Piezoelectricity in cellular electret films
Piezoelectricity in cellular electret films
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DOI：
10.1109/94.868074
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发表时间：
2000-08-01
影响因子：
3.1
通讯作者：
Sessler, GM
中科院分区：
文献类型：
--
作者：
Hillenbrand, J;Sessler, GM
带有细胞或多孔结构的永久充电膜代表了新的聚合物elements。这些材料显示了具有高压电常数的压电性能。此类膜的机电响应方程是作为传感器和执行器的运行而得出的。还提出了针对细胞聚丙烯（PP）的实验结果。特别地，讨论了在0至10 kHz的频率范围内的直接和反压电常数的测量以及这些常数在整个膜表面的变化。这些测量值是通过直接施加应力或使用探测仪，加速度计和干涉仪产生的频率无关的压电D（33）常数小于或类似于220 pc/n的。假设合理的电荷分布和电荷密度，计算出的压电常数与测量值非常吻合。理论模型显示了压电常数的互惠。
Permanently charged films with a cellular or porous structure represent a new family of polymer electrets. These materials show piezoelectric properties with high piezoelectric constants. The electromechanical response equations of such films are derived for their operation as sensors and as actuators. Experimental results are also presented for cellular polypropylene (PP). In particular, measurements of the direct and inverse piezoelectric constants in the frequency range 0 to 10 kHz and of the variation of these constants across the surface of the films are discussed. These measurements, performed by direct application of stress or by the use of a profilometer, an accelerometer and an interferometer yield a frequency-independent piezoelectric d(33) constant of less than or similar to 220 pC/N. Assuming reasonable charge distributions and charge densities, the calculated piezoelectric constants are in good agreement with the measured values. The theoretical model shows the reciprocity of the piezoelectric constants.