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← ScienceWhich outcome occurs when heating thermosetting polymers above vitrification?
A)Polymer chains undergo network degradation✓
B)Covalent bond rotations significantly decrease
C)Intermolecular hydrogen bonds temporarily dominate
D)Van der Waals bonds maintain stability
💡 Explanation
Network degradation prevails because, above vitrification temperature, the kinetic energy overcomes cross-linked covalent bonds, therefore the thermoset degrades irreversibly, rather than temporarily becoming more pliable from increased chain flexibility like thermoplastics.
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