Solution Modified Fumed Silica and Its Effect on Charge Trapping Behavior of PP/POE/Silica Nanodielectrics

Amirhossein Mahtabani (Contributor), Ilkka Rytöluoto (Contributor), Xiaozhen He, Eetta Saarimäki (Contributor), Kari Lahti (Contributor), Mika Paajanen (Contributor), Rafal Piotr Anyszka (Contributor), Wilma K. Dierkes (Contributor), Anke Blume (Contributor)

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Abstract

Various dielectric nanocomposite materials are studied in the frame of the European Commission funded project GRIDABLE. This project has the aim to develop DC cable extruded insulation and medium and low voltage DC capacitor films exhibiting enhanced performance with respect to presently used materials. The nanocomposites intended for cable applications are polypropylene (PP)/polyolefin elastomer (POE) blends filled with surface modified nano-silica particles. The surface modification is carried out via the state-of-the-art solution method using a polar silane as the modifying agent. Thermally Stimulated Depolarization Current (TSDC) measurements were carried out in order to study the charge trapping behavior of the nanocomposite samples. TSDC results indicate that the addition of the treated nano-silica, for most cases, reduces the density of the deep traps significantly. The effect of the addition of silica nanoparticles - both modified and unmodified - on the crystallinity of the samples was studied using X-ray Diffraction (XRD). This is important as the charge trapping properties of the nanodielectrics can be affected by the degree of crystallinity. While more detailed studies are necessary, these results imply that the depth and the density of the deep trap states is profoundly influenced by the level of the silica modification i.e. the amount of the grafted silane on the silica surface.
Original languageEnglish
Number of pages5
Publication statusPublished - 13 Jun 2019
Event26th Nordic Insulation Symposium on Materials, Components and Diagnostics - Tampere, Finland
Duration: 11 Jun 201913 Jun 2019
Conference number: 26

Conference

Conference26th Nordic Insulation Symposium on Materials, Components and Diagnostics
Abbreviated titleNORD-IS 2019
CountryFinland
CityTampere
Period11/06/1913/06/19

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Mahtabani, A., Rytöluoto, I., He, X., Saarimäki, E., Lahti, K., Paajanen, M., ... Blume, A. (2019). Solution Modified Fumed Silica and Its Effect on Charge Trapping Behavior of PP/POE/Silica Nanodielectrics. Paper presented at 26th Nordic Insulation Symposium on Materials, Components and Diagnostics, Tampere, Finland.