Change search
ReferencesLink to record
Permanent link

Direct link
Dielectric Properties and Resistance to Corona and Ozone of Epoxy Compositions Filled with Micro- and Nano-fillers
Show others and affiliations
2009 (English)In: Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, 2009, -380 p.Conference paper (Refereed)
Abstract [en]

This paper describes activities aiming to evaluate and compare the resistance to a prolonged corona and ozone exposure for a range of epoxy based compositions filled with micro- and nano-fillers of silica at different proportions. It has been earlier shown for this system that substitution of 5 wt% of micro-filler by nano-filler slightly improved mechanical properties, yielding an increase in Young's modulus, tensile strength and elongation at break. At the same time, the toughness of the systems decreased with the addition of nano-fillers indicating a poor particle-matrix interaction, which was in accordance with the prior art claiming that this interaction is weaker in case of SiO 2 nano-particles, as for example compared to Al 2O 3 nano-particles. For the exposure to corona and ozone a methodology employing a multiple-needle electrode system was used, as recommended by CIGRE working group WG D1.14. Measurements of surface resistivity, bulk resistivity as well as dielectric response (DR) at broad frequency range (10 -4-10 3 Hz) were performed on new samples of the investigated compositions and after each of two sequences of the corona-ozone treatment, lasting 100hours each. It was found that the long-term corona-ozone exposure had obvious effect on surface resistivity for all the compositions investigated and the contents of the micro- and nano-fillers played a significant role in the observed changes. On the other hand, bulk resisitivity, dielectric permittivity as well as dissipation factor, all being the properties of material bulk, did not exhibit high sensitivity to the exposure.

Place, publisher, year, edition, pages
2009. -380 p.
National Category
Other Natural Sciences
URN: urn:nbn:se:kth:diva-160161DOI: 10.1109/CEIDP.2009.5377787ISI: 000279096900092ScopusID: 2-s2.0-77949327591OAI: diva2:788980
2009 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP; Virginia Beach, VA; United States

QC 20150217

Available from: 2015-02-17 Created: 2015-02-17 Last updated: 2015-02-18Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Hollertz, Rebecca
Other Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 64 hits
ReferencesLink to record
Permanent link

Direct link