Elucidation Of The High Temperature Oxidation Mechanism Of A Polybenzimidazole Through FT-IR Studies Of Isotopically Labeled Materials.

J. J. Rafalko; E. Chenevey

doi:10.1117/12.969446

1 December 1989 Elucidation Of The High Temperature Oxidation Mechanism Of A Polybenzimidazole Through FT-IR Studies Of Isotopically Labeled Materials.

J. J. Rafalko, E. Chenevey

Author Affiliations +

Proceedings Volume 1145, 7th Intl Conf on Fourier Transform Spectroscopy; (1989) https://doi.org/10.1117/12.969446
Event: Seventh International Conference on Fourier and Computerized Infrared Spectroscopy, 1989, Fairfax, VA, United States

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.

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J. J. Rafalko and E. Chenevey "Elucidation Of The High Temperature Oxidation Mechanism Of A Polybenzimidazole Through FT-IR Studies Of Isotopically Labeled Materials.", Proc. SPIE 1145, 7th Intl Conf on Fourier Transform Spectroscopy, (1 December 1989); https://doi.org/10.1117/12.969446

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