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Interfacial relaxation phenomena in particulate composites of epoxy resin with copper or iron particles

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National Technical University of Athens   

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Interfacial relaxation phenomena in particulate composites of epoxy resin with copper or iron particles (EN)
Kouloumbi, N (EN)
Kyvelidis, S (EN)
Tsangaris, GM (EN)
journalArticle (EN)
2014-03-01T01:12:01Z
1996 (EN)
Interfacial dielectric relaxations have been studied in composites made with epoxy resin and copper or iron particles. Over the temperature range reported (20-160 degrees C) relaxation peaks are formed in the 10-10(3) Hz frequency range. They are attributed to the Maxwell-Wagner-Sillars (MWS), or interfacial, polarization effect, created in heterogeneous dielectrics. The observed MWS loss peaks shift to lower frequencies if the content of the composites in the metal particles is increased. From the temperature dependence of relaxation frequency, the activation energy for the process is estimated to be 45 kJ mol(-1) (0.4 eV). Dielectric losses of the composites in the 10-10(3) Hz frequency range can be regarded as the sum of losses from a Debye-type relaxation and of the conductivity term sigma/omega. Interfacial dielectric losses are insignificant at high frequencies. (EN)
Materials Science, Multidisciplinary (EN)
Polarization (EN)
Composites (EN)
Relaxation frequency (EN)
Dielectric materials (EN)
Iron (EN)
Dielectrics (EN)
Frequencies (EN)
Electric losses (EN)
Metal fillers (EN)
Dielectric relaxation (EN)
Interfacial phenomena (EN)
Relaxation (EN)
Debye type relaxation (EN)
Composite materials (EN)
Epoxy resins (EN)
Interfaces (materials) (EN)
Thermal effects (EN)
Powder metals (EN)
Maxwell-Wagner-Sillars polarization (EN)
Copper (EN)
Activation energy (EN)
Materials Chemistry and Physics (EN)
English
ELSEVIER SCIENCE SA LAUSANNE (EN)
National Technical University of Athens
Digital Library of National Technical University of Athens | Dspace@NTUA
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