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← ScienceWhich consequence results when sustained high temperature exceeds a polymer's limits?
A)Accelerated chain scission degrades strength✓
B)Increased crystallinity improves dimensional stability
C)Enhanced crosslinking forms network bonds
D)Depolymerization drives increased toughness locally
💡 Explanation
Heating a polymer accelerates chain scission, because thermal energy breaks covalent bonds in the polymer backbone. Chain scission therefore lowers the average molecular weight and strength, rather than other effects like increased crosslinking or crystallinity, which demand new ordering.
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