Three-layer piezoelectrets from fluorinated ethylene-propylene (FEP) copolymer films |
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Authors: | Peng Fang Feipeng Wang Werner Wirges Reimund Gerhard and Heitor Cury Basso |
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Institution: | (1) Pohl Institute of Solid State Physics, Tongji University, Shanghai, 200092, China |
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Abstract: | A process for preparing three-layer piezoelectrets from fluorinated ethylene-propylene (FEP) copolymer films is introduced.
Samples are made from commercial FEP films by means of laser cutting, laser bonding, electrode evaporation, and high-field
poling. The observed dielectric-resonance spectra demonstrate the piezoelectricity of the FEP sandwiches. Piezoelectric d
33 coefficients up to a few hundred pC/N are achieved. Charging at elevated temperatures can increase the thermal stability
of the piezoelectrets. Isothermal experiments for approximately 15 min demonstrate that samples charged at 140°C keep their
piezoelectric activity up to at least 120°C and retain 70% of their initial d
33 even at 130°C. Acoustical measurements show a relatively flat frequency response in the range between 300 Hz and 20 kHz. |
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