Similarities in Stress-Strain-Curve and electrical Conductivity – mechanical Deformation Dependence for Elastomers and Thermoplastics

TESTING AND MEASURING Similarities in Stress-Strain-Curve and electrical Conductivity – mechanical Deformation Dependence for Elastomers and Thermoplastics

01.03.2023 Von Ivan Chodak, Hamed Peidayesh, Bratislava, Slovakia 1 min Lesedauer

Electroconductive composites were prepared using either styrene–butadiene rubber or polycaprolactone matrix with varying amounts of two grades of electroconductive carbon black. Electrical conductivity was measured during deformation and at the same time a stress-strain-curve was recorded. The dependences of electrical conductivity on deformation exhibit several extremes.

Dependence of conductivity on the conductive filler content with schematic pictures of conductive filler particles ordering. A – low electrical conductivity, B – beginning of the percolation threshold region, C – high electrical conductivity.(Bild:) — Dependence of conductivity on the conductive filler content with schematic pictures of conductive filler particles ordering. A – low electrical conductivity, B – beginning of the percolation threshold region, C – high electrical conductivity.
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Electrically conductive polymeric composites are usually prepared by mixing of an insulating polymeric matrix with appropriate type and amount of conductive filler. Fillers can be present as various forms of particles, flakes or fibers. The group of common conductive additives includes conductive carbon black, but other conductive fillers are also frequently used, such as modified carbon black, graphite and graphite fibers, metal particles, metal powders conducting polymers and recently carbon nanotubes.