Surface Modification of Fumed Silica by Dry Silanization for PP/POE-based Dielectric Nanocomposites

Authors

  • Xiaozhen He University of Twente
  • Ilkka Rytöluoto Tampere University
  • Amirhossein Mahtabani University of Twente
  • Eetta Saarimäki VTT Technical Research Centre of Finland Ltd
  • Kari Lahti Tampere University
  • Mika Paajanen VTT Technical Research Centre of Finland Ltd
  • Rafal Anyszka University of Twente
  • Wilma Dierkes University of Twente
  • Anke Blume University of Twente

DOI:

https://doi.org/10.5324/nordis.v0i26.3272

Abstract

A systematic study of the influence of surface modification of nanosilica with coupling agents having different polarities on the dielectric properties of a PP/POE/silica blend was performed. The main goal of this investigation was to tailor the chemical composition of the silica surface, in order to modify the charge trapping properties of the nanocomposites. For the modification of the silica surface, a “green” approach was utilized: a dry silanization method, which is performed without the need of a solvent. The results of the thermogravimetric analysis (TGA) indicate that the dry process is an effective method to perform silica surface modification using alkoxysilanes.
The charge trapping properties were studied by Thermally Stimulated Depolarization Current (TSDC) measurements. The obtained TSDC results show significant differences in charge trapping properties of PP/POE composites filled with differently modified silicas. Polar functional groups attached to the surface of the silica appear to have a strong effect on the charge trapping properties: The trap depth distribution becomes deeper and the trap density decreases to significantly lower levels.
All results show that incorporation of surface modified nanosilica into a PP/POE matrix is a promising approach to tailor its dielectric properties. Further development of these composites may lead to benefits for application in high-voltage cable and capacitor applications.
Keywords: silica surface modification, dry silanization, charge trapping, PP, POE, TSDC, high voltage cable.

Downloads

Download data is not yet available.

Downloads

Published

2019-08-05

Issue

No. 26 (2019): Proceedings of the 26th Nordic Insulation Symposium

Section

Articles

License

Proceedings of the Nordic Insulation Symposium licenses all content of the journal under a Creative Commons Attribution (CC-BY) licence. This means, among other things, that anyone is free to copy and distribute the content, as long as they give proper credit to the author(s) and the journal. For further information, see Creative Commons website for human readable or lawyer readable versions.

Authors who publish with this journal agree to the following terms:

1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.

2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.

3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).