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← ScienceWhich chemical change results when ultraviolet radiation weakens polymers?
A)Chain scission reduces molar mass✓
B)Increased crosslinking enhances flexibility
C)Crystallinity induces thermal stability
D)Oxidation improves mechanical properties
💡 Explanation
Chain scission reduces molar mass because UV photons break covalent bonds in the polymer backbone, initiating free radical reactions. Therefore, causing degradation rather than crosslinking or oxidation, because those require stabilizing factors, rather than bond disruption from UV radiation.
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