Three-layer piezoelectrets from fluorinated ethylene-propylene (FEP) copolymer films
Source abstract
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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High voltage insulation and dielectric phenomena · Dielectric materials and actuators · Advanced Sensor and Energy Harvesting Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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