Voided cyclo-olefin polymer films: ferroelectrets with high thermal stability

M. Wegener, Mika Paajanen, O. Voronina, Robert Schulze, W. Wirges, R. Gerhard-Multhaupt

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

    16 Citations (Scopus)

    Abstract

    Recently, new ferroelectrets were developed from foams of polyethylene terephthalate and of cyclo-olefin polymers and copolymers. Here, we focus on ferroelectret films based on compounds of cyclo-olefin polymers. Suitable compounding and preparation led to cyclo-olefin polymer ferroelectrets which show an electromechanical activity of around 15 pC/N that is thermally stable at least up to 110/spl deg/C. We discuss the preparation, the electrical charging and the electromechanical activity, the short-and long-term thermal stability as well as the electro-acoustical properties of an eight-layer cyclo-olefin film stack. The results obtained on the cyclo-olefin foams represent a significant improvement of the service temperature of ferroelectret transducer materials.
    Original languageEnglish
    Title of host publication2005 12th International Symposium on Electrets
    PublisherIEEE Institute of Electrical and Electronic Engineers
    Pages47-50
    ISBN (Print)0-7803-9116-0
    DOIs
    Publication statusPublished - 2005
    MoE publication typeA4 Article in a conference publication
    Event12th International Symposium on Electrets, ISE-12 - Salvador, Brazil
    Duration: 11 Sep 200514 Sep 2005

    Conference

    Conference12th International Symposium on Electrets, ISE-12
    CountryBrazil
    CitySalvador
    Period11/09/0514/09/05

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