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Title: Polarization of thick polyvinylidene fluoride/trifluoroethylene copolymer films
Authors: Chan, HLW 
Zhao, Z
Kwok, KW 
Choy, CL
Alquié, C
Boué, C
Lewiner, J
Keywords: Copolymers
Piezoelectric materials
Heat treatments
Frequency dependence
Issue Date: 1-Oct-1996
Publisher: American Institute of Physics
Source: Journal of applied physics, 1 Oct. 1996, v. 80, no. 7, p. 3982-3991 How to cite?
Journal: Journal of applied physics 
Abstract: Thick (800 µm) polyvinylidene fluoride/trifluoroethylene (P(VDF-TrFE)) copolymer films for transducer applications are poled under applied voltage at elevated temperatures. By using different heat treatments, poling temperatures, and poling time, we are able to prepare a uniformly poled film with a single resonance peak at 1.3 MHz, or a nonuniformly poled film with two resonances (1.3 and 2.6 MHz), or a film with bimorph structure with a single resonance at 2.6 MHz. The nonuniform polarization which arises from charge injection from the cathode is checked by the pressure wave propagation method. The polarization mechanisms in these thick films are expected to be similar to those previously reported for thin films. The results obtained in this work may lead to practical applications because they suggest a means for controlling transducer frequency by poling.
ISSN: 0021-8979
Rights: © 1996 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in H.L.W. Chan et al., J. Appl. Phys. 80, 3982 (1996) and may be found at
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