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Fullerene is likely to form aggregates so that it is diificult to disperse it well in a polymer matrix, and few reports have been made on electrical insulation properties of fullerene filled composite as electrical insulating material. This paper deals with fullerene dispersion method in conventional epoxy resin (EP) and breakdown strength (BDS) of the composite with different filler loading of fullerene...
Multi-walled carbon nanotube/epoxy resin (MWCNT/EP) composites with filler contents from 0.03wt% to 0.5wt.% and two different aspect ratios are prepared by solution blended process. Carbon nanotubes are dispersed by sonication and high speed shear force. The impact of aspect ratio on electric and thermal conductivity of nanocomposites has been studied. Experiment results illustrate that percolation...
In order to study the effects of grafting modification on the dispersion and dielectric properties of SiO2/epoxy nanocomposites, in toluene solvent, epoxy molecules were grafted to the silane coupling agent (KH550) which were pre-grafted on the surface of nano-SiO2 fillers previously. Original SiO2 fillers and epoxy-grafted SiO2 fillers were used for preparing two kinds of SiO2/epoxy nanocomposites...
In order to get polymeric materials with tunable dielectric permittivity, epoxy composites filled with the combination of micro-size alumina and barium titanate particles were prepared. In this paper, firstly appropriate surface modification method for the inorganic fillers employing silane coupling agent (KH550) was experimentally selected. Then, epoxy resin based composites were prepared with BaTiO...
Knowledge has been pushed further regarding an epoxy composite containing Graphene-Oxide (GO) doped epoxy powder. It was put forward that GO could behave as a curing agent. This would explain the breakdown characteristics of the composites. In spite of being a nanostructured microcomposite, the samples breakdown can be favourably compared to that of neat epoxy. The presence of GO opens the door to...
In this paper, the effect of preparation method on the permittivity and dielectric loss of nano-SiO2/epoxy composites was studied. The nano-SiO2 was dispersed into epoxy resin by three methods, which were “Ultrasonic Dispersion Method”, “High-speed Mixer Method” and “Sol-gel method”. The composites with 1wt%, 2wt%, 3wt% and 4wt% loading were made respectively. To compare the influence of the preparation...
The effect of nano-fillers on dielectric properties of Epoxy has been studied for years. However, with the same nano-particles component, there are some conflicting reports regarding the effect of nano-particles on the dielectric properties of composites. The different processing will result in different dispersion of nano-particles and different dielectric properties of composites as a result of...
Electrical degradation processes in epoxy resins, such as electrical treeing, were found to be dependent on the temperature at which the experiments were carried out. Therefore, it is of considerable research interest to study the influence of temperature on the dielectric properties of the polymers and to relate the effect of temperature on these properties to the possible electrical degradation...
In this paper, we investigate the influence of nanofiller material and its concentration on dielectric properties of epoxy-based composite systems. A comparative study is performed between the unfilled base epoxy, the systems containing one type of nanoparticles (silicon dioxide, aluminum oxide or aluminum nitride) and composites containing a combination of two different fillers inside the host polymer.
Insulation based on epoxy resin is widely used in high voltage applications. This paper shows the formulation of epoxy based nanocomposites and the influence of the filler material on the DC breakdown strength. Filler materials discussed are SiO2, Al2O3 and AlN with average particle size between 22 and 100 nm. AlN has been chosen because it has shown to considerably increase the thermal conductivity...
For the application of nanocomposite materials to solid insulator in electric power apparatus, we investigated the influence of the dispersibility of nanoparticles on dielectric property. Experiments were carried out in epoxy/alumina nanocomposites with the particle dispersion techniques using ultrasonic wave and centrifugal force. As the result, we verified the specific characteristics of dielectric...
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