The N--N linkage in hydrazine is thermally stable when it is tetrasubstituted and there are electron-withdrawinggroups attached to the nitrogen atoms. Our research on the synthesis of polymers contaning N--N linkages is reviewed. The N

N-bisimide structure has been introduced in the backbone of polymers as well as a pendant group in poly(aryl ether)s togive very thermoxidatively stable polymers with very high glass transition temperatures. Most of the polymers form tough

flexible films. N-Aminotriazoles also form stable imides by reaction with anhydrides and these N-imidotriazole groups have been introduced as pendent groups on poly(aryl ether)s.The polymers are highly fluorescent materials.Three methods for the synthesis of polymers containing the tetrasubstituted-azine structure will be discussed:(1) oxidative coupling of bisimines;(2) condensation of bishydrazones with diketones;(3)poly(aryl ether azines)from the azine formed from 4-fluororbenzo-phenone by reaction with salts of bisphenols.