2(CF2)nSO3H), an alkylcarboxylate group (-(R4)nCOOH), a perfluoroalkylcarboxylate group (CF2)nCO2H, an alkylphosphonate group (-(R4)nPO3H2), a perfluoroalkylphoshonate group or their conjugated salts having a metal cation;R1 and R2=hydrogen atom, halogen atom, 1-10C alkyl group, halogen-substituted 1-10C alkyl group or 6-50C aryl group;q and r=integers from 1-4;R3=hydrogen atom, halogen atom, 1-10C alkyl group, halogen-substituted 1-10C alkyl group, 6-50C aryl group, or a halogen-substituted 6-50C aryl group;R4=an alkyl, aryl or perfluoroalkyl group;X=O, S, or SO2;W'=groups of general formulae (III-IX), -SO2NHSO2- or -SO2(CF2)nSO2-;R''' and R''''=hydrogen atom or a monovalent linear or cyclic hydrocarbon group;R'''''=divalent hydrocarbon group, oxygen or sulfur;R5, R6 R7 and R8=hydrogen atom, halogen atom, 1-10C alkyl group, halogen-substituted 1-10C alkyl group, 6-50C aryl group or a halogen-substituted 6-50C aryl group; andn, o and p=integers from 1-4.The aromatic polyhalide compound has general formulae (X-XI).X=halogen;R9 and R10=hydrogen atom, halogen atom, 1-10C alkyl group, halogen-substituted 1-10C alkyl group, 6-10C aryl group, or a halogen-substituted 6-10C aryl group;s and t=integers from 1-4;R11=groups of general formulae (III-IX), -SO2NHSO2- or -SO2(CF2)nSO2-;C'=a protonic acid containing group, which is an alkylsulfonate group (-(R12)nSO3H);R12=an alkyl, aryl or perfluoroalkyl group;R13 and R14=hydrogen atom, halogen atom, 1-10C alkyl group, halogen-substituted 1-10C alkyl group, 6-10C aryl group or a halogen-substituted 6-10C aryl group;q and r=integers from 1-3;R15=groups of general formulae (III-IX), -SO2NHSO2- or -SO2(CF2)nSO2-; andM=a metal cation from 1st group of the periodic table of elements.The porous substrate is a polyolefin, a polyamide, a polycarbonate, a cellulosic polymer, a polyurethane, a polyester, a polyether, a polyacrylate, a copolyether ester, a copolyether amide, a fluoropolymer or their mixture, where the porous substrate comprises a fluoropolymer selected from polytetrafluoroethylene, a poly(vinylidene fluoride), a poly(vinylidene fluoride co-hexafluoropropylene), a poly(tetrafluoroethylene oxide-co-difluoromethylene oxide), a poly(tetrafluoroethylene-co-perfluoro(propylvinyl ether)) or their mixture. The fluoropolymer is expanded polytetrafluoroethylene. The crosslinked proton conductor is obtained by sulfonating and crosslinking a proton conductor, where the proton conductor is selected from a polyetherketone, a polyphenylene ether, a polybenzimidazole, a polyethersulfone, a polysulfone, a polybenzoxazole, a polybenzothiazole, a polythiazole, a polyphenylquinoxaline, a polypyridine, a polypyrimidine, a polyoxathiazole, a polytetrazapyzarene, a polyvinylpyridine, a polyvinylimidazole, a polypyrrolidone, a sulfonated derivative of a polyetherketone, a polyphenylene ether, a polybenzimidazole, a polyethersulfone, a polysulfone, a polybenzoxazole, a polybenzothiazole, a polythiazole, a polyphenylquinoxaline, a polypyridine, a polypyrimidine, a polyoxathiazole, a polytetrazapyzarene, a polyvinylpyridine, a polyvinylimidazole, a polypyrrolidone or their mixture. EXAMPLE - The example illustrates the manufacturing of electrolyte membrane. Tris(phydroxyphenyl)ethane (0.23 g, 0.73 mmol) was added in a flask equipped with a dean-stark condenser. Potassium hydroxide (0.122 g, 2.18 mmol), dimethylformamide (7.7 ml) and toluene (2.3 ml) were added in the flask. The mixture was heated at 150 degrees C under nitrogen atmosphere for four hours to promote the deprotonation reaction. After cooling the solution to room temperature, sulfonated difluorodihalophenylsulfone (0.5 g, 1.09 mmol) was added to the solution. The solution was heated overnight at 60 degrees C to dissolve the 3,3'-disulfonated 4,4'-difluorodiphenyl sulfone (SDFDPS). The solution with the SDFDPS was cast on an expanded polytetrafluoroethylene film and heated in an oven at 140 degrees C in nitrogen atmosphere overnight to promote the cross-linking reaction. A light brown film was obtained.