Laminated Tubular-channel Ferroelectret Systems from Low-density Polyethylene Films and from Fluoroethylene-propylene Copolymer Films - A Comparison

作者：Altafim Ruy Alberto Pisani^*; Rychkov Dmitry; Wirges Werner; Gerhard Reimund; Basso Heitor Cury; Correa Altafim Ruy Alberto; Melzer Martin

来源：IEEE Transactions on Dielectrics and Electrical Insulation, 2012, 19(4): 1116-1123.

DOI：10.1109/TDEI.2012.6259978

• Ferroelectrets
• piezoelectrets
• piezoelectricity
• electro-mechanical transducers
• static-pressure dependence
• temperature dependence
• frequency response

A template-based lamination technique for the manufacture of ferroelectrets from uniform electret films was recently reported. In the present work, this technique is used to prepare similar ferroelectret structures from low-density polyethylene (LDPE) films and from fluoro-ethylene-propylene (FEP) copolymer films. A comparative analysis of the pressure-, temperature-, and frequency-dependent piezoelectric properties has been performed on the two ferroelectret systems. It is observed that the FEP ferroelectrets exhibit better piezoelectric responses and are thermally more stable. The difference between the piezoelectric d(33) coefficients of the two ferroelectret systems is partially explained here by their different elastic moduli. The anti-resonance peaks of both structures have been investigated by means of dielectric resonance spectroscopy and electroacoustic sound-pressure measurements. A difference of more than 10 kHz is observed between the anti-resonance frequencies of the two ferroelectret systems.

• 出版日期2012-8