Discussion
An elastomer recovers its shape after large deformation because it has
Answer: A
Correct answer: light cross-linking above its glass transition
An elastomer needs both conditions. Being above its glass transition, the chains are free to move and can be uncoiled by an applied stress; being lightly cross-linked, they cannot slide permanently past one another, so the network pulls them back when the stress is removed. Heavy cross-linking gives a rigid thermoset, and no cross-linking at all gives a material that flows and does not recover.
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