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

Abstract

This work presents how the optimization of polymer conductive composites constituting the semi-crystalline polymer matrix (low-density polyethylene (LDPE) and isotactic polypropylene (it-PP)) and carbon black (CB) by melt-mixing process, has an important influence not only in diminishing the resistivity of the composite but also in reducing the critical concentration of CB. The experimental procedure consists of studying the influence of processing parameters such as mixing temperature, time, and speed on the electrical resistivity values. Optimal parameters are considered as those obtained with the lowest standard deviation for electrical resistivity and a reduction in resistivity in comparison with the arbitrary conditions established as preliminary or reference. The control of those parameters allows in attaining an important reduction (7%) in the critical CB concentration at threshold percolation in both the studied composites in comparison

Investigation of crack detection properties of elastomer-based nanocomposites under cyclic strain loading with graphene and carbon black interaction filler

“…The resistance increase during return was determined due to the hybrid composite’s low filler content 35,36 (7 phr CB and 1 phr GE termed HNGE01) due to the excess rubber matrix. Even when the strain values for this material (HNGE01) went up to 5%, sometimes remarkably high resistance measurements were taken, and the material showed an insulator character.…”

Role of formulation additives on the properties of thermoplastic polyether ester elastomer-based and carbon fabric-reinforced multilayer composites

“…They reported that it was possible to prepare a conductive material with a lower concentration of conductive particles (the critical concentration was calculated as 13.7 wt.% CB for LDPE and 4.9 wt.% CB for it-PP) by improving the processing conditions for composites. 21 Oil additives have long been utilized as a processing aid in the polymer sector due to their several benefits. They improve the dimensional stability of extruded materials, reduces molding filling time and curing cycle time, improves the ozone resistance of the rubber compound, minimizes plasticizer migration to the surface of rubber component, and have capability to regulate flow under mechanical pressure.…”

“…They reported that it was possible to prepare a conductive material with a lower concentration of conductive particles (the critical concentration was calculated as 13.7 wt.% CB for LDPE and 4.9 wt.% CB for it-PP) by improving the processing conditions for composites. 21…”

Relationship between Polymer Dielectric Constant and Percolation Threshold in Conductive Poly(styrene)‐Type Polymer and Carbon Black Composites

“…Most of the polymer composites are produced in liquid phase, in a melt stage, or in monomer or polymer dissolution. In both cases, a suspension is always formed and it has been studied that the resistivity control for melt polymer composites is also dependent on processing parameters such as mixing time, temperature, rotor speed, molding time, temperature, and pressure at molding [43][44][45][46][47][48][49]. For a composite obtained by in situ method that consists in making first a dispersion of carbon particles into the monomer and then a subsequent polymerization of that suspension, the optimization of the processing parameters is more difficult.…”