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The case involving Low-density Polyethylene (LDPE) containing nano-MgO is revisited here with the main aim of verifying the effect of the fabrication technique. LDPE powder and MgO unfunctionalized nanoparticles were used in conjunction with an impact ball-milling method. Samples consisting of neat LDPE and nanocomposites containing 1 and 5 wt% of MgO were prepared. Several material and dielectric...
Low-density polyethylene (LDPE) nanocomposites containing oibPOSS were prepared using ball-milling as a fabrication technique. POSS is basically molecular SiO2. Here it was used up to 5 wt%. At low content, it was found to disperse well into the matrix yet, as the content increases, it was observed to form polycrystals. In general, neat LDPE properties benefit from the presence of the nanofiller....
Low-density Polyethylene (LDPE) was modified by using simultaneously 2 additives. Each additive had a specific attribute. Silicon was used. Using TEM with EELS, it was proved first that the passivated version constituted a double core consisting of Si surrounded by a nanometric layer of amorphous Silica (SiO2). Thus Si brought the possibility of an enlarged dielectric storage capacity with a barrier...
Dielectric properties of epoxy composites containing both molecular and nanoparticulate silica were studied. The comparative dielectric study consisted in comparing neat epoxy and composites containing 1 wt% of nanosilica and both 1 wt% of nanosilica and G-POSS. After establishing the respective expected behavior of the basic composites, experiments have shown that the performance of the composite...
In this paper, the effect of nature and preparation method of two different functionalized graphenes on the dielectric properties of Low Density Polyethylene (LDPE)/Graphene composites was investigated. The first type of composites contains only a single additive, a multilayer graphene purchased from an industrial supplier. The second type of composites was multiphase composites, where another type...
Artificial defects were introduced inside the insulation of the end turns of a medium-voltage motor. Low-frequency dielectric analysis was conducted at 30 °C in the range 10–10 Hz. The missing electrode which is required for the measure was provided by immersion of the end turns in water during the 10-min testing. The seven end turns that were considered had each a specific defect. Dielectric...
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