Effect of Temperature on the Steady State Creep of Styrene Butadiene Rubber Loaded with Haf Carbon Black

Abstract

The isothermal creep of the HAF/SBR composite with carbon black concentrations 25, 50, 75 and 100 phr was carried out under different stresses ranging from 2.2 to 6.8 MPa and at different working temperatures ranging from 303 to 363 K. The steady state creep strain rate, the stress exponent m and the activation volume q have been found to decrease with increasing the concentrations of carbon black. These observations might be due to the fact that the increase in carbon black concentration raises the stiffness of the test samples by increasing the obstacles where the rigid carbon black spheres act as barriers for the motion of the molecular chain segments. The activation energy of the steady state creep has been found to increase with increasing the carbon black concentration.