During the vulcanization of natural rubber with sulphur, what specific sites on the polyisoprene chains are primarily attacked to form the intermolecular cross-links?

Question

During the vulcanization of natural rubber with sulphur, what specific sites on the polyisoprene chains are primarily attacked to form the intermolecular $-S-S-$ cross-links?

Prashant Kotian · Accepted Answer

Correct answer: C. Vulcanization involves heating rubber with sulphur. The sulphur forms cross-links (bridges) between separate polymer chains specifically at the highly reactive allylic carbon positions (next to the double bond) or directly across the double bonds themselves.

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