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← ScienceWhich outcome occurs when a polymer's cross-link density exceeds the optimal for shape-memory?
A)Increased elastic return stress
B)Reduced glass transition temperature
C)Prevents complete shape recovery✓
D)Promotes greater elastic deformation
💡 Explanation
Excessive cross-linking impedes chain mobility, therefore preventing complete shape recovery because it hinders segmental motion, disrupting the entropic elasticity, rather than enhancing elasticity or modifying thermal properties directly.
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