Investigation of diffusion mechanisms during pervaporation of molecules of organic solvents in polymer membranes
DOI:
https://doi.org/10.15587/1729-4061.2015.53929Keywords:
polymer, membrane, pervaporation, thermal activation, free volume, diffusion, voids, jump technologyAbstract
With the help of the original experimental setup using a pervaporation process, parameters which allow to indirectly determine the mechanisms and models of diffusion of solvent molecules in the polymer membrane body were investigated. The time dependencies of these parameters during pervaporation were obtained for both unsaturated and saturated membranes. It was shown that the mechanism of diffusion of the solvent molecules in the polymer membrane for the unsaturated membranes consists of two components: diffusion through thermal activation of the system and diffusion occurring through the free volume. Moreover, the rate of thermally activated diffusion is much higher and is observed in the beginning of the pervaporation process, whereas the diffusion using the free-volume model begins to emerge in the middle of the process and runs more slowly, but it is a source of transfer of the majority of solvent molecules. For saturated membranes, the main transfer mechanism is diffusion through the structural voids of the polymer. These results allow to interpret diffusion models in polymer membranes.
References
- Burtna, I. А, Hachechiladze, O. О. (2014). Transfer processes in polymer membranes. Part 4. Eastern-European Journal of Enterprise Technologies, 2/6(68), 4–11. doi: 10.15587/1729-4061.2014.23383
- Cranc, J, Park, G. S. (1968). Methods of measurement in Diffusion in Polymers. New York: Academic Press, 1–39.
- Marion, K. Buckley-Smith. (2006).The Use of Solubility Parameters to select membrane materials for Pervaporation of organic mixtures. The University of WAIKATO. Hamilton, New Zealand,18–56.
- Burtna, I. А, Hachechiladze, O. О. (2013). Transfer processes in polymer membranes. Part 3. Eastern-European Journal of Enterprise Technologies, 6/6(66), 4–7. Available at: http://journals.uran.ua/eejet/article/view/18713/17124
- Burtna, I. А, Hachechiladze, O. О. (2014). Experimental determination of possible models of diffusion during pervaporation process in polymer membranes. Eastern-European Journal of Enterprise Technologies, 5/6(71), 26–32. doi: 10.15587/1729-4061.2014.27661
- Binning, R. C., Lee, R. J., Jennings, J. F., Martin, E. C. (1961). Separation of Liquid Mixtures by Permeation. Industrial & Engineering Chemistry, 53(1), 45–50. doi: 10.1021/ie50613a030
- Shao, D, Huang, R. Y. M. (2006). Polymeric membrane Pervaporation. Department of Chemical Engineering University of Waterloo, Ont, Canada, 162–175.
- Koros, W. J. (1990). Barrier Polymers and Structures. ACS Publications. Washington: D.C., 1, 1–21. doi: 10.1021/bk-1990-0423.ch001
- Meares, P. (1965). Polymers: Structure and Bulk Properties. London : D. Van Nostrand Co. LTD, 12, 381.
- Brandt, W. W. (1959). Self – Diffusion and Inter diffusion in Polymers. Journal of Physical Chemistry, 63, 1080–1088.
- DiBenedetto, A. T, Paul, D. R. (1964). Diffusion in amorphous polymers. Journal of Polymer Science, A (2), 1001–1015.
- Turnbull, D, Cohen, M. H. (1961). Free-volume model of the amorphous phase. Journal of Chemical Physics, 34, 120–131. doi: 10.1063/1.1731549
- Cohen, M. H, Turnbull, D. (1959). Molecular transport in liquids and glasses. Journal of Chemical Physics, 31 (5), 1164–1169. doi: 10.1063/1.1730566
- Duda, J. L, Vrentas, J. S, Ju, S. T, Liu, H. T. (1982). Prediction of diffusion Coefficients for polymers solvent systems. AIChE Journal, 28 (2), 279–285. doi: 10.1002/aic.690280217
- Reis, R. A., Oliveira, J., Nobrega, R. (2001). Diffusion Coefficients in Polymer – Solvent Systems for Highly Concentrated Polymer Solutions. Brazilian Journal of Chemical Engineering, 18 (4), 221–232. doi: 10.1590/s0104-66322001000400003
- Burtna, I. А. (2013). Transfer processes in polymer membranes. Part 2. Eastern-European Journal of Enterprise Technologies, 2/11(61), 41–44. Available at: http://journals.uran.ua/eejet/article/view/11731/9873
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2015 Инесса Анатольевна Буртная, Отар Отарович Гачечиладзе
This work is licensed under a Creative Commons Attribution 4.0 International License.
The consolidation and conditions for the transfer of copyright (identification of authorship) is carried out in the License Agreement. In particular, the authors reserve the right to the authorship of their manuscript and transfer the first publication of this work to the journal under the terms of the Creative Commons CC BY license. At the same time, they have the right to conclude on their own additional agreements concerning the non-exclusive distribution of the work in the form in which it was published by this journal, but provided that the link to the first publication of the article in this journal is preserved.
A license agreement is a document in which the author warrants that he/she owns all copyright for the work (manuscript, article, etc.).
The authors, signing the License Agreement with TECHNOLOGY CENTER PC, have all rights to the further use of their work, provided that they link to our edition in which the work was published.
According to the terms of the License Agreement, the Publisher TECHNOLOGY CENTER PC does not take away your copyrights and receives permission from the authors to use and dissemination of the publication through the world's scientific resources (own electronic resources, scientometric databases, repositories, libraries, etc.).
In the absence of a signed License Agreement or in the absence of this agreement of identifiers allowing to identify the identity of the author, the editors have no right to work with the manuscript.
It is important to remember that there is another type of agreement between authors and publishers – when copyright is transferred from the authors to the publisher. In this case, the authors lose ownership of their work and may not use it in any way.
