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Influence of gamma-irradiation on space charge formation in low-density polyethylene

Influence of gamma-irradiation on space charge formation in low-density polyethylene
Influence of gamma-irradiation on space charge formation in low-density polyethylene
Energetic ionising radiation can alter the chemical structure of polymeric materials by various mechanisms and may also give rise to the presence of trapped charge within the material, the trapping characteristics of which can be influenced by these radiation-induced structural alterations. In the present work, the formation of space charge in irradiated low-density polyethylene (LDPE) was investigated using a laser-induced pressure pulse (LIPP). Specimens of LDPE, 350 /spl mu/m thick, were irradiated in a /sup 60/Co /spl gamma/-source in room air to various doses and the results indicate that space-charge distributions are dependent on both dose and applied electric stress, including the length of time for which the stress is applied. For example, at a dose of 10 kGy or less a stress of 25 kV/mm results in an abundance of positive charge adjacent to the cathode. As the stress is increased to 60 kV/mm the positive charge extends to the anode. At doses above 50 kGy, however, charge formation within the dielectric becomes more complicated in that as well as having positive charge adjacent to both electrodes there can be a substantial negative charge in the middle of the test specimen.
821-824
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Banford, H.M.
1d02669b-d91a-49f9-a9ff-051bdcbdd172
Davies, A.E.
56d95222-b259-494a-92e9-68b090ec0dcd
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Banford, H.M.
1d02669b-d91a-49f9-a9ff-051bdcbdd172
Davies, A.E.
56d95222-b259-494a-92e9-68b090ec0dcd

Chen, G., Banford, H.M. and Davies, A.E. (1996) Influence of gamma-irradiation on space charge formation in low-density polyethylene. Conference on Electrical Insulation and Dielectric Phenomena - CEIDP '96, Millbrae, United States. pp. 821-824 . (doi:10.1109/CEIDP.1996.564634).

Record type: Conference or Workshop Item (Other)

Abstract

Energetic ionising radiation can alter the chemical structure of polymeric materials by various mechanisms and may also give rise to the presence of trapped charge within the material, the trapping characteristics of which can be influenced by these radiation-induced structural alterations. In the present work, the formation of space charge in irradiated low-density polyethylene (LDPE) was investigated using a laser-induced pressure pulse (LIPP). Specimens of LDPE, 350 /spl mu/m thick, were irradiated in a /sup 60/Co /spl gamma/-source in room air to various doses and the results indicate that space-charge distributions are dependent on both dose and applied electric stress, including the length of time for which the stress is applied. For example, at a dose of 10 kGy or less a stress of 25 kV/mm results in an abundance of positive charge adjacent to the cathode. As the stress is increased to 60 kV/mm the positive charge extends to the anode. At doses above 50 kGy, however, charge formation within the dielectric becomes more complicated in that as well as having positive charge adjacent to both electrodes there can be a substantial negative charge in the middle of the test specimen.

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More information

Published date: 1996
Venue - Dates: Conference on Electrical Insulation and Dielectric Phenomena - CEIDP '96, Millbrae, United States, 1996-10-23
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 253499
URI: https://eprints.soton.ac.uk/id/eprint/253499
PURE UUID: 46783698-e84b-40fb-baa9-7d94e43931c7

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Date deposited: 12 Oct 2000
Last modified: 19 Dec 2018 17:30

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Contributors

Author: G. Chen
Author: H.M. Banford
Author: A.E. Davies

University divisions

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