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Influence of Nanoparticle Surface Coating on Electrical Conductivity of LDPE/Al2O3 Nanocomposites for HVDC Cable Insulations
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0003-2201-2806
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-5867-0531
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0003-4774-4341
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2017 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 24, no 3, p. 1396-1404Article in journal (Refereed) Published
Abstract [en]

LDPE/metal oxide nanocomposites are promising materials for future high-voltage DC cable insulation. This paper presents data on the influence of the structure of the nanoparticle coating on the electrical conductivity of LDPE/Al2O3 nanocomposites. Al2O3 nanoparticles, 50 nm in size, were coated with a series of silanes with terminal alkyl groups of different lengths (methyl, n-octyl and n-octadecyl groups). The density of the coatings in vacuum was between 200 and 515 kg m(-3,) indicating substantial porosity in the coating. The dispersion of the nanoparticles in the LDPE matrix was assessed based on statistics for the nearest-neighbor particle distance. The electrical conductivity of the nanocomposites was determined at both 40 and 60 degrees C. The results show that an appropriate surface coating on the nanoparticles allowed uniform particle dispersion up to a filler loading of 10 wt.%, with a maximum reduction in the electrical conductivity by a factor of 35. The composites based on the most porous octyl-coated nanoparticles showed the greatest reduction in electrical conductivity and the lowest temperature coefficient of electrical conductivity of the composites studied.

Place, publisher, year, edition, pages
IEEE, 2017. Vol. 24, no 3, p. 1396-1404
Keywords [en]
HVDC cable insulation, LDPE/aluminum oxide nanocomposites, particle coating chemistry, particle dispersion, electrical conductivity
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-211613DOI: 10.1109/TDEI.2017.006310ISI: 000405000300012Scopus ID: 2-s2.0-85022181728OAI: oai:DiVA.org:kth-211613DiVA, id: diva2:1130710
Funder
Swedish Foundation for Strategic Research , EM11-0022
Note

QC 20170810

Available from: 2017-08-10 Created: 2017-08-10 Last updated: 2017-08-11Bibliographically approved

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Liu, DongmingPourrahimi, Amir MasoudPallon, Love K. H.Nilsson, FritjofOlsson, Richard T.Hedenqvist, Mikael S.Gedde, Ulf W.

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Liu, DongmingPourrahimi, Amir MasoudPallon, Love K. H.Nilsson, FritjofOlsson, Richard T.Hedenqvist, Mikael S.Gedde, Ulf W.
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Fibre and Polymer Technology
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IEEE transactions on dielectrics and electrical insulation
Electrical Engineering, Electronic Engineering, Information Engineering

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