Electron spin resonance in pyrolyzed lignin |
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| Authors: | A J Nanassy A Vyas |
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| Institution: | 1. Forest Products Laboratory Department of Forestry and Rural Development Ottawa , Ontario, Canada;2. Physics Department , Lucknow University , Lucknow, India |
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| 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. |
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| Keywords: | Rheological properties Phase separation Spinodal decomposition |
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