styreenibutadieenikumi

Styrene-butadiene rubber, abbreviated SBR, is a synthetic elastomer produced by the copolymerization of styrene and butadiene. It is one of the most widely used synthetic rubbers, valued for a balance of processability, wear resistance, and cost. The vinyl content from styrene and the distribution of monomer units determine its mechanical properties and temperature performance.

Most commercial SBR is made by emulsion polymerization, forming a latex that is coagulated into solid rubber. A smaller share is produced by solution polymerization, which can yield lower Mooney viscosity and better processability in some applications. SBR grades are available with varying styrene content and molecular weight, and a related material, solution styrene-butadiene rubber (SSBR), is used for high-performance tires and specialized seals.

Key properties include good abrasion resistance and aging stability, good processability, and compatibility with carbon black reinforcement. SBR typically exhibits adequate elasticity and resilience but has lower heat resistance and poorer low-temperature performance than some other rubbers. Its properties can be tuned through formulation, including fillers, oil extenders, crosslinking systems (sulfur or peroxides), and coagents.

Primary applications are in tires (especially tread compounds), belts, hoses, seals, and footwear soles. SBR is often used in combination with other elastomers to achieve a balance of properties. Environmental and economic factors reflect its status as a petrochemical-derived material, with ongoing research into improved fillers, processing techniques, and recycling.