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Piezoelectricity of single- and multi-layer cellular polypropylene film electrets |
| QIU Xunlin, XIA Zhongfu, WANG Feipeng |
| Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, China; |
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Abstract The piezoelectricity of a pressure-treated cellular polypropylene (PP) (commercially available, trade name PQ50) film electret was studied by the measurement of direct- and inverse-piezoelectric d33 coefficient. The sample expanded with optimal parameters has a quasi-static piezoelectric d33 coefficient of more than 600 pC/N, which is about 40 times as high as that of polyvinylidene fluoride (PVDF). In addition, the hybrid multi-layer system, which properly combines single-layer cellular PP film electrets, shows a quasi-static piezoelectric sensitivity of as high as 2010 pC/N. This is around three times higher than that of well-known lead zirconate titanate (PZT) ceramics. The results are theoretically and technically helpful to promote the application of cellular PP film electrets.
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Issue Date: 05 March 2007
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