Question

The process of vulcanization makes rubber:
(A) Soluble in water,
(B) Elastic,
(C) Hard,
(D) Durable

• A. (A), (B), (C) only
• B. (B) and (C) only
• C. (A), (B), (C), and (D)
• D. (B), (C), and (D) only

Hint:

Vulcanization enhances rubber by introducing sulfur cross-links which create a stable three dimensional network in the polymer chains, thus improving its properties like elasticity, tensile strength, and durability.

Answer 1

The Correct Option is B

Vulcanization is a chemical process where rubber is heated with sulfur. This process:
• Forms cross-links between polymer chains of rubber molecules through disulfide bridges between the double bonds present in natural rubber.
• Increases elasticity: These cross-links make the rubber more elastic by reducing the movement of polymer chains.
• Increases hardness: It also makes it harder and more durable as it also increases the tensile strength.
• Reduced solubility It makes it less soluble in solvents.
Therefore, vulcanization makes the rubber more elastic and hard.