Heating of rubber with sulphur is known as

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(B) To improve physical properties such as water repellency,reduced water absorption,and resistance to oxidising agents,a process called vulcanisation

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Vulcanisation

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(B) To improve physical properties such as water repellency,reduced water absorption,and resistance to oxidising agents,a process called 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 $415 \ K$. On vulcanisation,sulphur forms cross-links at the reactive sites of double bonds,which causes the rubber to become stiffened.

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