Abstract
A kinetic gravimetric sorption apparatus for measuring solubility and diffusivity of low vapor pressure gases and vapors in polymers and other sorbents is described. Sorption and transport data for toluene vapor in poly(dimethyl siloxane) at 25 °C are provided to illustrate the method. These data were obtained by measuring the kinetic uptake of a mixture of carrier gas and toluene vapor and, for comparison, pure toluene vapor at the same thermodynamic activity. Excellent agreement was observed between toluene solubility and diffusivity values obtained from these two different experiments. In the mixture sorption experiments, the type of carrier gas (helium or nitrogen) had no effect on measured toluene solubility and diffusion coefficients.
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