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Low weight content of functionalized graphene (G*) and graphene oxide (GO) have been mixed with a matrix of low-density polyethylene (LDPE). The fabrication method consists of two steps: ball-milling and thermal pressing. Broadband Dielectric Spectroscopy (BDS) and Thermal Gravimetric Analysis (TGA) were carried out and the results were compared with the neat LDPE measurements. From the BDS characterization,...
A proper and controlled filler dispersion is the goal of each compound, and nanodielectrics are not an exception for this purpose. A method to avoid agglomeration and ensure a standard particle dimension is presented in this work. Graphene oxide has been dispersed into a thermoplastic polymer starting from standardized building-blocks made of polymeric matrix with a single controlled nano-interface...
Cross-linked polyethylene films have been coated with hybrid organic-inorganic transparent coatings formed through sol-gel reactions and containing small amounts (0.5 wt%) of graphene oxide (GO). Ageing in air at one temperature (120°C) slightly above the on-service one has been carried out in order to test the durability of XLPE substrate. The thermo-oxidative stability of the systems has been investigated...
In this paper the effect on dc and ac electrical properties of silica nano and micro particles dispersed in epoxy resins is discussed. In particular, space charge, conductivity, dielectric strength and partial discharge resistance is analyzed. The results show that nanostructured materials exhibit smaller space charge accumulation with respect to both base and microfilled materials. Regarding PD resistance,...
The aim of this article is to investigate the extent of space charge accumulation due to a temperature gradient in comparison with other charge-supply mechanisms, particularly injection from the electrodes. For this purpose, space-charge measurements were carried out on HVDC cable models under application of different temperature gradients across the cable insulation, above and close to the threshold...
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