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
    Country/TerritoryCanada
    CityVancouver, BC
    Period14/10/0717/10/07

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