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← ScienceWhich risk increases when injection-molding polyethylene with excessively high shear rates?
A)Increased polymer chain scission✓
B)Enhanced crystalline domain formation
C)Reduced overall cycle time
D)Improved surface finish uniformity
💡 Explanation
High shear rates introduce a mechanical stress exceeding polymer bond energies, the mechanochemical scission dominates, because these conditions generate free radicals leading to chain breaking, therefore material strength decreases rather than crystallinity increasing due to chain alignment in this extrusion context.
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