The Properties of Water
in Swollen Cross-Linked Polystyrene Sulfo Acids

A. N. Gagarin, M. G. Tokmachev, S. S. Kovaleva, and N. B. Ferapontov

Faculty of Chemistry, Moscow State University, Moscow, 119992 Russia

e-mail: a.gagarin@phys.chem.msu.ru

Received October 25, 2007

Abstract—The properties of water in polystyrene sulfo acid gels with various cross-linking degrees were stud-
ied by optical volumetry and dynamic desorption porosimetry. The isotherms of water desorption obtained by
dynamic desorption porosimetry coincided with isopiestic isotherms, which allowed this method to be recom-
mended for the determination of the amount of water in polymer gels. Joint optical volumetry and dynamic des-
orption porosimetry studies showed that the interphase boundary in the cross-liked hydrophilic polymer–water
system did not coincide with the visible gel boundary, because gels were two-phase systems, which contained
water of two types, “free” and “bound.” The influence of the degree of polymer cross-linking on the amounts
and properties of water of the two types was studied. It was shown that constants of water distribution in the
polymer could be calculated from the dynamic desorption porosimetry data.

DOI: 10.1134/S0036024408110137

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