The Effect of Accelerator on the Crosslink Density and Mechanical Behaviour of an SBR-Filled Elastomer

The effect of accelerator to sulfur ratio variation on the crosslink density of an SBR-carbon black filled elastomer has been studied. Moreover, the reinforcement ef fect of the inclusions as well as the type of rubber attachment on the filler surface with varying the accelerator content has also been examined. DSC tests and swelling measure ments have been made for the studying of the chemical crosslinking. Equilibrium stress- strain tests and tensile-retraction measurements have been carried out for the determina tion of the mechanical behaviour of the materials tested. The Mooney-Rivlin relation was used to describe the behaviour of the rubber matrix and values of constants C ₁ , C ₂ have been calculated with the use of the strain amplification factor.