Prediction of mechanical properties of polymer composites with carbon fillers based on low-frequency electrical conductivity data

Polymers reinforced with carbon fillers are used in load-bearing structures, racing cars, sports equipment, aircraft and drones due to their special stiffness and strength, as well as their electromagnetic shielding or absorption properties. The search for new materials, composites and quick prediction of their properties is an urgent task of polymer materials science. The paper shows that predicting the mechanical strength of the composites is possible by measuring electrical conductivity at low frequencies and extrapolating these values using the obtained expressions. The relative mechanical bending strength has a quadratic dependence on the filler content and can be represented with satisfactory accuracy by the low-frequency electrical conductivity for the composite system.