Experimental determination of possible diffusion models during pervaporation process in polymer membranes
DOI:
https://doi.org/10.15587/1729-4061.2014.27661Keywords:
polymer, membrane, pervaparation, thermal activation, free volume, diffusion, voids, jump, technologyAbstract
Some parameters that are influenced by the solvent molecule diffusion in the polymer membrane body were experimentally studied using a pervaporation process. The time dependencies of these parameters during the pervaparation were obtained. It was shown that the mechanism of the solvent molecule diffusion in the polymer membrane consists of two components: a diffusion through the thermal activation of the system and a diffusion occuring through the free volume. Moreover, the rate of thermally activated diffusion is much larger and is observed in the beginning of the pervaparation process. Whereas, a diffusion using the free-volume model begins to manifest itself in the middle of the process and passes more slowly, but it is the source of transferring the majority of solvent molecules. These results make it possible to interpret diffusion models in polymer membranes.
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