TY  - JOUR
A1  - Wegener, Michael
A1  - Wirges, Werner
A1  - Gerhard, Reimund
A1  - Dansachmüller, M.
A1  - Schwödiauer, R.
A1  - Bauer-Gogonea, Simona
A1  - Bauer, Siegfried
A1  - Paajanen, Mika
A1  - Minkkinen, Hannu
A1  - Raukola, J.
T1  - Controlled inflation of voids in cellular polymer ferroelectrets : optimizing electromechanical transducer properties
N2  - 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
Y1  - 2004
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/32510
ER  -