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

  • 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. (C) 2004 American Institute of Physics

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Author:Michael Wegener, Werner Wirges, Reimund Gerhard-MulthauptORCiDGND, M. Dansachmüller, R. Schwödiauer, Simona Bauer-Gogonea, Siegfried Bauer, Mika Paajanen, Hannu Minkkinen, J. Raukola
Document Type:Article
Year of first Publication:2004
Year of Completion:2004
Release Date:2017/03/25
Source:Applied Physics Letters. - 84 (2004), S. 392 - 394
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert
Institution name at the time of publication:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik