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← ScienceWhich effect occurs when applying shear stress to hydrogels?
A)Viscosity decreases, demonstrating shear thinning✓
B)Crystallization increases polymer chain alignment
C)Glass transition causes immediate shattering
D)Elasticity increases, resisting shear force
💡 Explanation
Hydrogels exhibit shear thinning because the shear stress disrupts secondary molecular bonds linking cross-linked polymer chains, resulting in reduced viscosity. Therefore, the viscosity lessens, rather than changes like crystallization or elasticity which do not fit this mechanism.
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