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On the effect of functionalizer chain length and water content in polyethylene/silica nanocomposites: Part I — Dielectric properties and breakdown strength

On the effect of functionalizer chain length and water content in polyethylene/silica nanocomposites: Part I — Dielectric properties and breakdown strength
On the effect of functionalizer chain length and water content in polyethylene/silica nanocomposites: Part I — Dielectric properties and breakdown strength
A series of nanoparticles was prepared by functionalizing a commercial nanosilica with alkylsilanes of varying alkyl tail length, from propyl to octadecyl. By using a constant molar concentration of silane, the density of alkyl groups attached to each system should be comparable. The effect of chain length on the structure of the resulting nanosilica/polyethylene nanocomposites was examined and comparison with an unfilled reference system revealed that, other than through a weak nucleating effect, the inclusion of the nanosilica does not affect the matrix structure. Since water interacts strongly with applied electric fields, water was used as a dielectric probe in conjunction with dielectric spectroscopy to examine the effect of the nanofiller and its surface chemistry on the system. Sets of samples were prepared through equilibrating under ambient conditions, vacuum drying and water immersion. While the water content of the unfilled polymer was not greatly affected, the water content of the nanocomposites varied over a wide range as a result of water accumulation, in a range of states, at nanoparticle interfaces. The effect of water content on breakdown behavior was also explored and, in the unfilled polymer, the breakdown strength was found to depend little on exposure to water (~13% reduction). In all the nanocomposites, the increased propensity for these systems to absorb water meant that the breakdown strength was dramatically affected (>66% reduction).
Nanotechnology, Dielectric Breakdown, Conductivity, Silica, Polyethylene, Water
1698-1707
Hosier, Ian
6a44329e-b742-44de-afa7-073f80a78e26
Praeger, Matthew
84575f28-4530-4f89-9355-9c5b6acc6cac
Holt, Alex
9aab8a69-bccc-4a51-81d5-56fe1002c569
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Swingler, Steven
4f13fbb2-7d2e-480a-8687-acea6a4ed735
Hosier, Ian
6a44329e-b742-44de-afa7-073f80a78e26
Praeger, Matthew
84575f28-4530-4f89-9355-9c5b6acc6cac
Holt, Alex
9aab8a69-bccc-4a51-81d5-56fe1002c569
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Swingler, Steven
4f13fbb2-7d2e-480a-8687-acea6a4ed735

Hosier, Ian, Praeger, Matthew, Holt, Alex, Vaughan, Alun and Swingler, Steven (2017) On the effect of functionalizer chain length and water content in polyethylene/silica nanocomposites: Part I — Dielectric properties and breakdown strength. IEEE Transactions on Dielectrics & Electrical Insulation, 24 (3), 1698-1707. (doi:10.1109/TDEI.2017.005788).

Record type: Article

Abstract

A series of nanoparticles was prepared by functionalizing a commercial nanosilica with alkylsilanes of varying alkyl tail length, from propyl to octadecyl. By using a constant molar concentration of silane, the density of alkyl groups attached to each system should be comparable. The effect of chain length on the structure of the resulting nanosilica/polyethylene nanocomposites was examined and comparison with an unfilled reference system revealed that, other than through a weak nucleating effect, the inclusion of the nanosilica does not affect the matrix structure. Since water interacts strongly with applied electric fields, water was used as a dielectric probe in conjunction with dielectric spectroscopy to examine the effect of the nanofiller and its surface chemistry on the system. Sets of samples were prepared through equilibrating under ambient conditions, vacuum drying and water immersion. While the water content of the unfilled polymer was not greatly affected, the water content of the nanocomposites varied over a wide range as a result of water accumulation, in a range of states, at nanoparticle interfaces. The effect of water content on breakdown behavior was also explored and, in the unfilled polymer, the breakdown strength was found to depend little on exposure to water (~13% reduction). In all the nanocomposites, the increased propensity for these systems to absorb water meant that the breakdown strength was dramatically affected (>66% reduction).

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Submitted date: 22 December 2015
Accepted/In Press date: 8 February 2017
e-pub ahead of print date: 29 June 2017
Published date: 1 July 2017
Keywords: Nanotechnology, Dielectric Breakdown, Conductivity, Silica, Polyethylene, Water
Organisations: EEE

Identifiers

Local EPrints ID: 382016
URI: http://eprints.soton.ac.uk/id/eprint/382016
PURE UUID: 245cfa87-a72c-4d61-b09c-5e946cf10fc6
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: 23 Oct 2015 08:52
Last modified: 17 Dec 2019 01:52

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