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← ScienceWhich risk increases when cross-linked polymer films degrade under UV radiation?
A)Chain scission becomes more pronounced✓
B)Crystallinity of increases sharply locally
C)Glass transition temperature plateaus faster
D)Hydrogen bonding becomes irreversibly stronger
💡 Explanation
Chain scission occurs because UV exposure facilitates photochemical degradation of the bonds in polymer chains, thereby weakening its structure; therefore, A is correct rather than options B/C/D which would require different triggers.
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