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← ScienceWhich outcome results when excessive molecular vibration occurs within polyethylene?
A)Increased material thermal expansion✓
B)Increased polymer chain alignment
C)Decreased polymer mechanical damping
D)Reduced chemical cross-linking density
💡 Explanation
Increased material thermal expansion results because excessive molecular vibration overcomes intermolecular forces, increasing the average separation distance; this is the process of thermal expansion rather than chain alignment because polymer chains lose overall coherence due increased kinetic energy.
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