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A technique for the quantitative measurements of signal intensities in cellulose-based transformer insulators by13C CPMAS NMR

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Abstract

A full investigation of the13C CPMAS relaxation times for samples of virgin and aged insulation paper material has revealed the quantitative aspects of the CPMAS technique. We observe, as have others, that the peak due to methyloxy carbon C6 in the solid-state spectrum is reduced in intensity, compared with the other peaks, by ca. 7%. This is a direct result of the difference in relaxation times for the different carbon nuclei. It is shown that simplifying assumptions concerning the relative magnitude of the relaxation times used in the analysis of cross-polarization dynamics are not valid in these materials. In particular, the13C spin-lattice relaxation time in the rotating frame (13C T1ρ

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Authors and Affiliations

  1. Polymer Materials and Degradation Group, Department of Chemistry, and Centre for Magnetic Resonance, University of Queensland, 4072, Queensland, Australia

    David J. T. Hill, Tri T. Le & Andrew K. Whittaker

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  1. David J. T. Hill
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  2. Tri T. Le
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  3. Andrew K. Whittaker
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Hill, D.J.T., Le, T.T. & Whittaker, A.K. A technique for the quantitative measurements of signal intensities in cellulose-based transformer insulators by13C CPMAS NMR. Cellulose 1, 237–247 (1994). https://doi.org/10.1007/BF00812507

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