The stress–strain behaviour of which of the following polymeric materials shows large
recoverable strains produced at low stress levels?
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A.
Thermosetting polymer
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B.
Plastic polymer
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C.
Brittle polymer
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D.
Elastomer
Correct Answer:
D. Elastomer
Explanation:
The correct answer is Elastomer.
Elastomers are a specific class of polymers characterized by their unique ability to undergo significant deformation under relatively low stress and then return almost completely to their original shape once the stress is removed. This behavior is known as rubber-like elasticity. Unlike brittle polymers, which fracture with little deformation, or plastic polymers, which undergo permanent shape changes beyond their yield point, elastomers feature cross-linked molecular chains that allow for large, recoverable strains. According to standard stress-strain classifications, while most polymers exhibit some elastic behavior at very low levels, only elastomers maintain high recoverability after being stretched to several times their original length.
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