Degradation of the mechanical properties of composite vulcanizates loaded with paraffin wax

A composite of Styrene Butadiene Rubber SBR) and Natural Rubber (NR) loaded with 40 phr of High Abrasion Furnace (HAF) carbon black is loaded with dif ferent concentrations of paraffin wax. From the stress-strain curves, Young 's modulus was found to decrease with increasing the amount of added paraff in wax. The modified Mooney-Revlin equation was used to calculate the param eters C-1 and C-2. A plot between the true tensile stress as a function of (lambda (2) - lambda (1))was used to calculate two parameters sigma (0) and G, and then both the average molecular weight between crosslinks and the n umber of effective plastic chains per unit volume were also calculated. (C) 2001 John Wiley & Sons, Inc.