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Proceedings Paper

Elucidation Of The High Temperature Oxidation Mechanism Of A Polybenzimidazole Through FT-IR Studies Of Isotopically Labeled Materials.
Author(s): J. J. Rafalko; E. Chenevey
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Paper Abstract

FT-IR studies of the oxidation of carbon-13 labeled [poly-2,2' (m-phenylene)-5,5' bibenzimidazole], PBI, and of the reactions of PBI in oxygen-18 environments were conducted to evaluate a previously proposed mechanism (1,2). A tentative oxidative degradation mechanism had been proposed primarily on the basis of mass spectral analyses of gaseous decomposition products, comparisons with model solution oxidation studies (1), and limited infrared analysis (2). It was postulated that initial attack on PBI occurs at the imidazole N-H. Abstraction of the N-H hydrogen by oxygen produces radicals. Oxygen reacts with these species to form quinoid type structures in the rings attached to the imidazole. These intermediates then break down into acids and eventually into aromatic nitriles and gaseous products. Again, only the nitriles and gaseous products were observed in the polymer studies.

Paper Details

Date Published: 1 December 1989
PDF: 1 pages
Proc. SPIE 1145, 7th Intl Conf on Fourier Transform Spectroscopy, (1 December 1989); doi: 10.1117/12.969446
Show Author Affiliations
J. J. Rafalko, Hoechst Celanese (United States)
E. Chenevey, Hoechst Celanese (United States)

Published in SPIE Proceedings Vol. 1145:
7th Intl Conf on Fourier Transform Spectroscopy
David G. Cameron, Editor(s)

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