A series of new poly(1,3,4‐oxadiazole‐imide)s has been synthesized from various aromatic dihydrazides and diacid chlorides which contain both imide and hexafluoroisopropylene units. The diacid chlorides were reacted with aromatic dihydrazides to prepare poly(hydrazide‐imide)s which were subsequently cyclodehydrated in their solid state to give poly(1,3,4‐oxadiazole‐imide)s. The new polymers were soluble in polar solvents and were stable up to 450‐480°C in nitrogen, as determined by thermogravimetric analysis.
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Hamciuc et al. (1996) studied this question.
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