NOVELTY - A proton conducting polymer has a sulfonic acid group attached to a chain of poly(fluorinated aromatic ether) polymers prepared by a nucleophilic substitution of an aryl halide and a diphenol derivative.    USE - For a proton conducting polymer membrane used in an automobile fuel cell (claimed).    ADVANTAGE - The invention does not cause water flooding, has good high-temperature properties, can be prepared at a low cost due to easy sulfonation and prevents a catalyst from poisoning. The proton conducting polymer membrane can be more easily manufactured and can be commercialized as an automobile fuel cell due to its low cost of production. It has high moisture content and does not cause water flooding at high current density, thus improving the efficiency of a cell. It also enables a fuel cell to stably operate at greater than or equal to100degreesC, thus preventing poisoning of a catalyst and extending the lifetime of the fuel cell.    DETAILED DESCRIPTION - A proton conducting polymer has a repeating unit of structure (I).    R1, R2=Me or trifluoromethyl;    n=100-100000.    INDEPENDENT CLAIMS are also included for:    (A) a method of manufacturing a proton conducting polymer membrane (11), comprising:    (i) dissolving decafluorobiphenyl and diphenol derivative in an organic solvent, adding potassium carbonate to the solution, and stirring and heating the solution;    (ii) cooling the solution and pouring the solution into an aqueous acetic acid solution to precipitate a polymer;    (iii) dissolving the polymer in an aprotic organic solvent and adding a strong acid group donor into the solution to sulfonate; and    (iv) adding 1-10 wt.% silicon dioxide solution to a solution of the polymer dissolved in acetone, uniformly dispersing and evaporating the solvent to form a membrane;    (B) a proton conducting polymer membrane; and    (C) a fuel cell manufactured using the proton conducting polymer membrane.    DESCRIPTION OF DRAWING(S) - The figure shows a structure of a general proton exchange membrane fuel cell.    Proton conducting polymer membrane (11)    Catalyst layers (12, 13)    Anode and cathode backing layers (14, 15)