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Lekkala, J.
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article
Large and broadband piezoelectricity in smart polymer-foam space-charge electrets
Abstract
Charged closed-cell microporous polypropylene foams are shown to exhibit piezoelectric resonance modes in the dielectric function, coupled with a large anisotropy in the electromechanical and elastic material properties. Strong direct and converse dynamic piezoelectricity with a piezoelectric d<SUB>33</SUB> coefficient of 140 pC/N at 600 kHz is identified. The piezoelectric d<SUB>33</SUB> coefficient exceeds that of the ferroelectric polymer polyvinylidene fluoride by a factor of 5 and compares favorably with ferroelectric ceramics. Applications of similar concepts should provide a broad class of easily fabricated "soft" piezoelectric materials....