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Dielectric characteristics of LDPE filled with micro- and nano-sized particles of SiO2 were studied in this paper. The dependence of the loss factor and dielectric constant of composites on frequency was investigated in a relatively wide frequency range, and the roles of the size and loading level of the filler are discussed. Compared with additive-free LDPE, incorporating nano-sized SiO2 can effectively...
Composite samples of low-density polyethylene (LDPE)/ nano-SiO2 and LDPE/ micro-SiO2 were prepared with a method of double-solution mixture, respectively. Depolarization currents of all samples were investigated with thermally-stimulated current. It is found that the currents of both composites increase with the loading level of nano-SiO2 and/or micro-SiO2, and the peak width of each composite is...
Nano-SiO2/ low density polyethylene composite and micro-SiO2/ LDPE composite were prepared via a method of double-solution mixture. The discharging current of all samples after being prestressed at a DC electric field were recorded via Keithley 6517A. Currents of the both composites are less than those of pure LDPE. In addition, the curve shape of the nanocomposite is different from that of pure LDPE...
High field conduction of the composite of nano Ag/low-density polyethylene (LDPE) and pure polyethylene is studied, as well as the effect of the contents of nano Ag on high field conduction. Schottky effect, Poole-Frenkel effect, space-charge-limited conduction (SCLC), and ion hopping conduction are used to fit the results. It is pointed out that both space-charge-limited conduction and Poole-Frenkel...
Nano-SiOx and micro-SiO2 particles were homogeneously dispersed in low-density polyethylene with a method of double-solution mixture. Both kinds of the composites were sputtered with Au and Ag on both surfaces as electrodes, respectively. Space charge in the composites was investigated with pulsed electro-acoustic method (PEA). It is shown that space charge distribution in the sample with different...
Nano-SiOx and micro-SiO2 particles were homogeneously dispersed in low-density polyethylene with double-solution method. The dc breakdown strength of the composite containing various contents of nano-SiOx was experimentally investigated, as well as the composite containing micro-SiO2. The breakdown strength of the nanocomposite is greater than that of pure LDPE. For example, the breakdown strength...
Nano-SiOx or micro-SiO2 can be homogeneously dispersed in polyethylene (LDPE) by a method using a double solution mixture. The dispersion status of nano-SiOx and micro-SiO2 was investigated with scanning electron microscopy (SEM). Polarization and depolarization current of the composite and pure LDPE was recorded with Keithley 6517 A. In order to know the dielectric loss of the composite, polarization...
The composite of nano-SiOx and low-density polyethylene is prepared with the double-solution method. Charging currents of the composite at same dc stress, as well as discharging currents, are recorded with Keithley 6517A. It is found that the curves of charging and discharging currents decrease with charging times. Transferring those charging and discharging currents from time domain into frequency...
The dielectric behavior of a composite system of low-density polyethylene filled with nano-Ag is investigated with time-domain method at the room temperature (293 K). It is shown that the charging vs. time of the composite is lower than that of the pure low-density, however, the depolarization of the composite is faster than that of the pure low-density polyethylene. It seems that nano-Ag/LDPE composite...
The composite of nano-SiOx and low-density polyethylene is prepared with the double-solution method. Space charge distribution in the composite with various nano-SiOx contents is carried out by pulsed electro-acoustic method. It is shown that the amount of space charge in the composite increases with the nano-SiOx content. The space charge in the composite under 50 kV/mm dc stress is mainly hetero,...
The composite of nano-SiOx and low-density polyethylene is prepared with the double-solution method. Charging currents of the composite at different dc stress, as well as discharging currents, are recorded with Keithley 6517A. It is found that the curves of charging and discharging currents increase with electrical field. Transferring those charging and discharging currents from time domain into frequency...
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