Porous polytetrafluoroethylene (PTFE) single-film space-charge electrets with high piezoelectric coefficients

• DOI: 10.1049/cp:20000537
• Publication Date: 2005-11-14T15:45:46Z
• Authors: T. Weinhold
• Keywords: Electret; Polytetrafluoroethylene

Porous PTFE films were corona charged with high voltages at room and elevated temperatures their direct inverse piezoelectric coefficients determined. In both cases, d/sub 33/ of up to 600 pC/N found. These values are more than one order magnitude higher those conventional polymers such as poly(vinylidene fluoride). They comparable the inorganic piezoelectrics recently developed porous polypropylene electrets, but have added advantage a much better thermal stability.