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

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


Original languageEnglish
Title of host publicationProceedings of the 26th Nordic Insulation Symposium
PublisherNordic Insulation Symposium
Publication statusPublished - 8 Aug 2019
Publication typeA4 Article in a conference publication
EventNordic Insulation Symposium -
Duration: 1 Jan 1900 → …

Publication series

Name Proceedings of the Nordic Insulation Symposium
PublisherNordic Insulation Symposium
ISSN (Electronic)2535-3969


ConferenceNordic Insulation Symposium
Period1/01/00 → …


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.