Mechanism of X-ray-induced degradation of pyromellitic dianhydride

Strunskus, T.; Hahn, C.; Grunze, M.

doi:10.1016/0368-2048(93)80051-M

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Mechanism of X-ray-induced degradation of pyromellitic dianhydride

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Grunze, M.
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Strunskus, T., Hahn, C., & Grunze, M. (1993). Mechanism of X-ray-induced degradation of pyromellitic dianhydride. Journal of Electron Spectroscopy and Related Phenomena, 61(2), 193-216. doi:10.1016/0368-2048(93)80051-M.

Cite as: https://hdl.handle.net/21.11116/0000-0001-9A75-E

Abstract

The degradation of pyromellitic dianhydride (PMDA) under X-ray exposure has been studied by a combination of X-ray photoelectron spectroscopy and Fourier transform IR reflection absorption spectroscopy. Vapor deposited PMDA films show significant degradation under prolonged X-ray exposure. The data indicate that the initial degradation reaction follows a unimolecular mechanism and includes cleavage of the anhydride rings with the release of CO2 molecules, which are either trapped in the film or released into the vacuum.