SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at_________________?
Correct answer: A. 1: 3
- A. 1: 3
- B. 3 : 1
- C. 1 : 2
- D. 2 : 1
Explanation
SBR typically contains about 25% styrene and 75% butadiene by weight, giving a styrene-to-butadiene ratio of 1:3. The butadiene fraction provides rubbery elasticity, while styrene improves strength.
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