Which two monomers are combined to make styrene-butadiene rubber?

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Styrene-butadiene rubber (SBR) is a synthetic rubber produced by the copolymerization of two specific monomers: styrene and butadiene.12

Typically, this copolymer consists of approximately 75 percent butadiene and 25 percent styrene. These monomers are linked together to form long, multiple-unit molecules through either emulsion or anionic polymerization processes. Once formed, the resulting polymer chains are often cross-linked through vulcanization to create a durable, abrasion-resistant material widely used in applications such as automobile and truck tires.12