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← ScienceWhich structural weakness worsens when molecular contamination embrittles spacecraft polymers?
A)Yield strength decreases rapidly✓
B)Deformation becomes purely elastic
C)Thermal expansion coefficient shrinks
D)Dielectric constant rises sharply
💡 Explanation
Decreased yield strength results when contaminants weaken the polymer's intramolecular force via chain scission. This is Stress Corrosion Cracking because the lower yield allows crack propagation, therefore structural integrity decreases sharply, rather than alternate modulus changes.
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