Synthesis Of A New Asymmetrical Ether Diamine With Aromatic Structure And Related Polyimide

A new aromatic asymmetrical ether diamine, 1,4-bis(3 ',4 ''-diaminophenoxy)benzene 3 was synthesized in three steps, using hydroquinone as starting material. A new aromatic polyimide containing asymmetrical diaryl ether segments was prepared from the resulting diamine with 4,4 '-oxydiphthalic anhydride (ODPA) via a conventional two-step thermal or chemical imidization method. The resulting polyimide exhibits high thermal resistance, excellent solubility, film-forming capability, high mechanical strength and modulus.