What are elastomers ?
Distinguish between thermoplastic polymers and thermosetting polymers.

Explanation

Elastomers : When polymer is stressed, the polymer chain stretches, but due to cross linking tearing is prevented , when the stain is relieved the chain returns to its original position. Thus, polymers show elasticity and are called elastomers.
Thermoplastic polymers : These polymers are called thermoplastic as on heating they becomes soft and on cooling become hard. Hence, these polymers can be remolded and recycled.e.g., polythene, polystyrene, PVC, etc.
Thermosetting polymers : These do not become soft on heating under pressure, hence cannot be remoulded and recycled. These are cross linked polymers and cannot be reused.e.g., bakelite.