Electron-nuclear double resonance (endor) of pitches

A 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 temperatur...

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Bibliographic Details
Published in:Carbon (New York) 1984, Vol.22 (6), p.487-492
Main Authors: Singer, L.S., Lewis, I.C.
Format: Article
Language:English
Subjects:
Applied sciences
Coal and petroleum industry by products processing
Energy
Exact sciences and technology
Fuel processing. Carbochemistry and petrochemistry
Fuels
Other techniques and industries
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Summary:A 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 − 100° to + 300°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.
ISSN:0008-6223
1873-3891
DOI:10.1016/0008-6223(84)90080-0