Structure and Properties of Styrene butadiene rubber
While most of the properties of SBR are comparable with NR, but in some respects like heat build-up, tack and gum tensile strength make it inferior to natural rubber. Other disadvantages include: Low elongation at break Low hot tear strength Hysteresis, resilience But the addition of resins and reinforcing fillers adequately improve these properties. However, there are properties which makes it superior over natural rubber. These include: Better process ability, Slightly Better heat aging Better abrasion resistance and resistance to degradation (under heat) Also, scorch problems are less likely to occur with SBR than with NR. Overall, the most important factors in the commercial viability of SBR making it material of choice over other rubbers are: Wide availability Low cost compared with those of all other synthetic rubbers, Ability to accept high filler levels, Relatively stable price compared with that of NR and Overall properties on a cost/performance basis Rubber…