Title :
NMR relaxation behaviour of cellulose transformer insulation paper
Author :
Darveniza, M. ; Hill, D.J.T. ; Le, T.T. ; Whittaker, A.K.
Author_Institution :
Dept. of Chem., Queensland Univ., Brisbane, Qld., Australia
Abstract :
The CP/MAS 13C NMR spectra of insulation paper have been investigated and the time constants 1H T1p, 13C T1p and TCH have been measured for each carbon atom in the cellulose structure. The data are indicative of morphological heterogeneity in the crystalline and amorphous regions. The relatively large value of 13C T1p compared to 1H T1p explains the reported low values observed for the intensity of carbon C6 in the amorphous region. The crystallinity of insulation paper measured by NMR was found to be approximately 40 percent and independent of the age of the paper
Keywords :
nuclear magnetic resonance; nuclear spin-lattice relaxation; paper; polymer structure; power transformer insulation; proton magnetic resonance; 13C T1p; 1H T1p; CP/MAS 13C NMR spectra; Kraft paper; NMR relaxation behaviour; TCH; amorphous region; cellulose structure; cellulose transformer insulation paper; crystallinity; morphological heterogeneity; time constants; Amorphous materials; Atomic measurements; Crystallization; Dielectrics and electrical insulation; Mechanical factors; Nuclear magnetic resonance; Oil insulation; Power transformer insulation; Power transformers; Temperature;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1994., Proceedings of the 4th International Conference on
Conference_Location :
Brisbane, Qld.
Print_ISBN :
0-7803-1307-0
DOI :
10.1109/ICPADM.1994.414128
