Polarization Processes of Nanocomposite Silicate-EVA and PP Materials
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概要
- 論文の詳細を見る
Recent works indicate that polypropylene (PP) and ethylene-vinylacetate (EVA) filled by nanosilicates may present low content of space charge and high electric strength. Investigations are being made to explain nanocomposite behaviour and characterize their electrical, thermal and mechanical properties. In this paper, the results of broad-band dielectric spectroscopy performed on EVA and PP filled by layered nanosized silicates are reported. Isochronal and isothermal curves of complex permittivity, as well as activation energies of the relaxation processes, are presented and discussed. Nanostructuration gives rise to substantial changes in the polarisation and dielectric loss behaviour. While the relaxation process of EVA, associated with glass transition of the material amorphous phase, results unchanged from base to nanostructured material, nanocomposites EVA and PP have shown the rise of a new process at higher temperatures respect to the typical host material processes, as well as a different distribution of relaxation processes. Changes in space charge accumulation in relation to the effectiveness of the purification process performed upon nanostructured materials are also reported: while the dispersion of the clean clays leads to a reduction of the space charge, especially at high fields, an unclean filler gives rise to significant homo-charge accumulation and interfacial polarisation phenomena.
- 社団法人 電気学会の論文
- 2006-11-01
著者
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Testa Luigi
Dieet Dept. Of Electrical Electronics And Telecommunications Engineering Palermo University
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Montanari Gian
Die-limat Dept. Of Electrical Engineering University Of Bologna
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PALMIERI Fabrizio
DIE-LIMAT, Dept. of Electrical Engineering, University of Bologna
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MOTORI Antonio
DICASM, Department of Applied Chemistry and Material Science, University of Bologna
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SACCANI Andrea
DICASM, Department of Applied Chemistry and Material Science, University of Bologna
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PATUELLI Francesca
DICASM, Department of Applied Chemistry and Material Science, University of Bologna
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Palmieri Fabrizio
Die-limat Dept. Of Electrical Engineering University Of Bologna
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Motori Antonio
Dicasm Department Of Applied Chemistry And Material Science University Of Bologna
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Saccani Andrea
Dicasm Department Of Applied Chemistry And Material Science University Of Bologna
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Patuelli Francesca
Dicasm Department Of Applied Chemistry And Material Science University Of Bologna