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Endor studies of carbon black and carbon black-polymer composites

✍ Scribed by R.P. Veregin; J.R. Harbour; Y. Kotake; E.G. Janzen

Publisher: Elsevier Science
Year: 1987
Tongue: English
Weight: 458 KB
Volume: 25
Category: Article
ISSN: 0008-6223
DOI: 10.1016/0008-6223(87)90195-3

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✦ Synopsis

Electron-nuclear double resonance (ENDOR) spectra have been obtained at the free proton frequency for a carbon black and a carbon black-polymer composite, at temperatures ranging from 130 K to 350 K. The ENDOR spectra show an unusual dependence on the saturation of the associated homogeneously broadened ESR resonance, as "non-saturating" microwave power gives rise to largest ENDOR enhancements. This behaviour is attributed to a "lineshift" ENDOR mechanism. In the composite, the polymer 'H nuclei contribute very strongly to the ENDOR signal, and this signal shows a marked dependence on molecular motion within the polymer.

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