Which outcome is accelerated within polymers exposed to UV radiation in the presence of oxygen?

💡 Explanation

When UV radiation and oxygen are present, photo-oxidation via Norrish reactions occurs because the UV light cleaves the polymer chains, which then react with oxygen, leading to chain scission and degradation. Therefore, chain scission accelerates, rather than crystallization, increased glass transition, or cross-linking, which involve different reaction triggers.

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