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← ScienceWhich outcome occurs when an epoxy adhesive cures, causing cross-linking between adjacent polymer chains?
A)Increased shear strength parallel to surface✓
B)Decreased impact resistance over time
C)Reduced thermal expansion coefficient
D)Elevated hardness because of plasticization
💡 Explanation
Epoxy curing induces cross-linking, where covalent bonds form between polymer chains, which enhances the adhesive's shear strength by creating a rigid, interconnected matrix. Therefore, shear strength increases, rather than decreased impact resistance, altered thermal expansion, or plasticity changes which require different molecular configurations or environmental effects.
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