Silica surface modification with liquid rubbers & functional groups for new polyolefin-based dielectric nano-composites

Rafal Anyszka*, Xiaozhen He, Amirhossein Mahtabani, Ilkka Rytoluoto, Eetta Saarimaki, Kari Lahti, Mika Paajanen, Wilma Dierkes, Anke Blume

*Corresponding author for this work

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

Abstract

A novel hybrid approach for surface modification of nano-silica for polyolefin-based dielectric composites is presented. A fumed nano-silica was modified with long oligomeric chains of a liquid rubber, connected via urethane bonds to the silica surface increasing the compatibility with the matrix. Additionally, a secondary amino-silane was grafted in order to alter the charge trapping properties of the silica. The long oligomeric chains provide good dispersibility of the nanosilica in polypropylene/poly(ethylene-co-octene) (PP/POE) blends, while the functional urethane group along with a secondary amino-silane affected the charge trapping properties of the nano-composites by reducing the charge traps density and simultaneously increasing their depth. Scanning Electron Microscopy along with Differential Scanning Calorimetry revealed that the silica is preferably located in the PP phase, most likely due to its lower viscosity in comparison to POE. The silica particles exhibit a nucleating effect visible in a noticeable increase of the crystallization temperature of the PP phase, especially when the silica surface treatment is performed.

Original languageEnglish
Title of host publication2020 IEEE 3rd International Conference on Dielectrics, ICD 2020
PublisherIEEE
Pages213-216
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

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