A series of new poly(1,3,4-oxadiazole-imide)s has been synthesized fro
m various aromatic dihydrazides and diacid chlorides which contain bot
h imide and hexafluoroisopropylene units. The diacid chlorides were re
acted with aromatic dihydrazides to prepare poly(hydrazide-imide)s whi
ch were subsequently cyclodehydrated in their solid state to give poly
(1,3,4-oxadiazole-imide)s. The new polymers were soluble in polar solv
ents and were stable up to 450-480 degrees C in nitrogen, as determine
d by thermogravimetric analysis.