The glass transition temperature (Tg) for a material is
A) the temperature that the polymer is unusable.
B) the temperature that the polymer melts.
C) the temperature above which the material is hard and brittle and the temperature below which the material is tough and rubbery.
D) the temperature below which the material is hard and brittle and the temperature above which the material is tough and rubbery.
Correct Answer:
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