Butyl rubber exhibits exceptionally low gas permeability, making it ideal for the inner tubes of tyr — Polymers Chemistry Question
Question
Butyl rubber exhibits exceptionally low gas permeability, making it ideal for the inner tubes of tyres. It is a copolymer of 98% isobutylene and 2% isoprene. What is the precise chemical purpose of the 2% isoprene?
Answer: C
💡 Solution & Explanation
Polyisobutylene lacks double bonds in its backbone and thus cannot be vulcanized. The trace 2% isoprene is strictly added to provide the necessary unsaturated sites for $-S-S-$ cross-linking.
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