Question

In vulcanization of rubber :

• A. sulphur reacts to form a new compound
• B. sulphur cross-links are introduced
• C. sulphur forms a very thin protective layer over rubber
• D. all statements are correct

Answer 1

The correct option is B sulphur cross-links are introduced

Vulcanisation of rubber-

To improve these physical properties,

• Strength
• Resistance for oxidation
• Repulsion from water

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 $373Kto415K.$ On vulcanisation, sulphur forms cross links at the reactive sites of double bonds and thus the rubber gets stiffened.

The correct option is [B].