Electrical and Thermal Conductivity of Epoxy-Carbon Filler Composites Processed by Calendaring

Abstract

Electrical and thermal conductivity of composites which contain carbon-based fillers in an epoxy matrix were investigated. The fillers were dispersed in the liquid matrix by using three roll mill equipment. The filler/matrix mixture was cast in a mold and then cured, thus obtaining composite specimens. Multiwall carbon nanotubes, graphene-like nanoplatelets, and graphite were used as fillers and their effect on conductivity was investigated. Electrical and thermal conductivity were measured at different filler loads. It was found that the formation of percolation paths greatly enhanced electrical conductivity, although they were not so effective in improving thermal conductivity. The behavior of composites containing each single filler was compared with that of hybrid composites containing combinations of two different fillers. Results show that fillers with different aspect ratios displayed a synergetic effect resulting in a noticeable improvement of electrical conductivity. However, only a small effect on thermal conductivity was observed.

Novel Carbyne Filled Carbon Nanotube – Polymer Nanocomposites

“…Induced shearing via the calandering method is also responsible for aligning CNTs as previously reported [4,40,[44][45][46]. When the fillers align in one direction, a continuous network of conductive element is formed as confirmed in number of previous studies [40,44,46]. An increase in the order of magnitude (i.e.…”

Self-healing microcapsules encapsulated with carbon nanotubes for improved thermal and electrical properties

“…It was reported that both electrical conductivity and tensile strength were signicantly higher for samples with MWCNT of higher aspect ratio (length/ diameter). Caradonna et al, 16 have dispersed MWCNT and graphene platelets of different aspect ratios into the epoxy matrix by calendaring technique and made nano-composites. Results have shown improvement in the electrical and thermal conductivity of the samples.…”

Specific Heat and Thermal Expansion Coefficient of Hybrid Epoxy Composites

“…), ceramic (alumina [8,9], silicon carbide [10,11], boron nitride [9,12], halloysite nanotubes [13] etc.) or carbonaceous (single- [14] or multi-walled [15][16][17] carbon nanotubes [18], graphene [6,15,16,[18][19][20], carbon black [18,21,22], graphite [11,15,18]) fillers.…”