The variations of isothermal creep characteristics of styrene butadiene rubber with different percentage of haf carbon black

Abstract EN

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, the activation volume q has 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 concentrations raises the stiffness of the test simply by increasing the obstacles where the rigid carbon black spheres 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.