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Porous polytetrafluoroethylene (PTFE) electret films: porosity and time dependent charging behavior of the free surface

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Abstract

Electrically charged porous polytetrafluoroethylene (PTFE) films are often discussed as active layers for electromechanical transducers. Here, the electric charging behavior of open-porous PTFE films with different porosities is investigated. Optimized electric charging of porous PTFE films is determined by variation of charging parameters such as electric fields and charging times. Maximum surface potentials are depending on the porosity of the PTFE films. Suitable charging leads to high surface potentials observed on non-stretched or slightly stretched porous PTFE films. Further increase of charging fields yields decreasing values of the surface potential accompanied with an increase of conductivity.

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Acknowledgments

The authors are indebted to Prof. Dr. Reimund Gerhard-Multhaupt and Dr. Axel Mellinger (both with University of Potsdam, Germany) for many stimulating discussions in the field of electrets. Partial financial support was received from the European Union (ERDE Projects 80110705 and 80115572), the Volkswagen Foundation (Project: ‘Charge Storage and Piezoelectricity of Porous and Cellular Electret Films’ (I/77 365)) and the German Research Foundation (DFG project GE 945/8-2).

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Correspondence to Michael Wegener.

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Wegener, M., Wirges, W. & Tiersch, B. Porous polytetrafluoroethylene (PTFE) electret films: porosity and time dependent charging behavior of the free surface. J Porous Mater 14, 111–118 (2007). https://doi.org/10.1007/s10934-006-9015-0

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