Vulcanization of rubber is carried out by heating a mixture of

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Natural rubber may be considered as a linear polymer of isoprene ( 2 -methyl- 1 ,   3 -butadiene) and is also called as cis - 1 ,   4 - polyisoprene. To improve the physical properties, a process of vulcanisation is carried out. This process consists of heating a mixture of raw rubber with sulphur and an appropriate additive at a temperature range between 373   K to 415   K . In the manufacture of tyre rubber, 5 % of sulphur is used as a cross linking agent. The probable structures of vulcanised