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SiO2/LDPE nanocomposites can effectively decrease space charge accumulation at room temperature. However, space charge build up and suppress mechanism in nanocomposite are still not well understood. Experiments results showed that LDPE has a TSC peak around 60°C and the mechanical loss curve of LDPE which has a peak corresponding to the α-relaxation correspond well to the TSC peak. Space charge of...
Recent years the application of ultraviolet-irradiation crosslinked polyethylene (UV-irradiation XLPE) cable for low voltage has become increasingly mature, but for high voltage is still in the research stage. The dielectric properties of high voltage UV-irradiation XLPE with new type macromolecule photoinitiator and polyfunctional crosslinker were studied in this paper. The influence of irradiation...
In this paper, the enhanced transmission properties of the periodic rectangular groove based on carbon nanotube film on the dielectric substrate have been investigated. The transmission spectra exhibit well-defined maxima of which the position are determined by the geometry of the hole array. The magnitude of the transmission peak increases from 0.02 to 0.09 for groove width of 15–25 µm, when the...
Electrostatic Force Microscope (EFM) is applied to study of the properties of surface charge of polyimide films in micro-nanometer scale. The charge was injected by different kind of coating tips to the surface of polyimide films. After that the surface charge was characterized by EFM, the result indicated that it was difficult to inject charge with Pt/Ir coating tip for larger work function than...
LDPE/Fe3O4 composite films with Fe3O4 nanoparticle being modified by a surfactant have been successfully prepared using conventional melt-blending technique in a sigma internal mixer. The LDPE/Fe3O4 composite films were characterized with SEM, FTIR.And the dielectrical property of the LDPE/Fe3O4 composite films were measured. FTIR and SEM results showed that the composite films were mainly composed...
Use type 4A nanoscale zeolite powder composite with Low-density polyethylene(LDPE), obtained the different of doping concentration of composite materials which the zeolite weight percentage are from 0.5wt% to 3wt%. By using broadband dielectric spectrometer measure and analyse the dielectric performance in a relatively wide frequency range to LDPE/zeolite composite and pure polyethylene at different...
The multiferroic materials BiFeO3 nanoparticles of dispersion uniformity were synthesized by the citric acid sol-gel method, using the iron(III) nitrate and bismuth nitrate as the reactants and dilute nitric acid as the catalyst. The physical and chemical characteristics, such as structure, morphology and purity of BiFeO3 nanoparticles were investigated by thermogravimetry- differential scanning calorimetry...
The distribution of charge trap in polyethylene was studied by means of photo-stimulated discharge (PSD) and thermally stimulated discharge (TSD). The shallow trap of 0.77eV in the analysis of TSD comes from the same trap distribution as the deep trap of the depth from 4.80 to 5.90eV in PSD. The results showed that the trap itself is suffered from thermal erosion in the process of charge released...
Polyethylene films were studied by photo-stimulated discharge (PSD) and thermally stimulated current (TSC) to understand the detrapped process and the energy spectrum distribution of trap of space charges. The space charge profiles were determined in real time by the pulsed electro-acoustic (PEA) technique. The results showed that the activation energy estimated from the non-isothermal TSC and PSD...
Photo-stimulated discharge (PSD) is an effective method to characterize the deep traps in the dielectric materials. In this paper, a new PSD measuring system was firstly built up based on the optical parametric oscillator laser. The laser can generate continuously tunable wavelength output light of which wavelength range is 210-420 nm and average output pulse energy is 2.3 mJ. The system overcomes...
A new kind of one dimensional (1-D) nano - material was successfully prepared by introducing poly (methyl methacrylate) (PMMA) into a kind of track etch nano-hole polymer films via polymerization. The dielectric characteristics of these nano-materials were investigated by high-voltage device and precision impedance analyzer etc. This kind of 1-D nano - material exhibits a better dielectric strength...
Low-density polyethylene (LDPE)/pumice composites with different pumice weight percentage (1 wt%, 2 wt% and 5 wt%) were prepared by melt blending process in torque rheometer. Space charge distribution in composites and pure LDPE were investigated with pulsed electro-acoustic method (PEA). The results indicate that most of the space charge in pure LDPE under high electrical field was homo-polarity...
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