Comparison of nano-structuration effects in polypropylene among four typical dielectric properties

Norikazu Fuse, Yoshimichi Ohki, Toshikatsu Tanaka

    Research output: Contribution to journalArticle

    33 Citations (Scopus)

    Abstract

    Effects of nanofiller addition on four typical dielectric properties, namely permittivity εr', dielectric loss factor εr'', space charge accumulation, and partial discharge (PD) resistance were evaluated for polypropylene (PP) and its nanocomposites (NCs) with nanoclay. While εr' and εr'' are almost independent of temperature and frequency in the base unfilled PP, they are highly dependent on the two parameters in the two NCs. Namely, εr' increases significantly at temperatures above 20 °C and the frequency spectrum of εr'' shows at least one temperature-dependent peak. Furthermore, space charge appears abundantly in the two NCs compared to the base PP. These results indicate that plenty of mobile carriers and/or dipoles, probably resulted from the manufacturing process, remain in the two NCs. Notwithstanding the above-mentioned 'inferior' insulating properties, the two NCs have an improved PD resistance compared with the base PP. Namely, the erosion depth on the surface induced by PDs is the smallest in the NC with the largest filler content, while it is the largest in the base PP. Such differences in the effects of nanofillers on different insulating properties are attributable to the fact that nanofillers can improve the PD resistance simply by their presence, while the chemicals needed for uniform dispersion of nanofillers may sometimes increase the permittivity and abundance of charge carriers.

    Original languageEnglish
    Article number5492237
    Pages (from-to)671-677
    Number of pages7
    JournalIEEE Transactions on Dielectrics and Electrical Insulation
    Volume17
    Issue number3
    DOIs
    Publication statusPublished - 2010 Jun

    Fingerprint

    Dielectric properties
    Polypropylenes
    Nanocomposites
    Partial discharges
    Electric space charge
    Permittivity
    Dielectric losses
    Charge carriers
    Temperature
    Fillers
    Erosion

    Keywords

    • Complex permittivity
    • Nanocomposites
    • Partial discharge resistance
    • Polypropylene
    • Space charge polarization

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Cite this

    Comparison of nano-structuration effects in polypropylene among four typical dielectric properties. / Fuse, Norikazu; Ohki, Yoshimichi; Tanaka, Toshikatsu.

    In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 17, No. 3, 5492237, 06.2010, p. 671-677.

    Research output: Contribution to journalArticle

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