Abstract
The effects of palm oil fatty acid and carbon black concentration on dynamic properties, curing characteristics, reversion and fatigue life in natural rubber compounds were studied. The scorch time, t2 and cure time, t90 were found to increase with increasing palm oil fatty acid concentration. For dynamic properties, the maximum elastic torque, increased with increasing acid concentration, whereas the minimum elastic shows a decreasing trend. Results also indicate that the decrease in viscous torque or loss modulus and tan delta is very significant with increasing acid concentration. At similar concentrations of palm oil fatty acid, natural rubber compounds with 50 phr of carbon black show highest maximum and minimum elastic torques, viscous torque and tan delta, followed by compounds with 30 and 15 phr of carbon black. Reversion decreased with increasing palm oil fatty acid concentration, whereas fatigue life shows an increasing trend. At similar acid concentrations, natural rubber compounds with 50 phr of carbon black show the lowest reversion and fatigue life.
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