Question

Write a note on vulcanised rubber.

Answer 1

Vulcanized rubber is a material that undergoes a chemical process known as vulcanization. This process involves mixing natural rubber with additives such as sulfur and other curatives. Vulcanization makes rubber much stronger, more flexible, and more resistant to heat and other environmental conditions. Vulcanized rubber makes both soft and hard objects, ranging from rubber bands to bowling balls. In fact, almost any rubber object consists of vulcanized rubber.

Answer 2

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The process of heating a mixture of raw rubber with sulphur and a appropriate additive at a temperature range between 373K to 415K is called valcanisation.

• Vulcanisation form sulphur crosslinks at the reactive sites of double bond and the rubber gets stiffened.

Example:

• Manufacture of tyre include 5% of sulphur.

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