Which 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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Which outcome occurs when applying excessive shear stress to a polymer during injection molding?

💡 Explanation

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