Synthesis and thermal properties of linear aromatic poly(amidehydrazides) and corresponding poly(amide-1,3,4-oxadiazoles) and poly(1,3,4-oxadiazolyl-benzoxazoles)

Some aromatic poly(amid-hydrazides) have been synthesized by solution polycondensation at low temperature of aromatic hydrazides with aroyl dichlorides. By heating these polymers at temperatures near 300, dehydrocyclization occurs to give polymers containing the oxadiazole ring in the main chain. Their excellent thermal stability has been tested by thermogravimetric analysis. Some physical properties of these aromatic heterocyclic polymers have been reported.