Electrical and thermal conductivity of ethylene vinyl acetate composite with graphene and carbon black filler

Ethylene vinyl acetate (EVA) composites, including two different carbonaceous conductive fillers, carbon black (CB) and commercially available graphene (G), were fabricated by solvent-casting and melt compounding methods. The effect of additives and process conditions on electrical and thermal prope...

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Bibliographic Details
Published in:Polymer testing 2018-12, Vol.72, p.24-31
Main Authors: Azizi, Sohrab, David, Eric, Fréchette, Michel F., Nguyen-Tri, Phuong, Ouellet-Plamondon, Claudiane M.
Format: Article
Language:English
Subjects:
Additives
Cables
Carbon black
Composite materials
Dielectric properties
Electric properties
Electrical properties
Electrical resistivity
Ethylene
Ethylene vinyl acetate
Ethylene vinyl acetates
Fillers
Graphene
Heat conductivity
Heat transfer
High voltages
Percolation
Polymer matrix composites
Pressure casting
Shear stress
Solvents
Thermal conductivity
Thermodynamic properties
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Summary:Ethylene vinyl acetate (EVA) composites, including two different carbonaceous conductive fillers, carbon black (CB) and commercially available graphene (G), were fabricated by solvent-casting and melt compounding methods. The effect of additives and process conditions on electrical and thermal properties of composites was investigated. The dielectric responses of EVA composites were characterized by a percolation threshold of 15 wt % for EVA/G prepared by solvent-casting. However, as the EVA/G15% was also subsequently extruded, the applied shear stress induced by extrusion caused deterioration of the electrical network and reduced the composite's electrical conductivity. A percolating network was found for the EVA composites containing CB at around 5–7 wt % with 10 orders of magnitude increase in electrical conductivity with respect to the neat EVA. The thermal conductivity of EVA/CB7% and EVA/G15% increased 16 and 22% respectively, in comparison to the neat EVA. Both additives increased the electrical and thermal conductivity of composites to be appropriate as jackets for high-voltage cables. •Electrical and thermal conductivity of EVA composites with two conductive additives were investigated.•A percolation threshold was characterized by broadband spectroscopy for EVA/G at 15% filler content.•EVA composites with CB filler was found to be conductive at 7 wt% CB filler content.•Addition of graphene and carbon black enhanced the thermal conductivity and dynamic mechanical properties of the composite.
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2018.09.031