TECHNOLOGY FOCUS - POLYMERS - Preparation (Claimed): Preparation of (I) comprises synthesizing 2,6-bis(4-hydroxyphenoxy)-4'-(2,3,4,5,6-pentaphenyl phenyl)benzophenone (sic), primary polymer, and sulfonating polymer, where the 2,6-bis(4-hydroxyphenoxy)-4'-(2,3,4,5,6-pentaphenyl phenyl)benzophenone (sic) is prepared by providing 2,6-difluoro benzoyl chloride as raw material, bromobenzene as solvent and anhydrous aluminum trichloride in reacting 2,6-difluoro benzoyl chloride with anhydrous aluminum trichloride and then mechanically stirring under ice water bath, dropping the raw material into a reaction system, stirring for 15-30 minutes and then removing from ice water bath, raising temperature to reflux of the bromobenzene and then reacting for 4-6 hours, adding 15% of aqueous hydrochloric acid into the reaction system at room temperature, extracting organic phase using chloroform, evaporating extract under reduced pressure to remove the bromobenzene to obtain a white solid, recrystallizing white solid using petroleum ether to obtain white crystals A, where white crystal A is 2,6'-difluoro diphenyl ketone, mixing white crystal A, cuprous iodide, triphenyl phosphine, bis(triphenylphosphine)palladium(II) dichloride and triethylamine with a weight ratio of 1:0.005-0.006:0.007-0.008:0.001-0.002, and then mechanical stirring under the protection of nitrogen, raising the temperature to 60-70 degrees C, and then adding drop wise adding 0.001 ml of phenylacetylene, raising temperature to 80-90 degrees C to react for 4-6 hours, filtering and then washing obtained product with water to obtain yellow needle crystal B, adding and mechanical mixing yellow needle crystal B, tetraphenylcyclopentadienone, sulfolane or diphenyl under the protection of nitrogen, raising the temperature to 260-280 degrees C for 6-8 hours, cooling the mixture to room temperature to obtain yellow solid, washing yellow solid with ethanol, re-crystallizing to obtain fluorine monomer C, where monomer C is 2,6-difluoro-4-(2,3,4,5,6-phenyl) benzophenone, and the weight ratio of the yellow needle crystal B and the tetraphenylcyclopentadienone 1:1-1.1, adding reaction products into a container, adding water into the reactant product for 1.5-4 times, adding solids content (20-40 wt.%) solvent (20-30 wt.%), toluene, xylene or azeotropic dehydrating agent and then mechanical stirring under the protection of nitrogen, raising the temperature and then reacting for 2-3 hours, removing the azeotropic dehydrating agent, raising the temperature to 200-210 degrees C and then continuously reacting for 6-7 hours, precipitating obtained solution in distilled water to obtain grey solid, washing grey solid using sodium hydroxide, recrystallizing to obtain white solid D, which is the tripolymer, where weight ratio of the sodium hydroxide and the tripolymer is 1:10, placing the washed product under the protection of nitrogen, raising the temperature and then reacting for 6-8 hours, cooling the reaction system to room temperature, adding obtained product into distilled water, filtering, re-crystallizing to obtain monomer E, which is 2,6-difluoro-4-(2, 3, 4,5, 6-phenyl) benzophenone (sic), synthesizing obtained product, adding anhydrous potassium carbonate as salt forming agent, sulfolane as solvent, toluene into a three-mouth flask and then mechanical stirring under the protection of argon gas protection, heating in oil bath to reflux obtained product for 3 hours to remove water content in the reaction at temperature 200-220 degrees C for 6 hours to obtain crude product, mass quantity of solid content in the crude product is 25%, azeotropic dehydrating agent is 20%, washing crude product with the water and then crushing, filtering, boiling using ethanol, the crude product, repeating for 5-6 times, drying in the oven to obtain initial polymer, which is a high density sulfonated ether polymer, adding sulfonated ether polymer to concentrated sulfuric acid (10-15 ml), stirring and reacting for 12 hours to obtain polymer solution and then adding into ice water, crushing, filtering, boiling by distilled water, filtering, until reaching neutral and drying in an oven to obtain sulfonated polyarylene polymer. Preferred Method: The application method comprises adding sulfonated polyarylene ether sulfone (8-10 ml) into N,N-dimethyl ether sulfone and N,N-dimethyl acetamide and then adding obtained product on a glass plate after filtration, where the temperature on the glass plate is 60 degrees C for 2 hours, 80 degrees C for 2 hours, 100 degrees C for 2 hours, and at 120 degrees C for 2 hours after vacuumizing for 12 hours to obtain a transparent membrane.