Comparison of rheological and electrical percolation phenomena in carbon black and carbon nanotube filled epoxy polymers

Thermal, rheological and electrical analysis of MWCNTs/epoxy matrices

“…On the other hand, below this critical particle loading, increasing temperature decreases the zero-shear viscosity as the thermal agitation promotes monomer mobility in an environment where they are free to move (no CNT network obstruction). At last, in this study, a lower percolation onset in suspension could not be observed, as in Sumfleth et al [20], which might be a manifestation of a re-agglomeration process occurring in the uncured suspensions at high CNT contents and temperature. Fig.…”

“…On the other hand, for CNT concentrations higher or equal to 0.50 wt%, g 0 increases while the temperature increases. Earlier works [17][18][19][20][21]23] have reported that the viscoelastic properties observed are strongly dependent on the dispersion state and interactions of the nanofillers inside the polymer matrix. Pötschke et al [17,19] suggested that the rheological behavior can be of use in order to identify the percolation threshold of CNT/polycarbonate composites.…”

“…In this study the percolation threshold was found at 2 wt%. Furthermore, Sumfleth et al [20] also discussed the different percolation phenomena found in the electrical behavior of the cured epoxy/CNT nanocomposites as well as in the rheological properties of the CNT-filled suspensions. This comparison gave a comprehensive insight in the network forming process.…”

Hotmelts with improved properties by integration of carbon nanotubes

“…[30,31] It provides evidence of the percolation threshold. [32,33] The frequency dependence of the storage modulus G´ in log-log plots is shown in Figure 7 [32,34] .…”

Electrically conductive epoxy nanocomposites containing carbonaceous fillers and in-situ generated silver nanoparticles

“…Because of their chemical versatility and the possibility to tailor the glass transition temperature by using different epoxy bases and/or chain extenders, they were often applied in several technological applications [1]. Furthermore, it has been widely proven that the addition of metal and carbon based nanofillers, such as metal nanopowders, graphite nanoplatelets (GnPs), carbon black (CB) and carbon nanofibers (NFs) could dramatically improve the mechanical behavior and the electrical conductivity of the resulting materials [2][3][4]. The electrical behavior of these systems can be successfully explained considering the percolation theory [5].…”