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

4 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
ISBN (Electronic)978-153-86638-9-9
Publication statusPublished - 19 Sep 2018
MoE publication typeNot Eligible
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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