Abstract
In situ Fourier transform IR and UV–vis spectroscopy have been used for partitioning of solutes between supercritical (sc) CO 2 and polymer phases. Partitioning of deuterated water and azo-dyes between poly(methyl methacrylate) and scCO 2 have been measured. Despite the low solubilities of polar azo-dyes in scCO 2 the partition coefficient of these dyes is ca. 10 4. In addition, the degree of partitioning of cosolvents methanol and acetone from scCO 2 into cross-linked poly(dimethylsiloxane) as well as the pressure dependence of the partition coefficient have been determined. Specific intermolecular interactions have been identified and related to the cosolvent partitioning between scCO 2 and polymer phases.
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