Effects of nanofiller materials on the dielectric properties of epoxy nanocomposites

J. Katayama, Yoshimichi Ohki, N. Fuse, M. Kozako, T. Tanaka

    Research output: Contribution to journalArticle

    52 Citations (Scopus)

    Abstract

    Effects of nanofiller materials on typical dielectric properties of bisphenol-A epoxy resin were compared among three kinds of nanofillers, i. e. boehmite alumina, titania, and silica. In all the samples, the complex permittivity εr' and εr become significantly higher with an increase in temperature beyond 120 °C, especially at low frequencies. Such increase iinεr' and εr indicates the abundance of mobile charge carriers, which was verified by the space charge distribution measurements. All the samples show two peaks at 110 and 180 °C in the thermally stimulated depolarization current spectra. The lower-temperature peak is apparently caused by depolarization of dipoles induced by the glass transition, while the higher-temperature peak is due to the release of space charge. These characteristic properties appear more significantly in the nanocomposites with boehmite alumina and titania and less significantly in the nanocomposite with silica than in the neat epoxy esin. This indicates that the silica nanofillers give the best results as far as these properties cconcerned. The suppression of molecular motion by the addition of nanofillers seems to work effectively in the case of silica, while the nanofiller addition is likely to aaccelerate the motion of ionic carriers and/or that of dipoles in the case of boehmite alumina and titania.

    Original languageEnglish
    Article number6451354
    Pages (from-to)157-165
    Number of pages9
    JournalIEEE Transactions on Dielectrics and Electrical Insulation
    Volume20
    Issue number1
    DOIs
    Publication statusPublished - 2013

    Fingerprint

    Dielectric properties
    Nanocomposites
    Silica
    Alumina
    Titanium
    Depolarization
    Electric space charge
    Charge distribution
    Charge carriers
    Epoxy resins
    Temperature
    Glass transition
    Permittivity

    Keywords

    • complex permittivity
    • conductivity
    • epoxy resin
    • Nanocomposites
    • space charge distribution
    • thermally stimulated depolarization current

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Cite this

    Effects of nanofiller materials on the dielectric properties of epoxy nanocomposites. / Katayama, J.; Ohki, Yoshimichi; Fuse, N.; Kozako, M.; Tanaka, T.

    In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 20, No. 1, 6451354, 2013, p. 157-165.

    Research output: Contribution to journalArticle

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