What is the lowest temperature at which rubber-like behaviour persists for many of the common elastomers and below which an elastomer becomes brittle?
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A.
Critical temperature
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B.
Curie temperature
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C.
Glass transition temperature
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D.
Neel temperature
Correct Answer:
C. Glass transition temperature
Explanation:
The glass transition temperature (Tg) is the correct answer because it represents the specific thermal point where an elastomer shifts from a flexible, rubbery state to a hard, brittle, "glass-like" state. Above this temperature, polymer chains have enough molecular mobility to slide and stretch, allowing the material to retain its elastic properties. When the temperature drops below the Tg, molecular motion becomes restricted and the material loses its ability to respond to forces, making it susceptible to fracturing or shattering upon impact. While other temperatures like the TR10 or T70 are used to predict sealing limits, the glass transition temperature is the fundamental physical threshold for the onset of brittle behavior in elastomers.
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