Improved piezoelectric properties of cellular polypropylene ferroelectrets by chemical modification |
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Authors: | Zhenlian An Min Zhao Junlan Yao Yewen Zhang and Zhongfu Xia |
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Institution: | (1) Pohl Institute of Solid State Physics, Tongji University, 1239 Siping Rd., Shanghai, 200092, China |
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Abstract: | To improve the thermal stability of piezoelectricity of polypropylene (PP) ferroelectrets, chemical modification of the cellular
PP film was performed via chromic acid oxidation and then hydrofluoric acid treatment. Deep chemical modification is achieved
as indicated by the energy-dispersive X-ray analyses on the cross-section of the modified cellular PP film. The results of
the isothermal decay for piezoelectric d
33-coefficient at 70°C indicate the improved thermal stability of piezoelectricity and the enhanced piezoelectric activity of
the modified PP ferroelectrets. The former is attributed to the improvement of thermal stability of the charges trapped in
the internal void surface layers as indicated by the thermally stimulated discharge measurements, while the latter results
not only from the improved thermal stability of the charges but also from the reduction in Young’s modulus of the PP ferroelectrets
due to the chemical modification as revealed by the dielectric resonance analyses. |
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Keywords: | PACS" target="_blank">PACS 77 65 -j 61 43 Gt 82 35 -x 73 50 Gr 81 40 -z |
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