Charging behavior and thermal stability of porous and non-porous polytetrafluoroethylene (PTFE) electrets

M. Wegener, W. Wirges, Mika Paajanen, R. Gerhard

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

1 Citation (Scopus)

Abstract

In view of the high piezoelectric activity found on some cellular polymer electret films, polymeric space-charge electretswere studied more frequently during the last ten years. An alternative concept – between cellular electret materials and devices with non-porous electret films – are layer systems of porous and non-porous electret films. Such layer systems exhibit the typical properties of ferroelectrets. In the late nineties, there were several investigations on the charging behavior of porous PTFE, but the main research focus shifted to new cellular ferroelectrets such as polyolefins and polyesters. Today, the additional expertise with polymer ferroelectrets may help to study and better understand the charging behavior of porous PTFE films. In this contribution, maximum charging levels and thermal charge stabilities of porous PTFE films are analyzed. As expected, the charging behavior is strongly influenced by the porosity of the polymer film. Mechanisms that limit the maximum charging levels – such as breakdown-induced conduction – are identified. The thermal stability of trapped charges is tested, and the light emission during the dielectricbarrier discharges of the charging process is briefly described.
Original languageEnglish
Title of host publicationAnnual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2007
Place of PublicationPiscataway, NJ, USA
PublisherIEEE Institute of Electrical and Electronic Engineers
Pages449-452
ISBN (Print)978-1-4244-1481-9, 978-1-4244-1482-6
DOIs
Publication statusPublished - 2007
MoE publication typeA4 Article in a conference publication
EventIEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2007 - Vancouver, BC, Canada
Duration: 14 Oct 200717 Oct 2007

Conference

ConferenceIEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2007
Abbreviated titleCEIDP 2007
CountryCanada
CityVancouver, BC
Period14/10/0717/10/07

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  • Cite this

    Wegener, M., Wirges, W., Paajanen, M., & Gerhard, R. (2007). Charging behavior and thermal stability of porous and non-porous polytetrafluoroethylene (PTFE) electrets. In Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2007 (pp. 449-452). IEEE Institute of Electrical and Electronic Engineers. https://doi.org/10.1109/CEIDP.2007.4451621