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← ScienceWhich thermodynamic effect dominates when epoxy adhesive's crosslinking nears completion?
A)Exothermic heat generation accelerating curing✓
B)Endothermic cooling halting chain propagation
C)Entropic increase causing material expansion
D)Enthalpic decrease reducing surface adhesion
💡 Explanation
When epoxy adhesive reaches high conversion, highly exothermic polymerization proceeds because freed energy converts chemical bonds into heat, and heat raises temperature, self-accelerating curing speed. Therefore heat generation accelerating curing is most important, rather than cooling, entropy, or enthalpy, each requiring different thermochemical mechanisms.
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