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← ScienceWhich outcome occurs when a polymer's plasticizer weakens?
A)Decreased chain mobility and embrittlement✓
B)Increased hydrogen bonding, water ingress
C)Accelerated cross-linking and hardness
D)Enhanced crystallinity increases yield strength
💡 Explanation
Weakening plasticizer causes reduced chain mobility because it interferes with intermolecular forces, triggering the glass transition and embrittlement. Therefore, the material becomes brittle, rather than harder or more crystalline, owing to the change.
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