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Novel Polymer Electrets

Published online by Cambridge University Press:  10 February 2011

G. M. Sessler  and
J. Hillenbrand
G. M. Sessler
Affiliation:
Institute for Communications Technology, Darmstadt University of Technology, Merckstrasse 25, D-64283 Darmstadt (Germany)
J. Hillenbrand
Affiliation:
Institute for Communications Technology, Darmstadt University of Technology, Merckstrasse 25, D-64283 Darmstadt (Germany)
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Abstract

Permanently charged films with a cellular or porous structure represent a new family of polymer electrets. These materials show piezoelectric properties with high transducer constants. The electromechanical response equations of such films are derived for their operation as sensors and as actuators. Experimental results are also presented for cellular polypropylene. In particular, measurements of the direct and inverse transducer constants, the thermal stability of the charge, and Young's modulus are discussed. Assuming reasonable charge distributions and charge densities, the calculated transducer constants are in good agreement with the measured values. Both the theoretical model and the measurements show the reciprocity of the transducer constants.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 600: Symposium FF – Electroactive Polymers , 1999 , 143
Copyright
Copyright © Materials Research Society 2000

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