Question
Discuss the main purpose of vulcanisation of rubber.
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Answer
Natural rubber becomes soft at high temperature (> 335K) and brittle at low temperatures (<283K). To improve physical properties of rubber, 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 373K to 415K. On vuclcanisation, sulphur forms cross links at the reactive sites of double bonds and thus the rubber gets stiffened.
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