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Structure and Electrical Properties of Silicone Rubber Filled with Thermally Reduced Graphene Oxide
KTH, School of Chemical Science and Engineering (CHE).
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. ABB Corp Res, Sweden.
2016 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 23, no 2, p. 1156-1163Article in journal (Refereed) Published
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Abstract [en]

Graphene oxide (GO) was heat treated at different temperatures between 120 and 220 degrees C and the structural changes were assessed by thermogravimetry, infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscopy (SEM). The resulting reduced graphene oxide (rGO) fillers showed markedly lower oxygen contents (primarily by reduction of epoxide and hydroxyl groups) than GO. SEM of silicone rubber composites containing 3 wt.% rGO or GO filler showed that the nanoparticles were uniformly distributed in the polymer. The rGO-filled composites exhibited electric field-dependent resistivity; the resistivity decreased from 10(14) to 10(11) ohm m as the electric field was increased from 0.2 to 6 kV (mm)(-1). The composites exhibited an increased resistivity after being exposed to a combined thermal cycling and electrical field. An increase in the resistivity of samples aged at 120 degrees C for more than 17 h was observed; the resistivity-electric field behavior and the dielectric constant of the aged composite resembled that of GO-filled composite. The composites exhibited dielectric constant values between 4.0 and 5.2 and a low tan delta (<= 0.015) at frequencies between 10(-2) and 10(4) Hz. The results suggest that the resistivity of the composites can be tuned by adjusting the degree of reduction of GO. The low rGO-filler content that was required to achieve this adequate property profile is attractive, which makes these composites potentially useful as electric field-grading material in HVDC cable accessories. However, this requires that the long-term stability problem can be sensible addressed.

Place, publisher, year, edition, pages
IEEE , 2016. Vol. 23, no 2, p. 1156-1163
Keywords [en]
Graphene oxide, silicone rubber, nanocomposite, electric stress control, electric field grading material, resistive field grading, HVDC cable accessories
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-189400DOI: 10.1109/TDEI.2015.005485ISI: 000377461500065Scopus ID: 2-s2.0-84973454888OAI: oai:DiVA.org:kth-189400DiVA, id: diva2:947960
Note

QC 20160708

Available from: 2016-07-08 Created: 2016-07-04 Last updated: 2017-12-15Bibliographically approved

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Li, Wangshu

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Li, WangshuGedde, Ulf W.Hillborg, Henrik
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