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← ScienceWhich mechanism causes internal cracking in injection-molded plastic components after humid air exposure?
A)Hydrolytic degradation by chain scission✓
B)Crystallization through spherulitic growth
C)Plasticization decreases glass transition
D)Thermal expansion increases internal stress
💡 Explanation
Hydrolytic degradation introduces water, catalyzing chain scission in the polymer. This weakens the material, causing internal cracking because polymer bonds break under hydrolysis rather than maintain mechanical bonds under stress; therefore, it fails instead of remaining strong.
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