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Cross-linked polypropylene (XPP) foams are modified by a hot-stretching process and charged to be piezoelectric. The results show that a piezoelectric d 33 -coefficient of 308pC/N is obtained for sample with an elongation ratio of 200%. The dynamic d 33 value is smaller than the quasi-static value, which is probably due to the rise of Young’s modulus with increasing frequency. All...
Polytetrafluoroethylene (PTFE) films with a void structure are prepared by the sintering process. Such void PTFE films are piezoelectric after proper corona charging. The quasi-static piezoelectric d33 coefficients up to 250 pC/N are obtained. Pre-ageing treatment is an effective method to further improve the thermal stability. For the samples with pre-ageing treatment, the the d33 coefficients are...
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