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.
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19 January 2004
Research Article|
January 19 2004
Controlled inflation of voids in cellular polymer ferroelectrets: Optimizing electromechanical transducer properties
M. Wegener;
M. Wegener
Applied Condensed-Matter Physics, University of Potsdam, Am Neuen Palais 10, D-14469 Potsdam, Germany
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W. Wirges;
W. Wirges
Applied Condensed-Matter Physics, University of Potsdam, Am Neuen Palais 10, D-14469 Potsdam, Germany
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R. Gerhard-Multhaupt;
R. Gerhard-Multhaupt
Applied Condensed-Matter Physics, University of Potsdam, Am Neuen Palais 10, D-14469 Potsdam, Germany
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M. Dansachmüller;
M. Dansachmüller
Soft-Matter Physics, Johannes Kepler University, Altenberger Strasse 69, A-4040 Linz, Austria
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R. Schwödiauer;
R. Schwödiauer
Soft-Matter Physics, Johannes Kepler University, Altenberger Strasse 69, A-4040 Linz, Austria
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S. Bauer-Gogonea;
S. Bauer-Gogonea
Soft-Matter Physics, Johannes Kepler University, Altenberger Strasse 69, A-4040 Linz, Austria
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S. Bauer;
S. Bauer
Soft-Matter Physics, Johannes Kepler University, Altenberger Strasse 69, A-4040 Linz, Austria
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M. Paajanen;
M. Paajanen
VTT Processes, P.O. Box 1607, FIN-33101 Tampere, Finland
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H. Minkkinen;
H. Minkkinen
VTT Processes, P.O. Box 1607, FIN-33101 Tampere, Finland
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J. Raukola
J. Raukola
VTT Processes, P.O. Box 1607, FIN-33101 Tampere, Finland
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Appl. Phys. Lett. 84, 392–394 (2004)
Article history
Received:
July 07 2003
Accepted:
November 20 2003
Citation
M. Wegener, W. Wirges, R. Gerhard-Multhaupt, M. Dansachmüller, R. Schwödiauer, S. Bauer-Gogonea, S. Bauer, M. Paajanen, H. Minkkinen, J. Raukola; Controlled inflation of voids in cellular polymer ferroelectrets: Optimizing electromechanical transducer properties. Appl. Phys. Lett. 19 January 2004; 84 (3): 392–394. https://doi.org/10.1063/1.1641171
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