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← ScienceWhich outcome will arise if a high-intensity UV light source degrades a polycarbonate lens by chain scission?
A)Increased light transmission at all wavelengths
B)Decreased impact resistance and embrittlement✓
C)Increased refractive index in visible spectrum
D)Increased thermal stability due to crosslinking
💡 Explanation
When UV light degrades polycarbonate, chain scission occurs as photons break covalent bonds, resulting in shorter polymer chains and lowered molecular weight which leads to brittleness. Therefore decreased impact resistance will happen, rather than alterations to the optical or thermal properties, which require different molecular changes.
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