Title :
Electret properties of cycloolefin copolymers
Author :
Sessler, G.M. ; Yang, G.M. ; Hatke, W.
Author_Institution :
Darmstadt Univ. of Technol., Germany
Abstract :
The electret properties of cycloolefin copolymer (COC) films, metalized on one side and charged with corona or electron-beam methods, were investigated. Measurements of the isothermal decay of surface and bulk charges under room conditions and at elevated temperatures and humidities as well as thermally-stimulated current measurements indicate excellent stability of surface charges of positive and negative polarity. Negative bulk charges, injected be electron beams, are less stable. The COC materials are nonpolar and show no measurable piezo- and pyroelectric activity
Keywords :
electrets; polymer blends; polymer films; surface potential; thermally stimulated currents; COC film; bulk charge; corona charging; cycloolefin copolymer; electret; electron beam charging; elevated temperature; humidity; isothermal potential decay; metalization; surface charge; thermally stimulated current; Amorphous materials; Corona; Current measurement; Electrets; Electric resistance; Electron beams; Glass; Polymers; Surface charging; Temperature;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1997. IEEE 1997 Annual Report., Conference on
Conference_Location :
Minneapolis, MN
Print_ISBN :
0-7803-3851-0
DOI :
10.1109/CEIDP.1997.641113
