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Whether the surface resistance to erosion of a polymer nanocomposite system containing a conductive phase could be affected is the topic of this contribution. In order to answer this question, two material systems were fabricated and studied. Low-density polyethylene (LDPE) was prepared using ball-milling with Graphene Oxide (GO) up to 0.3 wt%. Epoxy resin was mixed with Carbon Black (CB) up to a...
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,...
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...
In this work, nanopowders of graphene oxide (GO) and functionalized graphene (G*) have been mixed with low-density polyethylene (LDPE) to fabricate samples with low filler weight ratio. A peculiar fabrication method was utilized, which consisted of ball-milling followed by thermal pressing. Electrical properties like resistance to erosion due to partial discharge (PD), and breakdown values were detected...
In this report, a multi-layer functionalized graphene was mixed to UHMWPE. Composite samples with 0.05 wt%; 0.1 wt%; 0.15 wt% and 0.5 wt% of functionalized graphene have been manually mixed. The AC conductivity of these samples was then measured using Broadband Dielectric Spectroscopy (BDS) at low voltage. The measurements were conducted at room temperature, 40 °C, 60 °C and 80 °C, respectively. The...
In the recent years, graphene studies have increased rapidly. Graphene oxide (GO), which is an intermediate product to form graphene, is insulating and it should be thermally reduced to be electrically conductive. In this work, we have described an attempt to change the insulating properties of GO by changing their pH. GO powder has been synthesized and modified to maintain pH=3 by wash process. Microstructure...
Epoxy powder (EP) was ball-milled together with Graphene Oxide (GO) to form a new filler to be added to epoxy resin. The idea was that ball-milling would make interact the GO with the powder. The present trials and optical analysis seem to indicate that there is a cause-to-effect relation between the duo EP/GO and its agglomeration. Once the filler added to epoxy resin, the resulting composite was...
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