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← ScienceWhich consequence arises from exceeding crosslink density limits during polymer curing?
A)Increased brittleness and fracture propagation✓
B)Enhanced flexibility by chain disentanglement
C)Improved solvent resistance and barrier
D)Reduced glass transition temperature (Tg)
💡 Explanation
Exceeding acceptable crosslink density promotes brittleness because covalent bond formation via crosslinking restricts polymeric chain mobility, influencing the material’s properties. Therefore, increased stress concentrations from these tight linkages result in fracture propagation, rather than promoting chain entanglement
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