Title :
Dielectric and electret properties of novel Teflon PTFE and PTFE-like polymers
Author :
Schwödiauer, R. ; Neugschwandtner, G. ; Bauer-Gogonea, S. ; Bauer, S. ; Heitz, J. ; Bäuerle, D.
Author_Institution :
Dept. of Angewandte Phys., Johannes Kepler Univ., Linz, Austria
Abstract :
Dielectric, elastic and electret properties were investigated on pulsed-laser deposited (PLD) polytetrafluoroethylene (PTFE) on silicon substrates, on microporous PTFE foils and on hybrid electrets consisting of microporous PTFE and perfluorocyclobutene (PFCB). Dielectric dilatometry was used to detect glass- and structural phase-transitions in these nonpolar polymers: PLD-PTFE and microporous PTFE foils show the characteristic first-order phase transitions of PTFE. The fibrillar structure of the microporous PTFE results in large electrostrictive coefficients. Both the PTFE-like materials and the hybrid PTFE-PFCB electrets show excellent charge-storage stability and surpass conventional PTFE in performance. Applications can be anticipated in miniaturized electret devices as well as sensitive electret hydrophones
Keywords :
electrets; electrostriction; glass transition; polymer films; porous materials; pulsed laser deposition; solid-state phase transformations; space charge; PTFE-like polymers; Teflon PTFE; charge-storage stability; dielectric dilatometry; dielectric properties; electret properties; fibrillar structure; hybrid electrets; large electrostrictive coefficients; microporous PTFE foils; miniaturized electret devices; polytetrafluoroethylene; pulsed-laser deposition; sensitive electret hydrophones; structural phase-transitions; Crystallization; Dielectric materials; Dielectric substrates; Electrets; Electrostriction; Polymers; Powders; Silicon; Sonar equipment; Temperature;
Conference_Titel :
Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on
Conference_Location :
Athens
Print_ISBN :
0-7803-5025-1
DOI :
10.1109/ISE.1999.832050
