Charging of cellular space-charge electret films in various gas atmospheres

Mika Paajanen, Michael Wegener, Reimund Gerhard-Multhaupt

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    11 Citations (Scopus)

    Abstract

    A strong electromechanical transducer effect is achieved in cellular polymer films e.g. by corona charging, which initiates charge separation inside the film. In order to create an effective charge separation, a high electric field is required. The electromechanical effect can be further enhanced by corona charging in high-pressure atmospheres or in various dielectric gases that have high, electrical breakdown strengths. The effect of the gas inside the cellular structure has also been studied. A higher electric field most likely causes more complete charging throughout the cellular film. The electromechanical effect corresponding to the piezoelectric d33 coefficient was enhanced after corona charging at 100-450 kPa or at 100-140 kPa in ambient nitrogen or in nitrous oxide, respectively, with corona voltages of up to 60 kV. The highest d33 coefficient of about 790 pCN-1 was achieved after replacing air with nitrogen gas inside the cellular structure through consecutive low and high-pressure treatments at 293 or at 313 K.
    Original languageEnglish
    Title of host publication2001 Annual Report Conference on Electrical Insulation And Dielectric Phenomena
    PublisherIEEE Institute of Electrical and Electronic Engineers
    Pages24-27
    ISBN (Print)0-7803-7053-8
    DOIs
    Publication statusPublished - 2001
    MoE publication typeB3 Non-refereed article in conference proceedings
    EventIEEE Conference on Electrical Insulation And Dielectric Phenomena, CEIDP 2001 - Kitchener, Canada
    Duration: 14 Oct 200117 Oct 2001

    Conference

    ConferenceIEEE Conference on Electrical Insulation And Dielectric Phenomena, CEIDP 2001
    Country/TerritoryCanada
    CityKitchener
    Period14/10/0117/10/01

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