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

    Polymer nanocomposites are attracting attention as emerging insulating materials. We measured the thermally stimulated depolarization current (TSDC) in low-density polyethylene (LDPE)/MgO nanocomposites while varying measuring such parameters as the temperature increase rate and the intensity of the applied electric field. A TSDC peak that spreads over a wide temperature range from 0 °C to 60 °C was observed in all samples. As the amount of MgO nanofiller 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 about 12 °C was found not to appear in the base LDPE. Analysis of its initial rising portion indicated that the 12 °C peak had a fairly large energy depth of about 2 eV. These results indicate that charge carriers tend to be captured more strongly after the addition of MgO nanofillers. If these captured charge carriers induce homocharge layers in the vicinity of the electrodes, further space charge formation would be suppressed. This seems to explain the fact that the amount of space charge is smaller in nanocomposites with a proper addition of MgO than in the base LDPE.

    Original languageEnglish
    Pages (from-to)1-7
    Number of pages7
    JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
    Volume176
    Issue number3
    DOIs
    Publication statusPublished - 2011 Aug

    Fingerprint

    Depolarization
    Low density polyethylenes
    Dielectric properties
    Nanocomposites
    Charge carriers
    Electric space charge
    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
    • Energy Engineering and Power Technology

    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: Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi), Vol. 176, No. 3, 08.2011, p. 1-7.

    Research output: Contribution to journalArticle

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