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On the influence of morphology and chemical defects on change transport dynamics in polyethylene: thermal ageing and concentration gradient

On the influence of morphology and chemical defects on change transport dynamics in polyethylene: thermal ageing and concentration gradient
On the influence of morphology and chemical defects on change transport dynamics in polyethylene: thermal ageing and concentration gradient
A blend composed of a high-density polyethylene and a low-density polyethylene was subjected to thermo-oxidative ageing at 160 °C, under conditions where oxygen diffusion effects lead to a non-uniform distribution of chemical defects throughout the specimens. The existence of highly and lightly oxidised regions was demonstrated by Fourier transform infrared spectroscopy and confocal Raman microprobe spectroscopy and the effect of these on the dielectric behaviour of the system was investigated. Dielectric spectroscopy revealed a broad loss peak at frequencies above 1 Hz that increases in strength with increasing ageing time, which we associate with the motion of polar chain segments within the polymer. For ageing times below 3 h, samples exhibited reduced conductivity under a constant electric field compared with the initial unaged system; above 3 h, the conductivity was found to increase monotonically with ageing time and corresponded to the appearance of an additional low frequency (<1 Hz) dielectric loss process and marked migration of space charge into the bulk away from the relevant physical electrode. This change in behaviour was found to occur abruptly and the final distribution of space charge was found to correlate well with the distribution of ageing inducing chemical defects within the system. From these observations, the effects of chemical defects on charge transport dynamics are discussed.
0021-8979
1-15
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 (2019) On the influence of morphology and chemical defects on change transport dynamics in polyethylene: thermal ageing and concentration gradient. Journal of Applied Physics, 52 (39), 1-15. (doi:10.1088/1361-6463/ab2f38).

Record type: Article

Abstract

A blend composed of a high-density polyethylene and a low-density polyethylene was subjected to thermo-oxidative ageing at 160 °C, under conditions where oxygen diffusion effects lead to a non-uniform distribution of chemical defects throughout the specimens. The existence of highly and lightly oxidised regions was demonstrated by Fourier transform infrared spectroscopy and confocal Raman microprobe spectroscopy and the effect of these on the dielectric behaviour of the system was investigated. Dielectric spectroscopy revealed a broad loss peak at frequencies above 1 Hz that increases in strength with increasing ageing time, which we associate with the motion of polar chain segments within the polymer. For ageing times below 3 h, samples exhibited reduced conductivity under a constant electric field compared with the initial unaged system; above 3 h, the conductivity was found to increase monotonically with ageing time and corresponded to the appearance of an additional low frequency (<1 Hz) dielectric loss process and marked migration of space charge into the bulk away from the relevant physical electrode. This change in behaviour was found to occur abruptly and the final distribution of space charge was found to correlate well with the distribution of ageing inducing chemical defects within the system. From these observations, the effects of chemical defects on charge transport dynamics are discussed.

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On the influence of morphology and chemical defects on charge transport dynamics in polyethylene: thermal ageing and concentration gradient - Version of Record
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In preparation date: 2019
Accepted/In Press date: 4 July 2019
e-pub ahead of print date: 24 July 2019
Published date: 25 September 2019

Identifiers

Local EPrints ID: 432441
URI: https://eprints.soton.ac.uk/id/eprint/432441
ISSN: 0021-8979
PURE UUID: b80ccf70-b421-49ee-bd50-d00e9058d743
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

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Date deposited: 12 Jul 2019 16:40
Last modified: 04 Dec 2019 01:37

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Contributors

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

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