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Carbon nanotube (CNT) was modified with TDI molecules in order to improve the dispersion of carbon nanotube fillers in organic phase. Semi-conductive layer prepared by epoxy matrix with 0.045 phr CNT was second-time bonded to the neat epoxy for preparing double-layer composite. Broadband dielectric spectroscopy was performed to measure the complex permittivity of neat epoxy, epoxy — CNT/epoxy double-layer...
In order to study the effect of the glass transition temperature (Tg) on space charge behavior of epoxy resin under polarity reversal voltage, the epoxy resin samples with low Tg were casted in vacuum condition. The dielectric spectra of the samples were measured over the frequency range of 10−1 to 106 Hz at different temperatures. At different temperatures the negative poling field of −30 kV/mm was...
At high temperature and high electric field, the accumulation of space charge would take place in epoxy resin which is used in ultra-high voltage direct current (UHVDC) dry bushings. The space charge accumulated would distort electric field distribution in epoxy resin under polarity reversal voltage. The epoxy resin samples were cast in vacuum condition. At different temperatures, the epoxy resin...
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