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The effects of hydration on the DC breakdown strength of polyethylene composites employing oxide and nitride fillers

The effects of hydration on the DC breakdown strength of polyethylene composites employing oxide and nitride fillers
The effects of hydration on the DC breakdown strength of polyethylene composites employing oxide and nitride fillers
Particle dispersion, water absorption/desorption and electrical breakdown behavior were studied in a range of polyethylene composites having a common matrix morphology. Three different conditioning routes (dry, ambient and wet) were used to vary the absorbed water content. Systems employing oxide fillers (silica and alumina) were found to have poor or intermediate levels of particle dispersion and could absorb/desorb significant amounts of water. Consequently, they required drying to provide breakdown strengths comparable to that of the host matrix. Systems based on calcined silica exhibited reduced water absorption and provided improved breakdown strength after ambient conditioning, despite having an identical dispersion to those utilizing untreated silica. Composites employing nitride fillers (silicon nitride and aluminum nitride) were found to have good or intermediate levels of particle dispersion. These absorbed far less water and hence provided breakdown strength values comparable to that of the host matrix following ambient conditioning. Their breakdown strength was degraded after wet conditioning with both exhibiting similar breakdown strengths despite there being a large difference in the level of particle dispersion between the two fillers. In composites based upon a hydrophobic host matrix, water absorption is largely determined by particle surface chemistry and, although the above results are presented in terms of water absorption, we suggest that changes in this characteristic can be interpreted as a proxy for changed surface chemistry. The results suggest that surface chemistry is at least as important as particle dispersion in determining the electrical breakdown strength.
Composites, Water absorption, Morphology, Dielectric breakdown strength
3073-3082
Hosier, Ian
6a44329e-b742-44de-afa7-073f80a78e26
Praeger, Matthew
84575f28-4530-4f89-9355-9c5b6acc6cac
Vaughan, Alun
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Swingler, Steven
4f13fbb2-7d2e-480a-8687-acea6a4ed735
Hosier, Ian
6a44329e-b742-44de-afa7-073f80a78e26
Praeger, Matthew
84575f28-4530-4f89-9355-9c5b6acc6cac
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Swingler, Steven
4f13fbb2-7d2e-480a-8687-acea6a4ed735

Hosier, Ian, Praeger, Matthew, Vaughan, Alun and Swingler, Steven (2017) The effects of hydration on the DC breakdown strength of polyethylene composites employing oxide and nitride fillers. IEEE Transactions on Dielectrics & Electrical Insulation, 24 (5), 3073-3082. (doi:10.1109/TDEI.2017.006579).

Record type: Article

Abstract

Particle dispersion, water absorption/desorption and electrical breakdown behavior were studied in a range of polyethylene composites having a common matrix morphology. Three different conditioning routes (dry, ambient and wet) were used to vary the absorbed water content. Systems employing oxide fillers (silica and alumina) were found to have poor or intermediate levels of particle dispersion and could absorb/desorb significant amounts of water. Consequently, they required drying to provide breakdown strengths comparable to that of the host matrix. Systems based on calcined silica exhibited reduced water absorption and provided improved breakdown strength after ambient conditioning, despite having an identical dispersion to those utilizing untreated silica. Composites employing nitride fillers (silicon nitride and aluminum nitride) were found to have good or intermediate levels of particle dispersion. These absorbed far less water and hence provided breakdown strength values comparable to that of the host matrix following ambient conditioning. Their breakdown strength was degraded after wet conditioning with both exhibiting similar breakdown strengths despite there being a large difference in the level of particle dispersion between the two fillers. In composites based upon a hydrophobic host matrix, water absorption is largely determined by particle surface chemistry and, although the above results are presented in terms of water absorption, we suggest that changes in this characteristic can be interpreted as a proxy for changed surface chemistry. The results suggest that surface chemistry is at least as important as particle dispersion in determining the electrical breakdown strength.

Text
TDEI-6579 (Hosier) proofread version - Accepted Manuscript
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More information

Accepted/In Press date: 22 May 2017
e-pub ahead of print date: 27 December 2017
Published date: 31 December 2017
Keywords: Composites, Water absorption, Morphology, Dielectric breakdown strength
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 411125
URI: http://eprints.soton.ac.uk/id/eprint/411125
PURE UUID: 4840f27b-8a1f-411a-a1b1-eb0634df9cfd
ORCID for Ian Hosier: ORCID iD orcid.org/0000-0003-4365-9385
ORCID for Alun Vaughan: ORCID iD orcid.org/0000-0002-0535-513X

Catalogue record

Date deposited: 14 Jun 2017 16:31
Last modified: 10 Dec 2019 05:59

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