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
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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Cite this

Rytöluoto, I., Niittymäki, M., Lahti, K., Saarimäki, E., Flyktman, T., Paajanen, M., & Karttunen, M. (2019). Silica-Polypropylene Nanocomposites for Film Capacitors: Structure–Property Studies and the Role of Biaxial Stretching Conditions. In Proceedings of the 26th Nordic Insulation Symposium, NORD-IS 19 (pp. 123-128). Proceedings of the Nordic Insulation Symposium, Vol.. 26 https://doi.org/10.5324/nordis.v0i26.3291