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Some characteristics of the formation of poly-1,3,4-oxadiazole macromolecules during single stage polycyclization in polyphosphoric acid

Authors
Journal
Polymer Science U S S R
0032-3950
Publisher
Elsevier
Publication Date
Volume
21
Issue
1
Identifiers
DOI: 10.1016/0032-3950(79)90320-4

Abstract

Abstract The possiblity is shown of degrading exchange reactions taking place amongst the 1,3,4-oxadiazole rings of the polymer chain and the reactive groups of the original monomers when the single stage polycyclization is carried out in polyphosphoric acid (PAA). The poly-1,3,4-oxadiazole (PODA) synthesized in these conditions have been established to have a wider MWD than the most probable, and the reason is the non-homogeneity of the reaction mass as regards the molecular weight of the polymer; this is due to the specifics of the polycyclization in PPA.

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