Which outcome occurs when high shear stress is applied to polyvinyl alcohol (PVA) hydrogel's crosslinked structure?

💡 Explanation

When high shear stress is applied, chain scission occurs in the PVA hydrogel's covalent crosslinks, breaking polymer chains and decreasing the average molecular weight, which reduces elasticity. Therefore, permanent chain scission results, rather than viscosity increase, stable hardening, or interfacial tension, which involve other mechanisms.

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