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

Hill D.J.T., Le T.T. and Whittaker A.K. (1994) A technique for the quantitative measurements of signal intensities in cellulose-based transformer insulators by13C CPMAS NMR. Cellulose, 1 4: 237-247. doi:10.1007/BF00812507


Author Hill D.J.T.
Le T.T.
Whittaker A.K.
Title A technique for the quantitative measurements of signal intensities in cellulose-based transformer insulators by13C CPMAS NMR
Journal name Cellulose   Check publisher's open access policy
ISSN 0969-0239
Publication date 1994-01-01
Sub-type Article (original research)
DOI 10.1007/BF00812507
Volume 1
Issue 4
Start page 237
End page 247
Total pages 11
Publisher Kluwer Academic Publishers
Subject 2507 Polymers and Plastics
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
Keyword 13C CPMAS NMR
insulation paper
quantitative intensities
relaxation times
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 14 Jun 2016, 10:50:40 EST by System User