Water in dextran hydrogels

A series of dextran hydrogels were synthesized with potassium chloride as a crosslinker. 13C-NMR and 17O-NMR were used to study the crosslinking role of potassium chloride. Differential scanning calorimetry and thermogravimetric analysis were used to study the state and properties of water in the dextran hydrogels. We found there were three kinds of water in the physically crosslinked dextran hydrogels: free water, freezing bound water, and nonfreezing water. The maximum amount of nonfreezing water in the 50% dextran hydrogel was about 8%. Both 13C-NMR and 17O-NMR spectra proved that KCl played the crosslinking role and it interacted with dextran via the oxygen atoms linked to C4 and C6 and, also, the oxygen atom linked to C1 on the dextran ring. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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