Thioxanthone derivatives as stabilizers against electrical breakdown in cross-linked polyethylene for high voltage cable applications

Harald Wutzel, Markus Jarvid, Jonas Bjuggren, Anette Johansson, Villgot Englund, Stanislaw Gubanski, Mats R. Andersson

    Research output: Contribution to journalArticlepeer-review

    32 Citations (Scopus)

    Abstract

    In the search of voltage stabilizers for high voltage underground cables the chemical synthesis and electrical tree inhibiting effect of a series of thioxanthone derivatives in cross-linked low-density polyethylene (XLPE) is reported. The strongest increase in electrical tree initiation field under high-voltage alternating current (HVAC) conditions was 55% compared to reference XLPE after the addition of 0.3 wt% 9-oxo-9H-thioxanthen-2-yl methacrylate. Thermal analysis, small angle X-ray scattering and gel content measurements showed that the addition of the stabilizers did not significantly influence the microstructure and gel fraction of XLPE. A comparison between the stabilizing effects of the thioxanthone derivatives and previously reported photophysical properties revealed that a short lifetime of the triplet excited state can be related to a good voltage-stabilizing effect.

    Original languageEnglish
    Pages (from-to)63-69
    Number of pages7
    JournalPolymer Degradation and Stability
    Volume112
    DOIs
    Publication statusPublished - Feb 2015

    Keywords

    • Electrical treeing
    • High voltage insulation
    • Polyethylene
    • Polymer degradation
    • Thioxanthones

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