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Viscosity–shear rate profile (power-law model) at different salinities and temperature of 80 °C; (a, b) viscosity profiles of PEG and PPG hydrogels, respectively, at a concentration of 1.0 g/L; (c, d) viscosity profiles of PEG and PPG hydrogels, respectively, at a concentration of 1.5 g/L. The calculated parameters were assigned to their consistent color.
