Compounding, Structure and Dielectric Properties of Silica-BOPP Nanocomposite Films

Ilkka Rytoluoto (Corresponding author), Mikael Ritamaki, Kari Lahti, Mika Paajanen, Mikko Karttunen, Gian Carlo Montanari, Paolo Seri, Hadi Naderiallaf

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

    7 Citations (Scopus)


    This study presents preliminary results on the morphology, structure and dielectric properties of laboratory scale cast and biaxially oriented silica-PP films, currently being developed in the European project GRIDABLE. Space charge measurements on the thick cast films indicated a reduction of positive space charge and faster depolarization characteristics upon inclusion of nano-silica, being indicative of reduction of trap depth and density distribution in comparison to neat PP. Likewise, for the biaxially oriented silica-PP thin films, increased amount of shallow traps and a reduction of concentration of traps in the deep trap range (∼ eV) were observed. Nano-silica was also found to reduce the dielectric loss at high temperatures in the frequency range appropriate to use. Such dielectric property modifications can potentially lead to benefits for insulation reliability and lifetime, especially at higher temperatures. A two-step compounding via a master batch approach was also found to be a viable option for the up-scaling of nanocomposite production.

    Original languageEnglish
    Title of host publication2018 IEEE 2nd International Conference on Dielectrics
    Subtitle of host publicationICD 2018
    PublisherIEEE Institute of Electrical and Electronic Engineers
    Number of pages4
    ISBN (Electronic)978-153-86638-9-9
    Publication statusPublished - 19 Sept 2018
    MoE publication typeA4 Article in a conference publication
    Event2nd IEEE International Conference on Dielectrics, ICD 2018 - Budapest, Hungary
    Duration: 1 Jul 20185 Jul 2018
    Conference number: 2


    Conference2nd IEEE International Conference on Dielectrics, ICD 2018
    Abbreviated titleICD 2018


    • Dielectric loss
    • Nanocomposite
    • Permittivity
    • Polypropylene
    • Silica
    • Space charge
    • Thin film processing
    • Trapping


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