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Equilibrium volume and mass fractions of hydrogels in PBS (pH 7.4) at 37 °C over a 72 h period. A rapid increase from the relaxed volume fraction is observed over the first 12 h before a stable equilibrium volume fraction is obtained and sustained at a near constant value over 48 h. The mass fraction profile traces the volume fraction response but is offset by 2—3% for each time point.
