Abstract
AbstractSorption of phenylethyl alcohol (a model drug preservative) by bromobutyl rubber (a polymer used in drug packaging) is characterized by relatively low apparent diffusivities at room temperature (D ≈︁ 10−10 cm2/s) and a high solubility that leads to considerable swelling of the polymer. The sorption curves for thin samples exhibit non‐Fickian anomalies, which are normally observed only in glassy polymers, including two‐stage sorption and sorption overshoot. The desorption curves were much more Fickian. The swelling kinetics were very slow, and true equilibrium was not reached in the time frame of most of the experiments, which ranged up to 78 days. This produced lower apparent diffusivities and higher activation energies for sorption compared to desorption.
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