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Electron-nuclear double resonance (endor) of pitches

✍ Scribed by L.S. Singer; I.C. Lewis

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
547 KB
Volume
22
Category
Article
ISSN
0008-6223

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✦ Synopsis

preliminary study of Electron-Nuclear Double Resonance (ENDOR) has been carried out on carbonaceous pitches and their solutions. Large matrix and hyperfine ENDOR signals have been observed, the former being very sensitive to temperature, i.e. molecular motion. Measurements made over the temperature range -loo" to + 300Β°C indicate correlations of ENDOR response with glass transition temperatures of the pitches. The ENDOR of various concentrations of petroleum pitch in toluene suggests the presence of molecular association. Several previously unobserved spin population and phase phenomena have also been noted.

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