MCQ
The monomer of Buna$-S$ are:
  • Styrene and butadiene
  • B
    Isoprene and butadiene
  • C
    Vinyl chloride and Sulphur
  • D
    Butadiene.

Answer

Correct option: A.
Styrene and butadiene
Styrene and $1,3 -$ Butadiene.
Styrene$-$butadiene or styrene$-$butadiene rubber $\text{(SBR)}$ describe families of synthetic rubbers derived from styrene and butadiene $($the version developed by Goodyear is called Neolite$).$
These materials have good abrasion resistance and good ageing stability when protected by additives.
About $50\%$ of car tires are made from various types of $\text{SBR}.$ The styrene/butadiene ratio influences the properties of the polymer: with high styrene content, the rubbers are harder and less rubbery.

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