Abstract
Cross-linked poly(2-hydroxyethyl)methacrylate (polyHEMA), a widely used biomedical material, was chosen for this study since it has been extensively studied with respect to interfacial phenomena. The SFG spectrum of the surface of hydrated polyHEMA was recorded under water. After removal from water, the material was again analyzed by SFG in air during which time ({approximately} 15 min) the water began to evaporate from the hydrogel. Finally, the material was dried extensively, and the SFG spectrum of the dehydrated sample was recorded in air. The dynamic behavior of polymer surfaces has drawn significant recent attention, particularly in the field of biomedical materials. Theoretical and experimental studies have shown that the surface properties of most polymers change in accordance with the nature of the surrounding medium, the thermodynamic driving force for the restructuring being minimization of interfacial free energy.
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