4′-diaminodiphenyl ether (ODA) is one of the important monomers for polyimide. Domestic production capacity is continuing to increase.

4,4′-diaminodiphenyl ether, also known as bis(4-aminophenyl) ether, referred to as ODA, is an organic compound with the chemical formula C12H12N2O. It appears as a colorless crystalline powder, is toxic, and is insoluble in water. , slightly soluble in ethanol, soluble in dilute salt. 4,4′-diaminodiphenyl ether is an important chemical raw material, dye, and pharmaceutical intermediate.…