ESR Detection of Carbonaceous Mesophase Embryo

ESR spectra of vanadyl complexes in Knafji residue were measured in the temperature range 20-420°C. Each complex has a typically axially anisotropic structure at room temperature. The spectra became completely isotropic above 385°C, and the rotational correlation time τc of the vanadyl complexes was...

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Bibliographic Details
Published inKOBUNSHI RONBUNSHU Vol. 43; no. 5; pp. 315 - 317
Main Authors SHIBATA, Kaoru, ARITA, Seiji, SOHMA, Junkichi
Format Journal Article
LanguageJapanese
Published The Society of Polymer Science, Japan 1986
Subjects
Carbonaceous Mesophase
Electron Spin Resonance
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Summary:ESR spectra of vanadyl complexes in Knafji residue were measured in the temperature range 20-420°C. Each complex has a typically axially anisotropic structure at room temperature. The spectra became completely isotropic above 385°C, and the rotational correlation time τc of the vanadyl complexes was estimated. Up to 400°Cτc decreased with increasing temperature, but beyond 400°C it began to increase with increasing temperature. Based on this contradiction between the temperature dependence ofτc and that of the viscosity, the formation of a carbonaceous mesophase embryo is discussed. The apparent activation energy for the formation of the embryo was estimated to be 39 kcal/mol from the Arrhenius plot of the rate constant.
ISSN:0386-2186
1881-5685
DOI:10.1295/koron.43.315