Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/51331
Title: Activity of counterions in hydrogels based on poly(acrylic acid) and poly(methacrylic acid): Potentiometric measurements
Authors: Safronov, A. P.
Kamalov, I. A.
Shklyar, T. F.
Dinislamova, O. A.
Blyakhman, F. A.
Issue Date: 2012
Citation: Activity of counterions in hydrogels based on poly(acrylic acid) and poly(methacrylic acid): Potentiometric measurements / A. P. Safronov, I. A. Kamalov, T. F. Shklyar, O. A. Dinislamova, F. A. Blyakhman // Polymer Science - Series A. — 2012. — Vol. 54. — № 11. — P. 909-919.
Abstract: The behavior of partially ionized weakly crosslinked gels based on poly(acrylic acid) and poly(methacrylic acid) undergoing contraction in the presence of a low-molecular-mass salt is studied exper- imentally. The concentration dependences of the enthalpies of swelling of gels in water and aqueous solutions with potassium chloride concentrations of 1, 10, and 100 mmol/L are determined via the method of isother- mal calorimetry. On the basis of the obtained data, the enthalpy parameter of interaction between a polymer network and a medium is estimated as a function of the amount of the salt. This parameter does not exceed 0.3 and monotonically decreases with an increase in the concentration of the salt. The Donnan potential of gels depending on the concentration of KCl in the external solution is measured via the method of potenti- ometry with the use of capillary electrodes, and the activity of potassium counterions in the medium of hydro- gel is calculated. The main factor that causes contraction of polyelectrolyte gels in a solution of a low-molec- ular-mass salt is a decline in the activity of counterions that leads to a decrease in the osmotic pressure inside the gel. A decline in activity may be associated with both a reduction in the activity coefficient and ionic asso- ciation processes in the hydrogel. © Pleiades Publishing, Ltd., 2012.
URI: http://hdl.handle.net/10995/51331
SCOPUS ID: 84870565433
WOS ID: WOS:000311202300011
PURE ID: 1072911
ISSN: 0965-545X
1555-6107
DOI: 10.1134/S0965545X12090088
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.