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 very stable when exposed to 120°C. The values of d33 are slightly applied pressure dependent in the range of 50kPa.
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机译：通过烧结工艺制备了具有空隙结构的聚四氟乙烯（PTFE）薄膜。在适当的电晕充电后，这种空洞的PTFE膜是压电的。获得了高达250 pC / N的准静态压电d33系数。预时效处理是进一步提高热稳定性的有效方法。对于经过预时效处理的样品，d33系数在暴露于120°C时非常稳定。 d33的值是轻微施加的压力，范围为50kPa。
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