Abstract
A multicomponent model that imposes conservation laws and constitutive relations for polymer chains, water, and ions was investigated by determining the transient changes in a negatively charged gel exposed to a solution containing both mono-and divalent cations. Association of ion exchange with gel volume is achieved by imposing a linear relation between the polymer-solvent interaction parameter and concentration of divalent cations adsorbed onto the polymer chains. Semiquantitative agreement with measurements made on sodium polyacrylate gels is demonstrated in three aspects: (1) dynamics of gel swelling and deswelling, (2) ion partitioning coefficient, and (3) effect of cross-link density. These results imply that the multicomponent coarse-grained continuum modeling approach can be useful for quantitative predictions over macroscopic length and timescales including the description of volume transitions exhibited by these systems.
| Original language | English |
|---|---|
| Article number | 035602 |
| Journal | Physical Review Materials |
| Volume | 6 |
| Issue number | 3 |
| DOIs | |
| State | Published - 24 Mar 2022 |
Bibliographical note
Publisher Copyright:© 2022 American Physical Society.
ASJC Scopus subject areas
- General Materials Science
- Physics and Astronomy (miscellaneous)