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  • 1.
    Li, Wangshu
    et al.
    KTH, School of Chemical Science and Engineering (CHE).
    Gedde, Ulf W.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Hillborg, Henrik
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. ABB Corp Res, Sweden.
    Structure and Electrical Properties of Silicone Rubber Filled with Thermally Reduced Graphene Oxide2016In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 23, no 2, p. 1156-1163Article in journal (Refereed)
    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.

  • 2.
    Li, Wangshu
    et al.
    KTH, School of Chemical Science and Engineering (CHE).
    Hillborg, Henrik
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. ABB, Sweden.
    Gedde, Ulf W.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Influence of Process Conditions and Particle Dispersion on the AC Breakdown Strength of Polyethylene-aluminium Oxide Nanocomposites2015In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 22, no 6, p. 3536-3542Article in journal (Refereed)
    Abstract [en]

    The voltage level in power transmission systems is increasing in order to transmit energy more efficiently and this requires efficient insulating materials. The dielectric breakdown strength of polymers used as electrical insulation can be increased by the addition of inorganic nanoparticles. A uniform particle dispersion is however important; large agglomerates may have a negative effect on the breakdown strength. The effects of temperature, screw rotation velocity and processing time in a micro-extruder on the dispersion of neat aluminium oxide nanoparticles in LDPE were studied, and it was possible to obtain an essentially agglomerate-free particle dispersion at optimum extrusion conditions. Smaller particle agglomerates (< 3 mu m) had no significantly negative impact on the AC dielectric breakdown strength. Composites with higher filler fractions (>= 3 wt.%) containing larger particle agglomerates (>15 mu m in diameter) showed a significant reduction in the breakdown strength compared to the neat polymer.

  • 3.
    Li, Wangshu
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    LDPE/AI203 Nanocomposites and Reduced Graphene Oxide Filled PDMS used as Insulating and Electric Field Grading Materials in HVDC Cable Systems2015Licentiate thesis, comprehensive summary (Other academic)
  • 4.
    Li, Wangshu
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Hillborg, Henrik
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. ABB, Sweden.
    Gedde, Ulf
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Influence of process conditions and particle dispersion on the ac breakdown strength of polyethylene-aluminium oxide nanocompositesManuscript (preprint) (Other academic)
  • 5.
    Li, Wangshu
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Gedde, Ulf
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Hillborg, Henrik
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. ABB, Sweden.
    Structure and electrical properties of silicone nanocomposites filled with thermally reduced graphene oxcideManuscript (preprint) (Other academic)
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