Which outcome is caused when epoxy adhesive is heated above its glass transition temperature (Tg)?

💡 Explanation

When epoxy is heated above its Tg, chain segments gain mobility, disrupting intermolecular forces because cohesive energy decreases, ultimately reducing resistance to deformation and lowering structural joint strength. Therefore, joint strength is reduced, rather than increased, cross-linking, or enhanced UV resistance which require specific chemical reactions or additives.

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