Electrolyte membrane for high-temperature polymer electrolyte membrane fuel cell

A method of manufacturing an electrolyte membrane for a high-temperature polymer electrolyte membrane fuel cell, comprising:

• preparing an intermediate material represented by Chemical Formula 3 below by condensation polymerization of a fluorene monomer and a diphenyl ether monomer in presence of an acid catalyst;
• preparing a polymer electrolyte represented by Chemical Formula 4 below by reacting the intermediate material with an amine compound;
• manufacturing a thin film using the polymer electrolyte;
• and
• manufacturing an electrolyte membrane by impregnating the thin film with phosphoric acid:
• in Chemical Formula 3, n3 is a number ranging from 10 to 90;
• and
• in Chemical Formula 4, n4 is a number ranging from 10 to 90.