Silica-Polypropylene Nanocomposites for Film Capacitors: Structure–Property Studies and the Role of Biaxial Stretching Conditions

Ilkka Rytöluoto, Minna Niittymäki, Kari Lahti, Eetta Saarimäki, Timo Flyktman, Mika Paajanen, Mikko Karttunen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Biaxial-stretching-induced morphology development and dielectric properties of hydrophobic fumed silica-BOPP nanocomposite films were investigated. The precursor (cast) film morphology, pre-heating as well as biaxial stretching
    temperature and stretch ratio were found to profoundly affect the silica-BOPP film bulk morphology, surface texture and the formation of particle/agglomerate-induced cavitation upon biaxial stretching. Isothermal high-field conductivity and thermally stimulated depolarization current measurements indicated decreasing high-field/high-temperature conductivity
    and modification of trap density of states upon incorporation of nanosilica in comparison to neat BOPP. Large-area DC dielectric strength is, however, sensitive to thermal/mechanical stresses upon biaxial stretching, hence necessitating careful optimization of the nanocomposite formulation and processing.
    Original languageEnglish
    Title of host publicationProceedings of the 26th Nordic Insulation Symposium, NORD-IS 19
    PublisherNordic Insulation Symposium
    Pages123-128
    DOIs
    Publication statusPublished - 8 Aug 2019
    MoE publication typeA4 Article in a conference publication
    Event26th Nordic Insulation Symposium on Materials, Components and Diagnostics, NORD-IS 19 - Tampere, Finland
    Duration: 12 Jun 201914 Jun 2019
    http://www.tut.fi/nordis19/

    Publication series

    SeriesProceedings of the Nordic Insulation Symposium
    Volume26
    ISSN2535-3969

    Conference

    Conference26th Nordic Insulation Symposium on Materials, Components and Diagnostics, NORD-IS 19
    CountryFinland
    CityTampere
    Period12/06/1914/06/19
    Internet address

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