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Dielectric Breakdown Properties of Mechanically Recycled SiO2–BOPP Nanocomposites

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


Original languageEnglish
Title of host publicationIEEE 1st International Conference on Dielectrics (ICD)
Place of PublicationMontpellier, France
Number of pages5
ISBN (Electronic)9781509028023
ISBN (Print)978-1-5090-2803-0
Publication statusPublished - 3 Jul 2016
Publication typeA4 Article in a conference publication
EventIEEE international conference on dielectrics -
Duration: 1 Jan 2000 → …


ConferenceIEEE international conference on dielectrics
Period1/01/00 → …


This paper reports on the effects of multiple compounding cycles on the structural, chemical, rheological and DC dielectric breakdown properties of bi-axially oriented silica–polypropylene nanocomposite films. While the effect of multiple compounding cycles on the silica particle agglomeration remains seemingly modest according to the quantitative structural analysis, the recompounding is found to markedly affect the steady shear viscosity and film processability. Fourier transform infrared spectroscopy is utilized to ascertain that no thermo-oxidative degradation is occurring during the processing. The large-area multi-breakdown measurements indicate a ~13 % shift towards higher DC dielectric strength after the second recompounding cycle, an effect which is believed to be attributable mainly to the changes in film processability. Surprisingly, a 75:25 mixture of the virgin and three-times-reprocessed nanocompounds exhibits a similar increase in dielectric strength. Particularly from the processing perspective, the results emphasize the necessity of careful consideration of property modifications upon incorporation of nanofillers.


  • Bi-axially oriented polypropylene, nanocomposite, silica, reprocessing, dielectric breakdown

Publication forum classification

Field of science, Statistics Finland