Used as a key monomer in the synthesis of high-performance polymers, particularly in the production of sulfonated poly(arylene ether sulfone)s and polyamides. These polymers exhibit excellent thermal stability, mechanical strength, and solubility, making them suitable for applications in fuel cell membranes, water purification membranes, and gas separation processes. Its sulfonic acid groups can be functionalized to enhance proton conductivity in proton-exchange membrane fuel cells (PEMFCs). Also employed in the development of ionomers and specialty resins for coatings and adhesives where chemical resistance and durability are required.