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期刊论文
Influence of porosity on the stability of charge andpiezoelectricity for porous polytetrafluoroethylene film electrets
Journal of Electrostatics 59(2003)57-69,-0001,():
In this paper, the influence of porosity on the stability of charge andpiezoelectric d33 coefficient for porous PTFE electrets is studied by using measurements of isothermal surface potential decay, quasi-static direct piezoelectric coefficient, elastic (compression) modulus and a leakage current through porous andnon-porous PTFE samples during corona charging, analyses of open-circuit thermally stimulated discharge current spectra, X-ray diffraction spectra andd ifferential scanning calorimetry. The results point out that with the increase of porosity, the stability of charge deposited in the film and the piezoelectricity of the film are improvedin a certain range of porosity. The reasons for the influence of porosity on the thermal stability of the charge storage andpiezoelectricity are also investigated. Our results also demonstrate that the improvement of the thermal stability of the piezoelectric coefficient at increasing porosity is due to improvedthermal charge stability andthe improvedstability of the mechanical properties of the material. At the same time, the limitation of the improvement of charge storage and piezoelectricity of a PTFE film with very high porosity is discussed.
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