Abstract
Graphitic layers are designed as a self-assembly structure using edge-carboxylated layers approach. The functionalization facilitate the interfacial interaction between polymer and carbon layers enhancing electrical and mechanical performance.
Highlights
The use of graphite and/or exfoliated graphite (EG) has been extensively explored in order to produce conductive thermoplastic and/or thermosetting polymers with enhanced chemical and physical properties,[1,2,3,4,5,6,7] but a clear understanding concerning the optimal transfer of the ller properties to the polymer composite has not yet been achieved
The work here described demonstrates that full exfoliation of graphite may not be the approach to pursue to achieve very low percolation thresholds and high electrical conductivity especially for bulk polymers
Electrical conductivity of 1.1 S mÀ1 was found for ECG pellets alone, whereas we have found similar values for nanocomposites with very low ller concentrations
Summary
The use of graphite and/or exfoliated graphite (EG) has been extensively explored in order to produce conductive thermoplastic and/or thermosetting polymers with enhanced chemical and physical properties,[1,2,3,4,5,6,7] but a clear understanding concerning the optimal transfer of the ller properties to the polymer composite has not yet been achieved. A deep balance and control of the inherent complexity of these systems at nanoscale level may drive the changes in the nanocomposite properties towards the set goals In light of these considerations, samples of partially exfoliated graphite have been considered both to avoid the negative effect of single graphene layers and to maximize the bene cial effects of graphene-based materials for bulk samples. The results here discussed seem to indicate that polymer (epoxy-based) composites with a very small percentage (starting from 0.1%) of graphitic materials, exhibiting a large fraction (nearly 40%) of highly ordered hexagonal graphite, can reach percolation thresholds and electrical conductivities similar and even better than those obtained for graphene-based nanocomposites. The chemistry of graphene edges strongly affects the physical properties of the resin where these nanoparticles are embedded and drive the changes in the nanocomposite properties towards the desired goals
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