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← ScienceWhich structural change occurs because van der Waals interactions dominate within a polymer film close to its glass transition temperature?
A)Increased molecular chain segment mobility✓
B)Covalent bond breakage in backbone
C)Crystalline domain size reduction
D)Significant oxidation sites proliferation
💡 Explanation
More thermal energy increases vibrational amplitude, therefore increasing molecular chain segment mobility because weaker van der Waals forces weaken, rather than breakage of strong covalent bonds; therefore, chain interlock reduces rather than strengthens the oxidation sites.
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