Polymer Science Series A

, Volume 51, Issue 5, pp 550–553 | Cite as

Swelling-contraction of sodium polyacrylate hydrogels in media with various pH values

  • G. K. ElyashevichEmail author
  • N. G. Bel’nikevich
  • S. A. Vesnebolotskaya
Polymer Networs


The swelling kinetics of sodium polyacrylate gels has been studied in media with different pH values. The pH dependence of the degree of equilibrium swelling shows a maximum at pH 6. The degree of swelling decreases with an increase in the crosslink density, and this dependence follows an S-shaped pattern for all examined gels. When a gel swollen in media with pH 3–13 is dried in air, its contraction is reversible, while in the case of the gel swollen in acidic media at pH < 3, the process is irreversible owing to the replacement of sodium ions with protons.


Acrylic Acid Polymer Science Series Crosslinking Agent Crosslink Density Sodium Cation 
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Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  • G. K. Elyashevich
    • 1
    Email author
  • N. G. Bel’nikevich
    • 1
  • S. A. Vesnebolotskaya
    • 1
  1. 1.Institute of Macromolecular CompoundsRussian Academy of SciencesSt. PetersburgRussia

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