4,4' -diaminodiphenyl ether (ODA), as the cornerstone of high-performance chemical materials, has its applications all over the high-tech frontier. In the aerospace sector, ODA synthetic polyimide resins provide lightweight, high-strength structural materials for aircraft. In the electronics industry, as an epoxy resin curing agent, it enhances the thermal stability and reliability of the circuit board, and supports the leap of 5G communication and semiconductor technology. In addition, ODA also plays an important role in the manufacture of wind power blades, improving the weather resistance and mechanical properties of the blades, and contributing to the development of green energy. In the medical sector, it is involved in high-performance polymers used in the manufacture of advanced medical devices to improve diagnosis and treatment. To sum up, 4,4'-Oxydianiline (ODA), with its unique properties, is constantly expanding the frontiers of science and technology and shaping a smarter, greener and healthier future world.