Factors defining the selectivity polymer membranes: A fractal model

Abstract

It is shown that the selectivity of the polymer nonporous membranes by the diffusivity depends on the polymer structure by rather complex way. The most important characteristic in this case is the dimension D t controlling the gas transport processes and the molecular mobility degree influences only at large enough values of diameter of the selected gas molecules, the difference of these diameters and the dimension D t .

The fractal calibration method applied to the characterization of polymers in solvent mixtures and in mixed gel packings by SEC

“…Furthermore, the fractal approach is receiving increasing attention not only on the SEC chromatographic field [14,15] but also in very different subjects such as the curing process of epoxy resins [16], the scattering behaviour of hyperbranched polymer structures [17], the stabilization process [18] and oxidation kinetics [19] of polymer melts, or the use of fractal models to account for the heat conductivity [20] and selectivity of polymer membranes [21].…”