Calculation of Effective Diffusion and Solubility Coefficients in Non-Fickian Materials, 2002 PLACE Conference Proceedings
Many studies have been conducted involving the measurement of permeation of water vapor and oxygen.
These methods have been documented and most of the techniques are well established. However, an
increasing amount of work is being conducted in the area of organic or solvent permeation, an area not as
extensively developed. Studies involving the permeation of organic compounds may result in non-Fickian
solutions, where the diffusion coefficient is changing with concentration in the film. For research and
development applications, the calculation of the solubility (S) and diffusion (D) coefficients is crucial. For
non-Fickian situations, such as most organic permeation, the measurement and/or calculation of S and D
can be difficult. This paper reviews methods for determining the effective S and D coefficients.