Three-layer piezoelectrets from fluorinated ethylene-propylene (FEP) copolymer films
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
---|---|
Data(s) |
18/10/2012
18/10/2012
2011
|
Resumo |
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 140A degrees C keep their piezoelectric activity up to at least 120A degrees C and retain 70% of their initial d (33) even at 130A degrees C. Acoustical measurements show a relatively flat frequency response in the range between 300 Hz and 20 kHz. CAPES (Brazil) DAAD (Germany)[D/08/11608] DFG[WA 2688/1-1] EU |
Identificador |
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, v.103, n.2, p.455-461, 2011 0947-8396 http://producao.usp.br/handle/BDPI/17701 10.1007/s00339-010-6008-2 |
Idioma(s) |
eng |
Publicador |
SPRINGER |
Relação |
Applied Physics A-materials Science & Processing |
Direitos |
restrictedAccess Copyright SPRINGER |
Palavras-Chave | #VINYLIDENE FLUORIDE #FERROELECTRETS #TRANSDUCERS #POLYMER #CHARGE #SOFT #Materials Science, Multidisciplinary #Physics, Applied |
Tipo |
article original article publishedVersion |