Styrene-butadiene rubber monomers: 1, 3- butadiene (CH2=CH-CH=CH2) and styrene (C6H5C2H3).
Polymerization: CH2 = CH-CH = CH2+C6H5-CH = CH2 -→ [CH2-CH = CH-CH2-CH (C6H5)-CH2]-N
Styrene-butadiene rubber is the general synthetic rubber with the largest output, including emulsion polymerized styrene-butadiene rubber and solution polymerized styrene-butadiene rubber. Styrene-butadiene rubber (SBR) is a yellowish brown elastic solid. Its density increases with the increase of styrene content, and its oil resistance is poor, but its dielectric properties are good. The tensile strength of rubber is only 20-35 kgf/cm2, and it can reach 250-280 kgf/cm2 after being reinforced with carbon black. Its adhesiveness, elasticity and deformation calorific value are not as good as natural rubber, but its wear resistance, natural aging resistance, water resistance and air tightness are better than natural rubber, so it is a kind of rubber with good comprehensive properties. Styrene-butadiene rubber is the pillar product of rubber industry. It is a variety of synthetic rubber with the most varieties, good comprehensive performance and low price. It can replace natural rubber in most occasions, and is mainly used in rubber products such as tire industry, auto parts, hoses, adhesive tapes, rubber shoes, wires and cables.