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← ScienceWhich consequence results when thermal vibration overcomes **van der Waals forces** in polymer films?
A)Increased chain mobility initiates dewetting✓
B)Crystallinity increases film strength sharply
C)Complete dissolution of the polymer occurs
D)Substrate adhesion forces cause violent delamination
💡 Explanation
Chain mobility and localized separations increase when **van der Waals forces** are overcome because thermal vibration provides energy sufficient to break weaker bonds. Therefore, initiating dewetting creates surface defects, rather than complete dissolution under ordinary lab conditions.
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