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The monomers of buna-S rubber are
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styrene and butadiene
Buna-S rubber is also called SBR styrene -butadiene rubber. It is a copolymer of $75 \%$ butadiene $\left(\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}\right)$ and $25 \%$ styrene $\left(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}=\mathrm{CH}_{2}\right)$.
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