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A Raman microprobe study of electrical treeing in polyethylene

A Raman microprobe study of electrical treeing in polyethylene
A Raman microprobe study of electrical treeing in polyethylene
The chemical nature of electrical tree growth in a blend of high and low density polyethylene has been studied by confocal Raman microprobe spectroscopy. The observed spectra, which are easily perturbed by the Raman probe beam, can be described in terms of three components, the relative intensities of which vary from place-to-place on the sample. Throughout the body of the tree, the usual Raman bands of polyethylene are seen, but superimposed upon a pronounced fluorescent background. This suggests a degree of material degradation throughout the structure, even where there is no visible evidence of electrical discharge damage or ageing. The individual channels that make up the fractal structure of the tree can then be divided into two distinct categories. Within the core of the tree, their Raman spectra are made up of two elements; fluorescence, plus the G and D bands of sp 2 hybridized carbon. Here, the tree channels are best thought of as hollow tubules surrounded by a carbonaceous shell. At the tips, the channels are characterized simply by the Raman bands of polyethylene superimposed upon a reduced fluorescent background, irrespective of their size. That is, in this region, the tree channels are simply hollow tubules within the dielectric. The transition between these two structures occurs relatively abruptly. These observations are related to the treeing process.
0022-2461
181-191
Vaughan, A.S.
6d813b66-17f9-4864-9763-25a6d659d8a3
Dodd, S.J.
a9916381-232d-40ce-a90f-e11de356dca6
Sutton, S.J.
571c7136-1eb6-44e1-8979-ca0829469a6b
Vaughan, A.S.
6d813b66-17f9-4864-9763-25a6d659d8a3
Dodd, S.J.
a9916381-232d-40ce-a90f-e11de356dca6
Sutton, S.J.
571c7136-1eb6-44e1-8979-ca0829469a6b

Vaughan, A.S., Dodd, S.J. and Sutton, S.J. (2004) A Raman microprobe study of electrical treeing in polyethylene. Journal of Materials Science, 39 (1), 181-191.

Record type: Article

Abstract

The chemical nature of electrical tree growth in a blend of high and low density polyethylene has been studied by confocal Raman microprobe spectroscopy. The observed spectra, which are easily perturbed by the Raman probe beam, can be described in terms of three components, the relative intensities of which vary from place-to-place on the sample. Throughout the body of the tree, the usual Raman bands of polyethylene are seen, but superimposed upon a pronounced fluorescent background. This suggests a degree of material degradation throughout the structure, even where there is no visible evidence of electrical discharge damage or ageing. The individual channels that make up the fractal structure of the tree can then be divided into two distinct categories. Within the core of the tree, their Raman spectra are made up of two elements; fluorescence, plus the G and D bands of sp 2 hybridized carbon. Here, the tree channels are best thought of as hollow tubules surrounded by a carbonaceous shell. At the tips, the channels are characterized simply by the Raman bands of polyethylene superimposed upon a reduced fluorescent background, irrespective of their size. That is, in this region, the tree channels are simply hollow tubules within the dielectric. The transition between these two structures occurs relatively abruptly. These observations are related to the treeing process.

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More information

Published date: January 2004
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 259074
URI: http://eprints.soton.ac.uk/id/eprint/259074
ISSN: 0022-2461
PURE UUID: c7d6c5f6-9e69-49c5-8250-95c66b2c5692
ORCID for A.S. Vaughan: ORCID iD orcid.org/0000-0002-0535-513X

Catalogue record

Date deposited: 12 Mar 2004
Last modified: 03 Dec 2019 01:54

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Contributors

Author: A.S. Vaughan ORCID iD
Author: S.J. Dodd
Author: S.J. Sutton

University divisions

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