Cure characteristics and mechanical properties of styrene-butadiene rubber/acrylonitrile butadiene rubber

摘要

Blends of styrene butadiene rubber (SBR) and acrylonitrile-butadiene rubber (NBR) were prepared. Sulfur, dicumyl peroxide (DCP) and a combination of sulfur and DCP were used as vulcanizing agents. The effects of blend ratio and vulcanizing systems on the cure characteristics and mechanical properties, such, as stress-strain behaviour, Young's modulus, tensile strength, elongation at break and hardness of SBR/NBR blends, were studied. Blends prepared by using sulfur as the vulcanizing agent showed comparatively better mechanical properties. Tensile and tear strengths showed synergism for the blends containing 60 percent SBR. The morphology of the blends was examined to correlate with observations on mechanical properties by using an optical microscope with special reference to the effects of blend ratio. A relatively co-continuous morphology was observed for 60:40 SBR/NBR composition.