Updated: May 3, 2020
Styrene-butadiene or styrene-butadiene rubber(SBR) describe families ofsynthetic rubbersderived fromstyreneandbutadiene. These materials have goodabrasionresistance and good aging stability when protected by additives. In 2012, more than 5.4 million tonnes of SBR were processed worldwide. About 50% of cartiresare made from various types of SBR. The styrene/butadiene ratio influences the properties of the polymer: with high styrene content, the rubbers are harder and less rubbery. SBR is not to be confused with thethermoplastic elastomer, styrene-butadieneblock copolymer, albeit being derived from the same monomers.
It is a commodity material which competes with natural rubber. The elastomer is used widely in pneumatic tires. This application mainly calls for E-SBR, although S-SBR is growing in popularity. Other uses include shoe heels and soles, gaskets, and even chewing gum. Latex (emulsion) SBR is extensively used in coated papers, being one of the cheapest resins to bind pigmented coatings. It is also used in building applications, as a sealing and binding agent behind renders as an alternative to PVA, but is more expensive. In the latter application, it offers better durability, reduced shrinkage and increased flexibility, as well as being resistant to emulsification in damp conditions.
SBR is often used as part of cement based substructural (basement)waterproofing systems where as a liquid it is mixed with water to form the Gauging solution for mixing the powdered Tanking material to a slurry. SBR aids the bond strength, reduces the potential for shrinkage and adds an element of flexibility. It is also used by speaker driver manufacturers as the material for Low Damping Rubber Surrounds. Additionally, it is used in some rubber cutting boards. SBR is also used as a binder in lithium-ion battery electrodes, in combination with carboxymethyl cellulose as a water-based alternative for, e.g. polyvinylidene fluoride. Styrene-butane rubber is also used in gasketed-plate heat exchangers. It is used at moderate temperature up to 85 deg C, (358 K) for aqueous systems.
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