Title :
Thermal instability of electroactive polypropylene films
Author :
Fernández, O. ; Taylor, D.M.
Author_Institution :
Sch. of Informatics, Univ. of Wales, Bangor, UK
Abstract :
The effect of temperature on corona poled electromechanical films (EMFi) of cellular polypropylene (PP) is investigated. In particular, short-circuit thermally-stimulated-currents (TSC) are reported together with length and thickness mode resonance parameters in the free resonator mode. Variations in sample thickness with temperature were measured using thermomechanical analysis. From the data collected, we conclude that at elevated temperature modification of the cellular structure of the material occurs in addition to charge detrapping. However, the former has the greater effect on the piezoelectric nature of the material.
Keywords :
corona; dielectric resonance; electrets; piezoelectric thin films; polymer films; thermal stability; thermally stimulated currents; EMFi; cellular electret films; cellular polypropylene; charge detrapping; corona poled electromechanical films; corona poling; electroactive polypropylene films; free resonator mode; high temperature cellular structure modification; length mode resonance; piezoelectric material; polypropylene film thermal instability; short-circuit thermally-stimulated-currents; temperature effects; thermomechanical analysis; thickness mode resonance; thickness temperature dependence; Biological materials; Capacitance; Corona; Informatics; Mechanical factors; Piezoelectric films; Piezoelectric materials; Temperature measurement; Thermal stability; Thickness measurement;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2004. CEIDP '04. 2004 Annual Report Conference on
Print_ISBN :
0-7803-8584-5
DOI :
10.1109/CEIDP.2004.1364294
