Which of the following is the deformation behaviour of glassy thermoplastics below their glass transition temperatures?
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A.
Flexible
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B.
Soft
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C.
Ductile
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D.
Brittle
Correct Answer:
D. Brittle
Explanation:
Below their glass transition temperature (Tg), glassy thermoplastics exhibit brittle deformation behavior. In this state, polymer chains are effectively locked in place by strong intermolecular forces, which restricts molecular mobility and prevents plastic flow. Consequently, when stress is applied, these materials undergo minimal elastic deformation before failing or fracturing abruptly, rather than yielding or stretching. While these polymers become ductile and capable of plastic deformation above Tg, they remain stiff and brittle at lower temperatures.
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