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Which outcome follows after exceeding glass transition temperature in amorphous polymer thread inserted into composite material?

A)Increased ductility, reduced thread stiffness
B)Microcracking, increased thread brittleness
C)Accelerated oxidation, depolymerization onset
D)Crystallization, increased tensile strength

💡 Explanation

When glass transition temperature is exceeded, increased molecular motion occurs because thermal energy overcomes intermolecular forces, leading to increased ductility and decreased stiffness. Therefore ductility is predictably enhanced, rather than brittleness, oxidation or crystallization, which necessitates substantially more energy or specific cooling rates.

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