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

✍ Scribed by P.G. Gervasi; S. de Petris; D. Lupinacci

Publisher
Elsevier Science
Year
1975
Tongue
English
Weight
416 KB
Volume
11
Category
Article
ISSN
0014-3057

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✦ Synopsis

Some aromatic poly(amid-hydrazidesl have been synthesized b) solution polycondensation at low temperature of aromatic hydrazides x~ith aroyl dichlorides. By heating these polymers at temperatures near 300, dehydrocyclizalion occurs to give polymers containing the oxadiazole ring in the main chain. Their excellent thermal stabilit3 has been tested by thermogravimetric analysis. Some physical properties of these aromatic heterocyclic po13 mers have been reported. * Inherent viscosity in 0-5~ conc H2SO, solution at 25 =. t" Decomposition temperature as determined by TG. Ta is assumed as the interception produced by extrapolation of both sections before and after the "'knee" in the TG curves, indicating a sudden increase in rate of decomposition.

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