Polyfluorene-based ionomer, anion exchange membrane, method for preparing the polyfluorene-based ionomer and method for fabricating the anion exchange membrane

A method for preparing a polyfluorene-based ionomer, comprising:

• (I) dissolving fluorene or 9,9′-dimethylfluorene and 1-methyl-4-piperidone or fluorene or 9,9′-dimethylfluorene, 1-methyl-4-piperidone, and a compound selected from
• or 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-pentanone as a comonomer in an organic solvent to form a solution;
• (II) adding a strong acid catalyst to the solution and allowing the solution to react with stirring;
• (III) precipitating the solution to obtain a precipitate and washing and drying the precipitate to obtain a solid polymer;
• (IV) dissolving the solid polymer in an organic solvent to form a polymer solution, adding K2CO3 and an excess of a halomethane to the polymer solution, and allowing the polymer solution to react to form quaternary piperidinium salts;
• and (V) precipitating the polymer solution to obtain a precipitate and washing and drying the precipitate.