Piezo- and pyroelectricity of a polymer-foam space-charge electret

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Abstract
Charged closed-cell polypropylene polymerfoams are highly sensitive and broadband piezoelectric materials with a quasistatic piezoelectric d 33 coefficient about 250 pC/N and a dynamic d 33 coefficient of 140 pC/N at 600 kHz. The piezoelectric coefficient is much larger than that of ferroelectric polymers, like polyvinylidene fluoride, and compares favorably with ferroelectric ceramics, such as lead zirconate titanate. The pyroelectric coefficient p 3 =0.25 μ C/m 2 K is small in comparison to ferroelectric polymers and ferroelectric ceramics. The low density, small pyroelectric coefficient and high piezoelectric sensitivity make charged polymerfoams attractive for a wide range of sensor and transducer applications in acoustics, air-borne ultrasound,medicaldiagnostics, and nondestructive testing.

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