TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The perfluorinated superacid is present in the composition at 0.1-2.84 meq/g of membrane composition; or the superacid is present at about 0.1-2.84 meq/g of polymer. Preferred Components: The hydrocarbon polymeric main chain comprises at least one of polyolefins, polystyrene, polyisoprene, polybutadiene, polyvinylchloride, polyvinylfluoride, polyvinylidene fluoride, polyacrylates, polymethacrylates, polychloroprene, polyacrylonitrile, or its copolymers. The superacid comprises -Rf-SOnX; and the reactive compound comprises Z-Rf-SOnX.Rf=a perfluorinated radical;n=2 or 3;X=an element selected from hydrogen, fluorine, chlorine, sodium, potassium, lithium, magnesium, and its combination; andZ=a reactive radical capable of reacting and chemically attaching to the hydrocarbon polymer.The perfluorinated radical comprises a perfluorinated olefin, a perfluoroether, or its combination. The electrochemical cell membrane composition further comprises a product of a chemical reaction between the hydrocarbon polymer and the reactive compound having the perfluorinated superacid group. The hydrocarbon polymer comprises at least one of polyolefins, polystyrene, polyisoprene, polybutadiene, polyvinylchloride, polyvinylfluoride, polyvinylidene fluoride, polyacrylates, polymethacrylates, polychloroprene, polyacrylonitrile, or its copolymers. Preferred Method: The chemical reaction is a coupling reaction or a graft polymerization reaction, where the coupling reaction is an addition, displacement, radical coupling or condensation reaction. The graft polymerization reaction is a free radical initiated polymerization. Preferred Conditions: The operating temperature of the fuel cell is at least 120 degrees C and the hydration level of the membrane is more than 0.6 millimole of super-acid groups per gram of membrane. Preferred Definitions:    Z=a halogen, a fluorinated vinyl group, or an iodine radical;    X=hydrogen, fluorine or chlorine, preferably fluorine; and    n=2.    EXAMPLE - No suitable example given.