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Effects of filler calcination on structure and dielectric properties of polyethylene/silica nanocomposites

Effects of filler calcination on structure and dielectric properties of polyethylene/silica nanocomposites
Effects of filler calcination on structure and dielectric properties of polyethylene/silica nanocomposites

This paper reports on an investigation of the effects of calcination on the structure and dielectric properties of polyethylene/silica (SiO2) nanocomposites. Calcination temperatures of 600 and 900 °C have been used in order to modify the surface chemistry and surface structure of the SiO2. The results show that, after calcination, the concentration of surface hydroxyl groups and water molecules around SiO2 and within resulting nanocomposites is reduced. The real permittivity of nanocomposites containing calcined SiO2 decreases compared to nanocomposites based on uncalcined SiO2. The DC breakdown strength of nanocomposites containing calcined SiO2 becomes higher than those containing uncalcined SiO2. In contrast, AC breakdown was found not to be significantly affected by addition of any of the silicas considered here. The use of calcined nanofillers can have positive effects akin to the use of chemically functionalized nanofillers in enhancing the dielectric properties of nanocomposites; both approaches remove polar surface hydroxyl groups.

breakdown, calcination, dielectric, nanocomposites, polyethylene, silica
1070-9878
284-291
Rahim, N.H.
d5b989a4-d1be-427b-b3a5-9c2f3a216f4e
Lau, K.Y.
2aaea8fa-2552-475d-a6fa-c65a544bc7c5
Muhamad, N.A.
d7ceefff-7713-4dac-98d1-4a9871446046
Mohamad, N.
dc4956cf-a478-4bef-8064-5a6bec9965ff
Rahman, W.A.W.A.
a8427c21-27f2-49b8-9930-7ba0080ad383
Vaughan, A.S.
6d813b66-17f9-4864-9763-25a6d659d8a3
Rahim, N.H.
d5b989a4-d1be-427b-b3a5-9c2f3a216f4e
Lau, K.Y.
2aaea8fa-2552-475d-a6fa-c65a544bc7c5
Muhamad, N.A.
d7ceefff-7713-4dac-98d1-4a9871446046
Mohamad, N.
dc4956cf-a478-4bef-8064-5a6bec9965ff
Rahman, W.A.W.A.
a8427c21-27f2-49b8-9930-7ba0080ad383
Vaughan, A.S.
6d813b66-17f9-4864-9763-25a6d659d8a3

Rahim, N.H., Lau, K.Y., Muhamad, N.A., Mohamad, N., Rahman, W.A.W.A. and Vaughan, A.S. (2019) Effects of filler calcination on structure and dielectric properties of polyethylene/silica nanocomposites. IEEE Transactions on Dielectrics and Electrical Insulation, 26 (1), 284-291, [8624229]. (doi:10.1109/TDEI.2018.007796).

Record type: Article

Abstract

This paper reports on an investigation of the effects of calcination on the structure and dielectric properties of polyethylene/silica (SiO2) nanocomposites. Calcination temperatures of 600 and 900 °C have been used in order to modify the surface chemistry and surface structure of the SiO2. The results show that, after calcination, the concentration of surface hydroxyl groups and water molecules around SiO2 and within resulting nanocomposites is reduced. The real permittivity of nanocomposites containing calcined SiO2 decreases compared to nanocomposites based on uncalcined SiO2. The DC breakdown strength of nanocomposites containing calcined SiO2 becomes higher than those containing uncalcined SiO2. In contrast, AC breakdown was found not to be significantly affected by addition of any of the silicas considered here. The use of calcined nanofillers can have positive effects akin to the use of chemically functionalized nanofillers in enhancing the dielectric properties of nanocomposites; both approaches remove polar surface hydroxyl groups.

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More information

Accepted/In Press date: 26 October 2018
e-pub ahead of print date: 23 January 2019
Published date: 1 February 2019
Keywords: breakdown, calcination, dielectric, nanocomposites, polyethylene, silica

Identifiers

Local EPrints ID: 430597
URI: http://eprints.soton.ac.uk/id/eprint/430597
ISSN: 1070-9878
PURE UUID: 4009aeb9-882a-41c5-b10e-1b61dfe8e854
ORCID for A.S. Vaughan: ORCID iD orcid.org/0000-0002-0535-513X

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Date deposited: 03 May 2019 16:30
Last modified: 30 Jan 2020 01:30

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Contributors

Author: N.H. Rahim
Author: K.Y. Lau
Author: N.A. Muhamad
Author: N. Mohamad
Author: W.A.W.A. Rahman
Author: A.S. Vaughan ORCID iD

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