Effect of carbon black on electrical and rheological properties of graphite nanoplatelets/poly(ethylene-butyl acrylate) composites

Abstract

Abstract. The effect of adding carbon black on the electrical and rheological properties of graphite nanoplatelets/poly(ethylene-butyl acrylate) copolymer composites produced via melt or solution mixing was studied. By adding a small amount of low-or high-structured carbon black to the nanocomposite, the electrical percolation threshold decreased and the final conductivity (at higher filler contents) increased. The effect on the percolation threshold was significantly stronger in case of the high-structured carbon black where replacing 10 wt% of the total filler content with carbon black instead of graphite nanoplatelets reduced the electrical percolation threshold from 6.9 to 4.6 vol%. Finally, the solution mixing process was found to be more efficient leading to a lower percolation threshold. For the composites containing high-structured carbon black, graphite nanoplatelets and their hybrids there was a quite reasonable correlation between the electrical and rheological percolation thresholds.

Surface treatment of cellulose nanocrystals (CNC): effects on dispersion rheology

“…It is known the that formation of a gel (or a percolating network) has a strong influence on the rheological properties of the system (Kim and Macosko 2009;Kotsilkova 2007;Oxfall et al 2015). The percolation threshold (u c ) can be estimated using different approaches.…”

The effect of graphite and carbon black ratios on conductive ink performance

“…The screen printing process has the ability to deposit thick layers of viscous slurries be they conductive metals or carbons, or indeed insulators and dielectrics, with high functional material loadings, and hence performance for the various applications. Carbon inks for screen printing are a commercially established technology, particularly in applications such as blood glucose sensors and while there is some literature on the influence of conductive carbon ratios in paints and composites [9,13,14], there is a lack of published literature into the interaction between graphite and carbon black and the effect of the ratios of these ingredients in inks. An abundance of composites studies uses the classical percolation theory to model electrical properties alongside experimental testing, but these only consider single types of carbon in any system [15,16].…”

“…Within a polymeric bonder, the complimentary interaction between these two types of carbon gives rise to a conductive matrix which is substantially more conductive than if these materials are used in isolation. The small carbon black particles readily disperse and form conducting bridges between the graphite rich areas of the composite matrix [9]. Carbon nanotubes have been studied extensively of late as alternative filler materials [10], but they are limited by their very high cost and tendency to agglomerate, making them difficult to process for volume applications [11].…”

Peculiarities of near-electrode relaxation processes in the polyethylene melt filled with graphite and carbon black

“…By using the oscilloscope method within the frequency range 10 to 10 6 Hz at the temperature 492.1 K and pressure 11.31 MPa at the output of the single-screw extruder, dielectric properties of the composite consisting of linear low-density polyethylene, 20 wt.% of graphite and 10 wt.% of carbon black have been investigated. It has been shown that in the whole frequency range, dispersion of R and C on the frequency is observed.…”

“…Therefore, to expand their functionality, studies are performed using different types of polymers and fillers [1][2][3][4][5][6][7][8]. In recent years for such studies, the use of nanoparticles is typical [9][10].…”