Used primarily as a monomer in the synthesis of high-performance polymers, especially polyether sulfones and polyimides. Its structure contributes thermal stability, mechanical strength, and resistance to hydrolysis, making it valuable in engineering plastics for aerospace, electronics, and medical devices. Commonly found in membranes for fuel cells and filtration systems due to its chemical resistance and ability to form rigid, durable matrices. Also employed in liquid crystal materials for display technologies owing to its biphenyl rigidity and electronic properties.