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Starch Phosphate Hydrogels. Part I: Synthesis by Mono‐phosphorylation and Cross‐linking of Starch
Author(s) -
Passauer Lars,
Liebner Falk,
Fischer Klaus
Publication year - 2009
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.200900168
Subject(s) - self healing hydrogels , starch , swelling , phosphate , chemistry , citric acid , succinic acid , sodium , polymer , phosphorus , nuclear chemistry , polymer chemistry , biochemistry , chemical engineering , organic chemistry , engineering
Abstract Starch‐based hydrogels were synthesized by cross‐linking monostarch monophosphates (MSMP) with different di‐ and tricarboxylic acids such as succinic, adipic or citric acid. Phosphorylation of starch was performed in a semi‐dry process using a mixture of primary and secondary sodium phosphates. The phosphorus content and degree of substitution of phosphate groups (DS P ) of the resulting MSMP were determined using a photometric method. For structural characterization of starch phosphates 31 P NMR was used. Investigations showed that MSMP hydrogels were strong water absorbing polymer networks with a free swelling capacity (FSC) of up to 185 g water / g dry hydrogel.