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The effect of water absorption on the dielectric properties of polyethylene hexagonal boron nitride nanocomposites

The effect of water absorption on the dielectric properties of polyethylene hexagonal boron nitride nanocomposites
The effect of water absorption on the dielectric properties of polyethylene hexagonal boron nitride nanocomposites
The effect of water absorption on the dielectric response of polyethylene/hexagonal boron nitride nanocomposites has been studied by dielectric spectroscopy. The nanocomposites have been prepared with hBN concentrations ranging from 2 wt% to 30 wt%. Fourier transform infrared spectroscopy and thermogravimetric analysis revealed a very small amount of hydroxyl groups on the surface of hBN. Mass loss measurements showed that the nanocomposites did not absorb any water under ambient and dry conditions while there was some water absorption under wet conditions. The dielectric spectroscopy results showed a broad relaxation peak, indicative of different states of water with water shells of different thickness, which moved to higher frequencies with increasing water content. However, the dielectric losses were significantly lower than the losses reported in the literature of nanocomposites under wet conditions. In addition, all the absorbed water was successfully removed under vacuum conditions which demonstrated that the interactions between the water and the nanocomposites were very weak, due to the hydrophobic nature of the hBN surface. This is a highly useful property, when considering these materials for applications in electrical insulation.
1361-6463
1-12
Ayoob, Raed
9520a234-f49a-45b9-ba23-c4d0e500da14
Alhabill, Fuad N.F.
253d8162-b329-46cc-ace6-5e39a8caca33
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Ayoob, Raed
9520a234-f49a-45b9-ba23-c4d0e500da14
Alhabill, Fuad N.F.
253d8162-b329-46cc-ace6-5e39a8caca33
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3

Ayoob, Raed, Alhabill, Fuad N.F., Andritsch, Thomas and Vaughan, Alun (2018) The effect of water absorption on the dielectric properties of polyethylene hexagonal boron nitride nanocomposites. Journal of Physics D: Applied Physics, 51 (6), 1-12. (doi:10.1088/1361-6463/aaa306).

Record type: Article

Abstract

The effect of water absorption on the dielectric response of polyethylene/hexagonal boron nitride nanocomposites has been studied by dielectric spectroscopy. The nanocomposites have been prepared with hBN concentrations ranging from 2 wt% to 30 wt%. Fourier transform infrared spectroscopy and thermogravimetric analysis revealed a very small amount of hydroxyl groups on the surface of hBN. Mass loss measurements showed that the nanocomposites did not absorb any water under ambient and dry conditions while there was some water absorption under wet conditions. The dielectric spectroscopy results showed a broad relaxation peak, indicative of different states of water with water shells of different thickness, which moved to higher frequencies with increasing water content. However, the dielectric losses were significantly lower than the losses reported in the literature of nanocomposites under wet conditions. In addition, all the absorbed water was successfully removed under vacuum conditions which demonstrated that the interactions between the water and the nanocomposites were very weak, due to the hydrophobic nature of the hBN surface. This is a highly useful property, when considering these materials for applications in electrical insulation.

Text H20 and DS in hBN-PE_14-08-2017 - Accepted Manuscript
Restricted to Repository staff only until 18 March 2019.
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Accepted/In Press date: 19 December 2017
e-pub ahead of print date: 23 January 2018

Identifiers

Local EPrints ID: 416602
URI: https://eprints.soton.ac.uk/id/eprint/416602
ISSN: 1361-6463
PURE UUID: 14d7a93b-b58f-4ca1-b370-5cdfa1a16f70
ORCID for Thomas Andritsch: ORCID iD orcid.org/0000-0002-3462-022X

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Date deposited: 03 Jan 2018 17:30
Last modified: 06 Jun 2018 12:24

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