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000000217 037__ $$aENY-ARTICLE-2008-168
000000217 041__ $$aeng
000000217 088__ $$aI07/2006/I-018
000000217 100__ $$aMotyl, E$$uWroclaw University of Technology, Poland
000000217 245__ $$aMeasurement of frozen-in polarization in polycarbonate films
000000217 260__ $$c2006-04-06
000000217 300__ $$a6p
000000217 500__ $$aProceedings of the 10th INSUCON International Electrical Insulation Conference. INSUCON 2006. Electrical Insulation Association, Birmingham, UK, 24-26 May 2006. pp. 139-144.
000000217 520__ $$aSpace charge accumulated in dielectric materials affect their properties. The electric strength is determinated by the presence of additional electric field resulting from space charge accumulated near electrodes f11. Space charge phenomena in dielectric materials have been widely discussed recently and there are many experimental techniques for measuring space charge and electric field distribution in solid dielectrics [2-3]. The thermal methods, pressure wave propagation and electroacoustic methods are commonly used for characterization of electrical state of charged materials such as electret, electrical insulation, antistatic materials and functional polymers [4. 5]. The above methods give the same information on the electrical State of material [6]. If is usually the information tin linear combination of real and polarizational charges. Electret properties originate from real surface charges and space charges distributed in the bulk as well as from dipole polarization. The similarity between real charges and ends of dipoles makes it difficult to distinguish between (hem. The problem of discrimination between polarization and real charges was discussed in literature [7, 81. In this work the step electroacoustic method (SEA) was applied for measurement of electrical field distribution along the sample thickness [91, The SEA signals were measured simultaneously during thermally stimulated discharge (TSD) of the sample. The recorded thermogram of current density j tsd gives additional information on discriminating the kind of charges. Simultaneous measurement of TSD and space charge distribution allows to get admiration on local components of the TSD current in a dielectric as it was shown in [10]. In this work simultaneous measurements of electric field using SEA method and TSD currents were used for discriminating between real and frozen-in polarization charges in polycarbonate films after corona charging at higher temperatures.
000000217 6531_ $$apolycarbonate
000000217 6531_ $$apolarization
000000217 700__ $$aKrauze, T$$uWroclaw University of Technology, Poland
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000000217 8564_ $$u$$zAccess to Fulltext
000000217 909CO $$$$pglobal
000000217 980__ $$aARTICLE