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Effects of temperature on electromechanical properties and ultrasonic performance of piezoelectric cellular PP films

: Sborikas, M.; Ealo, J.L.; Wegener, M.


Sensors and Actuators. A 245 (2016), pp.1-9
ISSN: 0924-4247
Journal Article
Fraunhofer IAP ()

Ferroelectrets are a recent addition to the family of piezoelectric polymers. Ferroelectrets are space-charge electrets with a heterogeneous and usually cellular foam structure. They are flexible, available in large areas and show strong piezoelectric response. Due to their low acoustic impedance they have strong application potential in air-borne ultrasonic transducers. Here, the influence of temperature on the electromechanical and ultrasonic properties of polypropylene (PP) ferroelectrets was addressed. PP ferroelectrets were subjected to repeated temperature variations. The characterization was performed by means of dielectric resonance spectroscopy (DRS) and Laser-Doppler Vibrometry (LDV). Profound variations in the piezoelectric properties during thermal cycling were observed and correlated to the changes in the elastic properties.