RETRACTED ARTICLE: Effect of carbon content on the electrical conductivity of carbon black-filled pmc with various matrices

Abstract

The electrical conductivity of carbon black-filled polymer matrix composites (PMC) with various matrices was studied as a function of carbon content to find the break point of the relationship between carbon content and conductivity. Conductivity jumps by as much as ten orders of magnitude at the break point. The critical carbon content corresponding to the break point varies depending on the matrix species and tends to increase with increase in the surface tension of the matrix. To explain the dependency of the critical carbon content on the matrix species, a simple equation was derived under some assumptions, the most important of which is that when the interfacial excess energy introduced by particles of carbon black into the matrix reaches a universal value ( ), the particles of carbon black begin to coagulate so as to avoid any further increase of the energy and to form networks which facilitate electrical conduction. The equation well explains the dependency through surface tension, as long as the difference of the surface tensions between the particles of carbon black and the matrix is not very small.

Change of Percolation Threshold in Carbon Powder-Filled Polystyrene Matrix Composites

“…Although non-ohmic current behaviors for the applied field have been presented on polystyrene films, the ohmic dependence of current on electric field has usually been observed for low applied fields such as shown in this figure. 14,15) In section 2, current is extremely small at low electric field and show a sharp increase with increasing applied field. The ohmic dependence of resistivity on applied field appears again in section 3, and resistivity is less than about 10 5 Ω • cm.…”

“…The feature of the dependence of X 1 and X 2 is similar to that reported for carbon powder-filled polyethylene matrix. 14,15) Namely, higher structure carbon powder shows lower values X 1 and X 2 than lower structure carbon powder. Fig.…”

Experimental study of the processing parameters of polymer conductive semicrystalline polymer composites with carbon black

“…Because the electrical properties of the polymer compounds depend on the distribution and concentration 1 –24 of the conductive particles, polymer composite have some advantages over other useful materials for electric conduction. In terms of concentration of the conductive particles, polymer composites show electrical resistivity from the insulator to the conductive regimen; this means they show resistivity depending on the composition of the conductive particles, with the benefit of being much lighter than the conventional conductive materials.…”

“…As a result, it is important to understand the effect of the processing parameters on the particle distribution for each polymer–particle pair, 1 –31 allowing us to select the conditions for obtaining compounds with reproducible electrical properties and modeling the final properties of the polymer compound.…”

“…Among the most interesting particles are the carbon single-walled 9 and multi-walled nanotubes, 10,11 nanofibers, 12 carbon blacks (CBs), 13 metallic particles, 14 and others. 15 Relevant contributions have been achieved, thanks to the electrical properties studied from the chemical and physical nature of the polymer matrix, 16,17 its dependence on molecular weight, 18 thermal transitions, 19 surface tension, 20 and so on. A central point of study of these materials has been the development of techniques and specialized equipment 21,22 for preparation and processing, allowing for correct conclusions about the electrical behavior of these types of materials.…”