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In this work thermoplastic polymeric blends based on Low Density Polyethylene (LDPE) and Ethylene Vinyl Acetate (EVA) have been studied. The blends have been prepared by twin screw compounding. In order to obtain different nanocomposite materials, montmorillonite and silica fillers have been considered. These two fillers are characterised by different aspect ratios: the first having a lamellar structure...
The insulation of power supply cables is increasingly performed by non-polar polymers. These materials, mainly polyolefins, combine low density and low cost of production. Among them, cross-linked polyethylene (XLPE) is up to date the best choice for an effective high voltage insulation. The aim of this work is to investigate the possibility to find out a new materials for electrical insulations that...
In this work thermoplastic polymeric blends based on low density polyethylene (LDPE) and ethylene vinyl acetate (EVA) have been investigated. The blends have been obtained mixing together portions of 80% of LDPE and 20% of EVA adding montmorillonite and silica as fillers to get different nanocomposite materials with different nanofillers amounts: chosen percentage were 3% and 7% by weight. The aim...
In this work thermoplastic polymeric blends have been investigated. Such blends are based on low density polyethylene mixed in 80∶20 (wt. %/wt. %) ratio with ethylene vinyl acetate. The nanocomposites has been obtained by adding montmorillonite and silica as fillers. The aim is to identify a new class of insulating materials for medium voltage equipment that could substitute the conventional ones...
Nowadays a lot of high voltage components are insulated by sulfur hexafluoride gas. This gas is unfortunately one of the main responsibles for the progressive increase of the global temperature: for this reason the sulfur hexafluoride gas should be substituted involving the need to find different gases or gas mixtures more environment-friendly. Furthermore it is well known that sulfur hexafluoride...
Stator motor windings of low voltage rotating electrical machines are usually insulated by organic enamel. If during the normal operation partial discharges incept, degradation phenomena and in particular erosion, due to partial discharges, could take place leading the insulating system to breakdown conditions. In this research activity, conventional and nanocomposite enamels have been analyzed: suitable...
Electrical machines and in particular electrical motors used in industry applications are usually coupled with inverter drives in order to better control both the motor torque and speed. Due to the presence of these inverter drives, the stator motor windings are subjected to severe voltage waveforms. When the electrical motors having stator windings insulated by means of type I random wire wound are...
Microcomposites are a well known class of materials. The enhancement of polymer matrix properties can be explained by the classical mixing law. But if the inclusion size is decreased to reach the nanometric range, the improvement of properties is no more due to mixing effect but to the influence of interface of nanoparticles on the matrix. A new emerging class of materials is composites reinforced...
The thermo-mechanical and the electrical characterization of some nanocomposites prepared from bisphenolic epoxy resins and different nanoclays are presented. The study of the nanocomposites morphology revealed a good dispersion of the nanoclay in the epoxy polymer. The dynamic modulus was found to be higher for the nanocomposites irrespective of the nature of the adopted clay. The space charge accumulation...
In this paper, the effect of the water absorbed by inorganic nanofillers (e.g. during the manufacturing process prior to the extrusion) on the electrical properties of a thermoplastic polymer based nanocomposite is studied. Particularly, it is shown how the absorption of water by the nanofiller can affect significantly the nanocomposite electrical properties. Two nanofillers, i.e. fluorohectorite...
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