Ps] and the interaction of the gas molecules with the matrix as indicated in the changes in the solubility coefficient.
The effective solubility coefficients were then estimated using Eq.
In two-phase mixtures, such as 50% of octane and 50% of water, the ozone solubility coefficients
in both phases were close to each other, and for the whole range of the inlet ozone concentration in gas were equal to 0.
Figure 9 presents the pure gas permeability, diffusion, and solubility coefficients of the membranes at 35[degrees]C as a function of UV irradiation time.
The apparent gas diffusion and solubility coefficients of the UV-cured membranes as a function of UV irradiation time are presented in Fig.
At rubbery polymer of PDMS in comparison with glassy polymer of PES, penetrant solubility coefficient
is more important than diffusion coefficient.
The solubility coefficients
, S, were then calculated from
Since permeation is a solution-diffusion process, the permeability, P, is the product of the diffusion and solubility coefficients
and can be expressed by the following equation:
K = Solubility coefficient
(or Henry's law constant), kg/kg [multiplied by] MPa.
For the simplest practical cases of m = 2 and m = 3, we present the diffusion behaviors assuming stepwise distribution of both diffusion and solubility coefficients
at the interfacial boundary, changing the penetrant concentration distributions with time in each layer while varying the ratio of the diffusion coefficient and/or the solubility coefficient
, and simulating the sorption curves after exposing the film to the atmosphere of fixed penetrant vapor pressure [p.
In fact, while in certain cases, researchers ascribed the low permeability values to surprisingly low solubility coefficients
(14-18), in one case the low value of permeability was attributed to a low diffusion coefficient (19).
the membrane permeation model, the effective diffusion coefficient is evaluated by measuring polymer intrinsic diffusion and solubility coefficients
of the gas component in the polymer matrix for all the gases involved [4, 6].