Abstract
The swelling of a Nafion polymer membrane in water poured into a cell with a characteristic size close to the membrane thickness has been studied experimentally using Fourier IR spectroscopy. The interest in these studies is due to the fact that the Nafion swelling in a cell whose size greatly exceeds the membrane thickness is accompanied by intense unwinding of polymer fibers into the water bulk. However, this process had not been studied in the case where the region that can be occupied by unwound polymer fibers is limited by the cell size. It is shown that the temporal dynamics of the polymer transition from hydrophobic to hydrophilic state has some peculiar features in this case, which are determined by the cell size, isotopic composition, and preliminary treatment (intense shaking) of the liquid in which a Nafion sample swells.
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Funding
This study was supported by a grant of the Ministry of Higher Education and Science of the Russian Federation on carrying out large-scale scientific projects in priority fields of science and technology (no. 075-15-2020-774).
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Translated by Yu. Sin’kov
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Bolotskova, P.N., Bunkin, N.F., Kozlov, V.A. et al. The Role of Shaking of a Liquid Sample in the Dynamics of Polymer Membrane Swelling: A Cell of Limited Volume. Phys. Wave Phen. 29, 114–122 (2021). https://doi.org/10.3103/S1541308X21020047
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DOI: https://doi.org/10.3103/S1541308X21020047