Cure modeling and mechanical properties of counter rotating twin screw extruder devulcanized ground rubber tire-natural rubber blends

Ground rubber tire (GRT) powder was devulcanised using a counter-rotating twin-screw extruder and the product was mixed with virgin natural rubber (NR) in various proportions. The data obtained from a cure rheometer was used to fit in a four-parameter logistic model to correlate the variation of torque with time. The mechanical properties were evaluated which suggested that tensile strength and elongation at break increased with increase in virgin natural rubber when added to the extrusion processed GRT.