TY - GEN
T1 - Evaluation of dielectric properties in polypropylene/clay nanocomposites
AU - Fuse, N.
AU - Tanaka, T.
AU - Ohki, Y.
PY - 2009/12/1
Y1 - 2009/12/1
N2 - Effects of nanofiller addition on four typical dielectric properties, namely permittivity εr′, dielectric loss factor εr″, space charge accumulation, and partial discharge (PD) resistance were evaluated for polypropylene (PP) and its nanocomposites (NCs) with nanoclay. While εr′ and εr″ are almost independent of temperature and frequency in the base unfilled PP, they are highly dependent on the two parameters in the two NCs. Namely, εr′ increases significantly at temperatures above 20°C and the frequency spectrum of εr″; shows at least one temperature-dependent peak. Furthermore, space charge appears abundantly in the two NCs compared to the base PP. These results indicate that plenty of mobile carriers and/or dipoles, probably resulted from the manufacturing process, remain in the two NCs. Notwithstanding the above-mentioned 'inferior' insulating properties, the two NCs have an improved PD resistance compared with the base PP. Namely, the erosion depth on the surface induced by PDs is the smallest in the NC with the largest filler content, while it is the largest in the base PP. Such differences in the effects of nanofillers on different insulating properties are attributable to the fact that nanofillers can improve the PD resistance simply by their presence, while the chemicals needed for uniform dispersion of nanofillers may sometimes increase the permittivity and abundance of charge carriers.
AB - Effects of nanofiller addition on four typical dielectric properties, namely permittivity εr′, dielectric loss factor εr″, space charge accumulation, and partial discharge (PD) resistance were evaluated for polypropylene (PP) and its nanocomposites (NCs) with nanoclay. While εr′ and εr″ are almost independent of temperature and frequency in the base unfilled PP, they are highly dependent on the two parameters in the two NCs. Namely, εr′ increases significantly at temperatures above 20°C and the frequency spectrum of εr″; shows at least one temperature-dependent peak. Furthermore, space charge appears abundantly in the two NCs compared to the base PP. These results indicate that plenty of mobile carriers and/or dipoles, probably resulted from the manufacturing process, remain in the two NCs. Notwithstanding the above-mentioned 'inferior' insulating properties, the two NCs have an improved PD resistance compared with the base PP. Namely, the erosion depth on the surface induced by PDs is the smallest in the NC with the largest filler content, while it is the largest in the base PP. Such differences in the effects of nanofillers on different insulating properties are attributable to the fact that nanofillers can improve the PD resistance simply by their presence, while the chemicals needed for uniform dispersion of nanofillers may sometimes increase the permittivity and abundance of charge carriers.
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U2 - 10.1109/CEIDP.2009.5377891
DO - 10.1109/CEIDP.2009.5377891
M3 - Conference contribution
AN - SCOPUS:77949299150
SN - 9781424445592
T3 - Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
SP - 507
EP - 510
BT - CEIDP - 2009 Annual Report Conference on Electrical Insulation and Dielectric Phenomena
T2 - 2009 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
Y2 - 18 October 2009 through 21 October 2009
ER -