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Crosslink nature in Cr(III)‐polyacrylamide gels
Author(s) -
te Nijenhuis Klaas
Publication year - 2001
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200106)171:1<189::aid-masy189>3.0.co;2-2
Subject(s) - polyacrylamide , hydrolysis , chemistry , ion , polymer chemistry , chromium , equilibrium constant , inorganic chemistry , organic chemistry
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 Cr 3+ 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 Cr 3+ ions.