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← ScienceWhich consequence results when prolonged UV exposure cleaves polymers?
A)Reduced material tensile strength✓
B)Increased thermal conductivity
C)Enhanced piezoelectric generation
D)Improved electrical insulation
💡 Explanation
Prolonged UV exposure breaks covalent bonds via photo-oxidation leading to chain scission. This Bond Dissociation Energy mechanism reduces the average molecular weight and polymer chain entanglement; therefore tensile strength drops, rather than conductivity increasing, because conductivity needs free electrons.
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