A chromatographic method, namely, mass spectrometric tracer pulse
chromatography, MSTPC, was used to
measure the solubility of carbon dioxide in PMMA, poly(methyl
methacrylate), over a wide range of
temperatures (−10 to 180 °C) and pressures (<90 atm). In this
range of experimental conditions, CO2 was
present as a gas or supercritical fluid and the polymer was either in a
glassy or rubbery state (T
g =
100-110
°C). Three lattice theories were evaluated for correlation with
the experimental solubility data. The Sanchez−Lacombe, Panayiotou−Vera, and Martire−Boehm models were used to
calculate the densities of the pure
gas and binary liquid phases from an equation of state and the chemical
potential of CO2 in both the pure gas
and polymer mixtures. The solubility of CO2 in PMMA as
a function of temperature and pressure was
calculated from these three lattice theory models and compared with the
experimental data. Only one
temperature-dependent adjustable parameter was used in these
calculations to fit the theoretical models to the
experimental data.
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