Novel Polyamides Containing Biphenyl-phthalazinone Moieties

A novel diamine monomer 2H-(4-aminophenyl)-4-[4-(4-aminophenoxy) biphenyl]-phthalazinone 1 containing aza hetero cycle was synthesized and utilized for preparation of new high molecular weight aromatic polyamides with various aromatic dicarboxylic acids with the inherent viscosity of 0.50~1.62 g/dL. These polyamides had rather high glass transition temperatures of 327~356℃ and their structure was confirmed by IR, ¹H NMR and MS. They are readily soluble in polar solvents such as NMP, DMF etc. and easily cast into tough, flexible films.