A solid-state NMR study of cellulose degradation |
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| Authors: | Mushtaq Ali David C Apperley Christian D Eley Alan M Emsley Robin K Harris |
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| Institution: | (1) The National Grid Company plc, Kelvin Avenue, KT22 7ST Leatherhead, UK;(2) Industrial Research Laboratories, University of Durham, South Road, DH1 3LE Durham, UK;(3) National Power plc, Windmill Hill Business Park, Whitehill Way, SN5 6PB Swindon, UK;(4) Department of Chemistry, University of Surrey, GU2 5XH Guildford, Surrey, UK;(5) Department of Chemistry, University of Durham, South Road, DH1 3LE Durham, UK |
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| Abstract: | A series of laboratory-aged transformer insulating papers were investigated using solid-state NMR spectroscopy. Carbon-13 CPMAS, and proton MAS experiments were carried out along with static proton relaxation (T1, and T1 ) and free induction decay (FID) measurements. Some proton CRAMPS and proton-carbon-13 correlation (WISE) experiments were also undertaken. A change in the proton T1 and FID with ageing was detected. No detectable change was found in the proton T1. Some amorphous cellulose was detected in the carbon-13 spectrum. There was, however, no evidence for a substantial change in the nature of the cellulose with ageing. The carbon-13 spectra from some aged samples showed signals not present in the spectrum from an unaged sample. This was taken to be evidence of chemical degradation. Proton MAS and the WISE exeriment gave some information about the nature of the water in the sample. |
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| Keywords: | solid-state NMR cellulose degradation magic-angle spinning power transformers insulation |
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