Electron spin resonance in pyrolyzed lignin
- 1 June 1969
- journal article
- research article
- Published by Taylor & Francis in Journal of Macromolecular Science, Part B
- Vol. 3 (2), 271-292
- https://doi.org/10.1080/00222346908205094
Abstract
An investigation has been made into electron spin resonance (ESR) occurring in the ranges of carbons prepared from periodate lignin by vacuum pyrolysis. Line shape, line width, g-factors, saturation effects, and free spin concentration have been measured and the effect of oxygen on these parameters has been examined. A g-shift and lines with inhomogeneous broadening have been observed. In the presence of oxygen the lower-temperature carbons showed an unexpected increase in the detectable free spin concentration. The discussion includes factors affecting the nature of the free spins in the pyrolyzed material.Keywords
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