Effects of nanofiller loading on the molecular motion and carrier transport in polyamide

Fuse, Norikazu; Sato, Hiroki; Ohki, Yoshimichi; Tanaka, Toshikatsu

doi:10.1109/tdei.2009.4815188

Cited by 63 publications

(36 citation statements)

References 24 publications

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“…The values of G at these aging periods are almost independent on frequency at frequencies lower than 1 kHz. Similar spectra are often observed in dielectric materials that contain a lot of charges such as ions [6]. When charge carriers are transported to form conduction current, G will increase and becomes independent of frequency.…”

Section: B Comparison Of Thz Imaging and Electrochemical Impedance Dsupporting

confidence: 60%

Detection of rust in coated steel plates using terahertz waves

Fuse

Takahashi

Fukuchi

et al. 2011

Proceedings of 2011 International Symposium on Electrical Insulating Materials

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The applicability of terahertz (THz) waves to the detection of rust in coated steel plates has been examined. Spectral intensity measurements of reflected light from a sample coated with epoxy resin show that optical coherence tomography using near-infrared light and THz waves can detect the hidden rest region. This region can be reproduced by so-called THz imaging without contact. Since rust exhibits strong absorption in the frequency range from 1 to 5 THz, the absorption coefficient can be used to estimate the rust state with high sensitivity. In contrast, neither X-ray fluorescence nor Fourier transform infrared spectroscopy can detect the rust, because of the strong X-ray and IR peaks of the coating. Electro-chemical impedance measurement, which is one of the promising diagnostic methods, judges the water blocking ability of the coating. The impedance value and THz absorption due to rust shows good correlation until the amount of water in the film reaches its maximum.

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Section: B Comparison Of Thz Imaging and Electrochemical Impedance Dsupporting

confidence: 60%

Detection of rust in coated steel plates using terahertz waves

Fuse

Takahashi

Fukuchi

et al. 2011

Proceedings of 2011 International Symposium on Electrical Insulating Materials

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“…The movement of charge carriers increases the dielectric loss. This should contribute to the negative frequency dependence of ε r ' and the appearance of at least one ε r " peak in PP-2 and PP-6 [15].…”

Section: Resultsmentioning

confidence: 98%

Comparison of nano-structuration effects in polypropylene among four typical dielectric properties

Fuse

Ohki

Tanaka

2010

IEEE Trans. Dielect. Electr. Insul.

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Effects of nanofiller addition on four typical dielectric properties, namely permittivity ε r ', dielectric loss factor ε r ", space charge accumulation, and partial discharge (PD) resistance were evaluated for polypropylene (PP) and its nanocomposites (NCs) with nanoclay. While ε r ' and ε r " 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, ε r ' increases significantly at temperatures above 20 °C and the frequency spectrum of ε r " 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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“…Namely, if the transport of mobile ions under ac electric field is blocked at the electrode, the total charge on the electrode induced by a fixed applied voltage is increased, resulting in the increase in the real permittivity ε r '. A typical example of this phenomenon is seen in polyamide-6 that exhibits extremely high ε r ' values like 10 6 [9].…”

Section: Electrode Polarizationmentioning

confidence: 94%

Charge transport characteristics in epoxy resin at high temperatures based on electrode polarization analysis

Tian

Ohki

2013

2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Taking epoxy resin as an example, this research demonstrates that characteristic parameters of charge transport and accumulation are obtainable from complex permittivity spectra by carrying out theoretical analysis based on the electrode polarization theory. The real and imaginary permittivity of the electrode polarization satisfy the Cole-Cole relations well at and above 160 °C. The shape parameter of the Cole-Cole arc is found to be an indication of ion blockage at the electrodes. Both the density and mobility of ions are thermally activated and the sum of the activation energies of these two thermal processes is nearly equal to the activation energy of ac conductivity in the same temperature range. This very reasonable result indicates the adequacy of electrode polarization analysis.

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Effects of nanofiller loading on the molecular motion and carrier transport in polyamide

Cited by 63 publications

References 24 publications

Detection of rust in coated steel plates using terahertz waves

Detection of rust in coated steel plates using terahertz waves

Comparison of nano-structuration effects in polypropylene among four typical dielectric properties

Charge transport characteristics in epoxy resin at high temperatures based on electrode polarization analysis

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