Q.Write a note on vulcanization of rubber

Step 1. Section 15.4.5 recounts the discovery: in 1839, Charles Goodyear accidentally dropped natural rubber and sulphur onto a hot stove and found the resulting rubber had become strong and elastic -- he named the process vulcanization.

Step 2. The practical process: natural rubber is mixed with 3-5% sulphur and heated at 100-150 degC, which cross-links the cis-1,4-polyisoprene chains via disulphide (-S-S-) bonds. …

Recount the Goodyear discovery, the disulphide cross-linking mechanism, and the sulphur-con …

• Describing vulcanization only as "adding sulphur to rubber" without the mechanism (disulphide cross-links between polyisoprene chains) that act …