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

Volume

2

fYear

1994

fDate

3-8 Jul 1994

Firstpage

784

Abstract

The CP/MAS ¹³C NMR spectra of insulation paper have been investigated and the time constants ¹H T_1p, ¹³C T_1p and T_CH 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 T_1p compared to ¹H T_1p 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 T_1p; ¹H T_1p; CP/MAS ¹³C NMR spectra; Kraft paper; NMR relaxation behaviour; T_CH; 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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICPADM.1994.414128

Filename

414128