Controlled inflation of voids in cellular polymer ferroelectrets: Optimizing electromechanical transducer properties

M. Wegener (Corresponding Author), W. Wirges, R. Gerhard-Multhaupt, M. Dansachmüller, R. Schwödiauer, S. Bauer-Gogonea, S. Bauer, Mika Paajanen, Hannu Minkkinen, Jaakko Raukola

    Research output: Contribution to journalArticleScientificpeer-review

    130 Citations (Scopus)

    Abstract

    When exposed to sufficiently high electric fields, polymer-foam electret materials with closed cells exhibit ferroelectric-like behavior and may therefore be called ferroelectrets. In cellular ferroelectrets, the influence of the cell size and shape distributions on the application-relevant properties is not yet understood. Therefore, controlled inflation experiments were carried out on cellular polypropylene films, and the resulting elastical and electromechanical parameters were determined. The elastic modulus in the thickness direction shows a minimum with a corresponding maximum in the electromechanical transducer coefficient. The resonance frequency shifts as a function of the elastic modulus and the relative density of the inflated cellular films. Therefore, the transducer properties of cellular ferroelectrets can be optimized by means of controlled inflation.
    Original languageEnglish
    Pages (from-to)392 - 394
    Number of pages3
    JournalApplied Physics Letters
    Volume84
    Issue number3
    DOIs
    Publication statusPublished - 2004
    MoE publication typeA1 Journal article-refereed

    Keywords

    • polymer foams
    • polymer films
    • thin films
    • ferroelectric thin films
    • electrets
    • elastic moduli
    • dielectric resonance
    • piezoelectric transducers

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