Thermally stimulated current in low-density polyethylene/MgO nanocomposite - On the mechanism of its superior dielectric properties

Kazuyuki Ishimoto, Toshikatsu Tanaka, Yoshimichi Ohki, Yoitsu Sekiguchi, Yoshinao Murata

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    Recently polymer nanocomposite has been attracting much attention as an emerging insulating material. In this paper, we measured thermally stimulated depolarization current (TSDC) in low-density polyethylene (LDPE)/MgO nanocomposite by changing measuring parameters such as the temperature increasing rate and the intensity of electric field applied. As a result, a TSDC peak that spreads over a wide temperature range from 0 °C to 60 °C was observed in all the samples. As the amount of MgO nano-filler increases, the TSDC peak height decreases. Furthermore, by adopting a partial heating method, the wide TSDC peak was resolved into several component peaks. Among them, the peak at around 12 °C was found not to appear in the base LDPE. By analyzing its initial rising portion, the 12-°C peak was assumed to have a fairly deep energy depth of about 2 eV. These results indicate that charge carriers tend to be captured more strongly by the addition of MgO nano-fillers. If these captured charge carriers induce homocharge layers in the vicinity of the electrodes further formation of space charge would be suppressed. This seems to explain the fact that the amount of space charge is smaller in the nanocomposite with a proper addition of MgO than in the base LDPE.

    Original languageEnglish
    JournalIEEJ Transactions on Fundamentals and Materials
    Volume129
    Issue number2
    DOIs
    Publication statusPublished - 2009

    Fingerprint

    Depolarization
    Low density polyethylenes
    Dielectric properties
    Nanocomposites
    Charge carriers
    Electric space charge
    Fillers
    Insulating materials
    Electric fields
    Heating
    Temperature
    Electrodes
    Polymers

    Keywords

    • Insulating material
    • Low-density polyethylene
    • Polymer nanocomposite
    • Thermally stimulated current

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Cite this

    Thermally stimulated current in low-density polyethylene/MgO nanocomposite - On the mechanism of its superior dielectric properties. / Ishimoto, Kazuyuki; Tanaka, Toshikatsu; Ohki, Yoshimichi; Sekiguchi, Yoitsu; Murata, Yoshinao.

    In: IEEJ Transactions on Fundamentals and Materials, Vol. 129, No. 2, 2009.

    Research output: Contribution to journalArticle

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