What are the structural monomer components of the synthetic rubber Buna-S?
Answer and explanation
Correct answer: B. Buta-1,3-diene and styrene
- Step 1: The name Buna-S is derived from Bu (butadiene), Na (sodium, the original polymerization catalyst), and S (styrene).
- Step 2: It is synthesized by the free-radical copolymerization of buta-1,3-diene () and styrene () in the presence of a peroxide catalyst.
- Step 3: Buna-S (SBR, styrene-butadiene rubber) exhibits high abrasion resistance and load-bearing capacity, making it the principal material for automobile tire manufacture.
Answer
Buta-1,3-diene and styrene.
Why not the others: Buta-1,3-diene and acrylonitrile form Buna-N (nitrile rubber), resistant to oils; Chloroprene and isobutylene is an incorrect mixture; Isoprene is the monomer of natural rubber.
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