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On the influence of chemical defects and structural factors on charge transport and failure in polyethylene

On the influence of chemical defects and structural factors on charge transport and failure in polyethylene
On the influence of chemical defects and structural factors on charge transport and failure in polyethylene
A blend of high and low density polyethylene was aged at 160 °C in air and the impact of the chosen aging protocol on local chemistry, crystallinity and charge transport dynamics was considered. The aging conditions were chosen in order to exploit oxygen diffusion effects, such that the resulting systems could be considered as bi-layer specimens, containing two regions: a uniform lightly aged layer and a more spatially varying highly aged layer, which vary in the concentrations of aging-related defects such as carbonyl groups and unsaturation. For aging periods up to 3 h, little space charge was found within both the highly and lightly aged layers. However, after aging for about 3.5 h, an abrupt change in behavior was observed, whereby charges move rapidly through the highly aged layer, accumulating at the interface with the lightly aged layer. Sample melting behavior, as determined by differential scanning calorimetry, was found to depend on aging time, as a result of impeded crystallization and retarded reorganization kinetics. We suggest that this abrupt change in charge transport behavior is a consequence of the local concentration of chemically related trapping sites exceeding some critical threshold. The consequence of the resulting space charge distribution is a dramatic increase in the local electric field across the lightly aged layer and a consequent reduction in the overall DC breakdown strength. However, while further aging exacerbates these space charge effects, counter to expectations, the breakdown strength then recovers somewhat, suggesting a change in the underlying mechanism of electrical failure.
aging, dielectric breakdown, polyethylene, space charge
1070-9878
288-295
Tantipattarakul, S.
ce711fa4-35a2-4880-a83e-fd10e4bc3cfb
Vaughan, A.S.
6d813b66-17f9-4864-9763-25a6d659d8a3
Andritsch, T.
8681e640-e584-424e-a1f1-0d8b713de01c
Tantipattarakul, S.
ce711fa4-35a2-4880-a83e-fd10e4bc3cfb
Vaughan, A.S.
6d813b66-17f9-4864-9763-25a6d659d8a3
Andritsch, T.
8681e640-e584-424e-a1f1-0d8b713de01c

Tantipattarakul, S., Vaughan, A.S. and Andritsch, T. (2020) On the influence of chemical defects and structural factors on charge transport and failure in polyethylene. IEEE Transactions on Dielectrics and Electrical Insulation, 27 (1), 288-295, [8985645]. (doi:10.1109/TDEI.2019.008473).

Record type: Article

Abstract

A blend of high and low density polyethylene was aged at 160 °C in air and the impact of the chosen aging protocol on local chemistry, crystallinity and charge transport dynamics was considered. The aging conditions were chosen in order to exploit oxygen diffusion effects, such that the resulting systems could be considered as bi-layer specimens, containing two regions: a uniform lightly aged layer and a more spatially varying highly aged layer, which vary in the concentrations of aging-related defects such as carbonyl groups and unsaturation. For aging periods up to 3 h, little space charge was found within both the highly and lightly aged layers. However, after aging for about 3.5 h, an abrupt change in behavior was observed, whereby charges move rapidly through the highly aged layer, accumulating at the interface with the lightly aged layer. Sample melting behavior, as determined by differential scanning calorimetry, was found to depend on aging time, as a result of impeded crystallization and retarded reorganization kinetics. We suggest that this abrupt change in charge transport behavior is a consequence of the local concentration of chemically related trapping sites exceeding some critical threshold. The consequence of the resulting space charge distribution is a dramatic increase in the local electric field across the lightly aged layer and a consequent reduction in the overall DC breakdown strength. However, while further aging exacerbates these space charge effects, counter to expectations, the breakdown strength then recovers somewhat, suggesting a change in the underlying mechanism of electrical failure.

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Accepted_Manuscript_IEEE_8473_proofed_Rev_24.10.19 - Accepted Manuscript
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Accepted/In Press date: 24 October 2019
e-pub ahead of print date: 6 February 2020
Published date: February 2020
Keywords: aging, dielectric breakdown, polyethylene, space charge

Identifiers

Local EPrints ID: 438467
URI: http://eprints.soton.ac.uk/id/eprint/438467
ISSN: 1070-9878
PURE UUID: 8b009ae3-3b55-4cf3-9810-bc86f334366a
ORCID for S. Tantipattarakul: ORCID iD orcid.org/0000-0001-5814-1277
ORCID for A.S. Vaughan: ORCID iD orcid.org/0000-0002-0535-513X
ORCID for T. Andritsch: ORCID iD orcid.org/0000-0002-3462-022X

Catalogue record

Date deposited: 11 Mar 2020 17:30
Last modified: 26 Nov 2021 03:01

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Contributors

Author: S. Tantipattarakul ORCID iD
Author: A.S. Vaughan ORCID iD
Author: T. Andritsch ORCID iD

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