he Effects of Sulphur/Accelerator Ratio on the Cure Properties and Mechanical Behavior of Various Grades of Styrene-Butadiene-Rubber

In this work, various types of styrene butadiene rubbers (SBR) were cured using different sulfur curing systems; and the vulcanization process and mechanical properties were investigated. All types of SBR, 1500, 1502 and 1712, had almost the same cure time and cure rate. Grade 1712, having aromatic oil, showed the lower cure torque than the others. With increasing accelerator amount, cure torques changed significantly, cure times decreased while cure rate increased. Compounds with more effective curing system had the greater Young’s modulus and lower elongation at break. The hardness increased by increasing in Acc/S ratio, however the fatigue life decreased. SBR 1502 showed the higher muduus and SBR 1712 had the lower hardness.