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← ScienceWhich mechanical effect results when thermal budget surpasses cross-link density?
A)Elastomer experiences viscosity reduction✓
B)Tensile strength increases linearly
C)Glass transition temperature elevates
D)Volumetric thermal expansion reduces
💡 Explanation
A polymer matrix softens when heated due to chain mobility; the scission of cross-links via Thermal Degradation reduces the energy required for deformation because the chains slip more easily, therefore the viscosity decreases, rather than the matrix maintaining its solid characteristics.
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