Which outcome occurs when a screw pump handling viscous polymer experiences excessive shear rates?

💡 Explanation

When a highly viscous polymer solution is pumped at excessive shear rates, polymer chain scission occurs because the mechanical stress exceeds the bond strength, leading to chain breakage and subsequent degradation. Therefore, polymer chain scission results, rather than cavitation, overheating, or leakage, which would have different mechanisms for viscous shear.

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