Question

Which among the following is a cross-linked polymer?

• A. PVC
• B. Orlon
• C. Vulcanised rubber
• D. Polypropylene

Hint:

Cross-linking improves mechanical strength and thermal stability of polymers.

Answer 1

The Correct Option is C

Step 1: Define cross-linked polymer.
Cross-linked polymers have covalent bonds connecting different polymer chains, forming a three-dimensional network.
Step 2: Vulcanisation process.
In vulcanised rubber, sulphur forms cross-links between polyisoprene chains, increasing strength and elasticity.
Step 3: Eliminate other options.
PVC, Orlon, and polypropylene are linear polymers without cross-linking.
Step 4: Conclusion.
Therefore, vulcanised rubber is a cross-linked polymer.