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Ageing behaviour of a polyethylene blend: influence of chemical defects and morphology on charge transport

Ageing behaviour of a polyethylene blend: influence of chemical defects and morphology on charge transport
Ageing behaviour of a polyethylene blend: influence of chemical defects and morphology on charge transport
The properties of novel cable insulation systems will rely critically upon the morphology of the material. Here, a blend of high and low density polyethylene was processed in order to generate three sets of samples with different morphologies. The influence of thermo-oxidative ageing at 120 °C was then considered. The resulting chemical changes included the introduction of unsaturation and oxygen-containing groups and was determined by antioxidant consumption and oxygen permeability. Such chemical defects were found to be concentrated in the fraction of each system that was molten at 120 °C and, consequently, served to inhibit recrystallisation following ageing. The resulting spatial distribution of charge trapping sites was therefore strongly dependent on morphology. The electrical conductivity of each system varied non-monotonically with ageing: short times reduced the conductivity; a rapid increase in conductivity over five orders of magnitude occurred beyond a critical ageing threshold. Despite the pronounced structural differences between the morphologically distinct sets of samples, all exhibited comparable conductivity values beyond this threshold, implying that while charge transport is strongly influence by chemical factors, crystallinity is relatively unimportant. This experimental finding appears at odds with theoretical studies of the electronic states in crystalline and amorphous polyethylene.
charge transport, morphology, polyethylene blends
2397-7264
Tantipattarakul, Somyot
ce711fa4-35a2-4880-a83e-fd10e4bc3cfb
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Tantipattarakul, Somyot
ce711fa4-35a2-4880-a83e-fd10e4bc3cfb
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c

Tantipattarakul, Somyot, Vaughan, Alun and Andritsch, Thomas (2020) Ageing behaviour of a polyethylene blend: influence of chemical defects and morphology on charge transport. High Voltage. (In Press)

Record type: Article

Abstract

The properties of novel cable insulation systems will rely critically upon the morphology of the material. Here, a blend of high and low density polyethylene was processed in order to generate three sets of samples with different morphologies. The influence of thermo-oxidative ageing at 120 °C was then considered. The resulting chemical changes included the introduction of unsaturation and oxygen-containing groups and was determined by antioxidant consumption and oxygen permeability. Such chemical defects were found to be concentrated in the fraction of each system that was molten at 120 °C and, consequently, served to inhibit recrystallisation following ageing. The resulting spatial distribution of charge trapping sites was therefore strongly dependent on morphology. The electrical conductivity of each system varied non-monotonically with ageing: short times reduced the conductivity; a rapid increase in conductivity over five orders of magnitude occurred beyond a critical ageing threshold. Despite the pronounced structural differences between the morphologically distinct sets of samples, all exhibited comparable conductivity values beyond this threshold, implying that while charge transport is strongly influence by chemical factors, crystallinity is relatively unimportant. This experimental finding appears at odds with theoretical studies of the electronic states in crystalline and amorphous polyethylene.

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More information

Submitted date: 25 December 2019
Accepted/In Press date: 24 February 2020
Keywords: charge transport, morphology, polyethylene blends

Identifiers

Local EPrints ID: 437215
URI: http://eprints.soton.ac.uk/id/eprint/437215
ISSN: 2397-7264
PURE UUID: 16d0b121-2c36-43dd-a85d-6baa5152e1ae
ORCID for Somyot Tantipattarakul: ORCID iD orcid.org/0000-0001-5814-1277
ORCID for Alun Vaughan: ORCID iD orcid.org/0000-0002-0535-513X
ORCID for Thomas Andritsch: ORCID iD orcid.org/0000-0002-3462-022X

Catalogue record

Date deposited: 22 Jan 2020 17:30
Last modified: 22 Nov 2021 03:05

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Contributors

Author: Somyot Tantipattarakul ORCID iD
Author: Alun Vaughan ORCID iD
Author: Thomas Andritsch ORCID iD

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