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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...
The short-medium term behaviour of pure and nanocomposite polypropylene is investigated: in particular both breakdown voltage tests and electrical aging tests are performed applying sinusoidal waveforms at industrial frequency (50 Hz) to the studied materials. The nanocomposite material is obtained by the dispersion of 10% by wt. of inorganic nanosized clay inside the organic polypropylene (PP) matrix...
This investigation is dedicated to the development of a new class of nanostructured composite material from cycloaliphatic epoxy polymers with nanoclay and microsilica as the fillers and the analysis of the behavior associated in the inclined plane tracking test (IEC 60587). Composite materials with different weight percentages of fillers were prepared and subjected to electrical tracking according...
This work deals with the inception and the growth of electrical treeing inside different Low Density Polyethylene (LDPE) nanocomposites. Two nanoflllers were adopted: sepiolite and montmorillonite. Both nanoflllers belong to the family of silicate clay minerals but have different aspect ratio. The nanocomposites have been prepared by melt dispersion of sepiolite, montmorillonite and a mixture of both...
This work presents the output of a short and medium term electrical characterisation performed on different nanocomposite materials obtained by the dispersion of inorganic nanoparticles into a matrix of Low Density Polyethylene (LDPE). Two nanofillers were adopted: sepiolite and montmorillonite. Both nanofillers belong to the family of silicate clay minerals but have different aspect ratio. The nanocomposites...
An epoxy matrix varnish, used for topping treatment of electrical machines stators, was studied. The experimental nanocomposites were prepared using the same organically modified clay varying the mixing process. The nanostructure of each material was assessed by means of WAXRD. The homogeneity at the micron level was checked via SEM observations of brittle fractured sections. DSC analyses were conducted...
Nanocomposite materials show promising results for applications as electrical insulation. Among several materials presently under investigation, previous works indicate that polypropylene and ethylene-vinilacetate filled by nanosilicates present lower content of space charge and higher electric strength. However, efforts are needed to explain nanocomposite behaviour and characterize their electrical,...
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