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← ScienceWhich outcome occurs when applying excessive shear stress to a polymer during injection molding?
A)Chain scission forms smaller polymers✓
B)Increased crystallinity enhances rigidity
C)Accelerated cross-linking creates hardening
D)Reduced gas permeability limits cooling
💡 Explanation
Chain scission occurs because high shear forces break covalent bonds within polymer chains, therefore reducing the average molecular weight of the polymer, rather than increasing crystallinity or cross-linking which occur through different mechanisms.
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