The water sorption behaviour of several cross-linked gelatin-based sys
tems were investigated and compared. The systems were gelatin, gelatin
/ethyleneglycol, gelatin/polyoxypropylenediamine, and gelatin/polyethy
lene oxide. For a II the systems, an increased water gain was obtained
by raising the concentration of the second component, while the swell
ing was reduced by an increase of the cross-linking density.