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← ScienceWhich effect weakens polyvinyl chloride (PVC) pipes exposed to prolonged elevated temperatures despite static loading?
A)Chain scission due to oxidative degradation✓
B)Plasticizer leaching creating microcracks
C)Glass transition above operating temperature
D)Dehydrochlorination altering crosslinking
💡 Explanation
When PVC pipes are exposed to heat, oxidative degradation causes chain scission because oxygen radicals break the polymer chains, reducing pipe’s molecular weight and strength, even under static load. Therefore chain scission occurs, rather than leaching, transition changes, or dehydrochlorination that require different environmental influences or occur during processing before installation.
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