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 th

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?

Prashant Kotian · Accepted Answer

Correct answer: C. 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 cross-linking.

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