Abstraet--Polyhydrazides with parabanic structures were prepared by polycondensation between a new monomer containing a preformed parabanic ring, viz. 1,3 p(bis-chloroformylphenyl) parabanic acid and dihydrazides. By thermal cyclization with polyphosphoric acid, the polyhydrazides were converted to
Thermal behavior of polyhydrazides and poly-1,3,4-oxadiazoles
β Scribed by Frazer, A. H. ;Sarasohn, I. M.
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1966
- Tongue
- English
- Weight
- 751 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0449-296X
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π SIMILAR VOLUMES
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. T
## Abstract High molecular weight polyβ__N__βalkylhydrazideβoxadiazoles have been prepared in polyβphosphoric acid by alkylation of polyβ1,3,4βoxadiazole which was synthesized from terephthalic acid and hydrazine sulfate. Various kinds of reagents having an alkoxy group were used as alkylating agen