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The effect of organoclay loading and matrix morphology on charge transport and dielectric breakdown in an ethylene-based polymer blend

The effect of organoclay loading and matrix morphology on charge transport and dielectric breakdown in an ethylene-based polymer blend
The effect of organoclay loading and matrix morphology on charge transport and dielectric breakdown in an ethylene-based polymer blend
The effect of an organoclay on the electrical properties of a polymeric host is described. The matrix was composed of a blend of high and low density polyethylene, such that a wide range of different morphologies could be generated, to which an ethylene/(vinyl acetate) copolymer was added, to increase compatibility between the organoclay and the matrix and, thereby, improve the organoclay dispersion. The ratio between the compatibiliser and organoclay was found to be important in forming a well-dispersed system, as evinced by thermogravimetric analysis, X-ray diffraction and scanning electron microscopy, indicating the effectiveness of the chosen compatibilisation strategy. DC conductivity was found to be determined by the precise distribution of the organoclay throughout the system; changes in morphology and phase structure of the matrix polymer resulting from changes in imposed thermal history had little effect per se, but varying degrees of self-assembly of the organoclay facilitated by different residence times within the quiescent melt could result in changes in overall DC conductivity of several orders of magnitude. Consequent increases in DC conductivity led to reductions in DC breakdown strength, implying failure through some avalanche or thermal process. However, a monotonic increase in observed AC breakdown strength implies that the associated underlying failure process is then very different.
Polymer nanocomposites, Organoclay, Polyethylene, Dielectric Breakdown, Compatibiliser
0022-2461
1-12
Shaw, Allison, Vivienne
fc27d683-8a43-476c-b5c9-85a49e08f17f
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Shaw, Allison, Vivienne
fc27d683-8a43-476c-b5c9-85a49e08f17f
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c

Shaw, Allison, Vivienne, Vaughan, Alun and Andritsch, Thomas (2019) The effect of organoclay loading and matrix morphology on charge transport and dielectric breakdown in an ethylene-based polymer blend. Journal of Materials Science, 1-12. (doi:10.1007/s10853-019-03765-5).

Record type: Article

Abstract

The effect of an organoclay on the electrical properties of a polymeric host is described. The matrix was composed of a blend of high and low density polyethylene, such that a wide range of different morphologies could be generated, to which an ethylene/(vinyl acetate) copolymer was added, to increase compatibility between the organoclay and the matrix and, thereby, improve the organoclay dispersion. The ratio between the compatibiliser and organoclay was found to be important in forming a well-dispersed system, as evinced by thermogravimetric analysis, X-ray diffraction and scanning electron microscopy, indicating the effectiveness of the chosen compatibilisation strategy. DC conductivity was found to be determined by the precise distribution of the organoclay throughout the system; changes in morphology and phase structure of the matrix polymer resulting from changes in imposed thermal history had little effect per se, but varying degrees of self-assembly of the organoclay facilitated by different residence times within the quiescent melt could result in changes in overall DC conductivity of several orders of magnitude. Consequent increases in DC conductivity led to reductions in DC breakdown strength, implying failure through some avalanche or thermal process. However, a monotonic increase in observed AC breakdown strength implies that the associated underlying failure process is then very different.

Text
Shaw 2019 PE J Mat Sci The Effect Of Organoclay Loading - Version of Record
Available under License Creative Commons Attribution.
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More information

In preparation date: 2018
Accepted/In Press date: 4 June 2019
Published date: 17 June 2019
Keywords: Polymer nanocomposites, Organoclay, Polyethylene, Dielectric Breakdown, Compatibiliser

Identifiers

Local EPrints ID: 431600
URI: https://eprints.soton.ac.uk/id/eprint/431600
ISSN: 0022-2461
PURE UUID: 36c0498f-063a-4d62-bc81-95ca465ee208
ORCID for Allison, Vivienne Shaw: ORCID iD orcid.org/0000-0001-9726-312X
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: 10 Jun 2019 16:31
Last modified: 10 Dec 2019 01:49

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