Influence of polar and unpolar silica functionalization on the dielectric properties of PP/POE nanocomposites

Xiaozhen He, Paolo Seri, Ilkka Rytoluoto, Rafal Anyszka, Minna Niittymaki, Amirhossein Mahtabani, Hadi Naderiallaf, Eetta Saarimaki, Kari Lahti, Mika Paajanen, Wilma Dierkes, Anke Blume

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

1 Citation (Scopus)

Abstract

This study focuses on the influence of polar and unpolar surface functionalization of silica on the dielectric performance of PP/POE (polypropylene/poly(ethylene-cooctene)) nanocomposites. The silica fillers were surface-modified with unpoalr trimethylethoxysilane (TMES) or polar 3- aminopropyl triethoxysilane (APTES). Fourier-Transform Infrared Spectroscopy and Thermogravimetric analysis were performed and confirmed qualitatively and quantitatively the successful silica-silane modification. Silica/PP/POE nanocomposite films were prepared using a mini-extruder. Scanning Electron Microscope images showed good dispersion of the modified silica in the PP/POE matrix. However, the polar silica cluster size (300 nm) is slightly larger than the one of the unpolar silica (100 nm). Thermally Stimulated Depolarization Current (TSDC) characterization data showed that the polar silica introduced deeper charge traps than the unpolar one, which also showed higher trap density. The apparent conductivity measured during the TSDC poling phase indicated that the polar silica filled nanocomposites featured very fast polarization to reach the saturation state, while the unpolar silica had a rather slow polarization rate. From Pulsed Electroacoustic Analysis it was obvious that the space charge is suppressed by addition of the polar silica, but increased by the presence of the unpolar silica.
Original languageEnglish
Title of host publication2020 IEEE 3rd International Conference on Dielectrics, ICD 2020
PublisherIEEE
Pages229-232
Number of pages4
ISBN (Electronic)9781728189833
DOIs
Publication statusPublished - 4 Feb 2021
Event3rd IEEE International Conference on Dielectrics, ICD 2020 - Virtual, Valencia, Spain
Duration: 5 Jul 20209 Jul 2020
Conference number: 3

Conference

Conference3rd IEEE International Conference on Dielectrics, ICD 2020
Abbreviated titleICD 2020
CountrySpain
CityVirtual, Valencia
Period5/07/209/07/20

Keywords

  • Silicon compounds
  • Nanocomposites
  • Conductivity
  • Space charge
  • Dielectrics
  • Steady-state
  • Velocity measurement

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