Crosslink nature in Cr(III)-polyacrylamide gels
Date
2001ISSN
1022-1360Source
Macromolecular SymposiaVolume
171Pages
189-200Google Scholar check
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The equilibrium constants of various candidates for the crosslinking reaction between chromium(III) and partly hydrolysed polyacrylamide have been calculated. For this purpose use has been made of a) the crosslinking index in gels to calculate the concentration of crosslinks, b) pH-dependent concentrations of various hydrolysis products of Cr3+ ions and c) pH-dependent concentration of free carboxylic acid anions. The conclusion is that the crosslinks consist of two carboxylic acid anions coordinated with the dimerisation product of the Cr3+ ions.