Starch Phosphate Hydrogels. Part I: Synthesis by Mono‐phosphorylation and Cross‐linking of Starch |
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Authors: | Lars Passauer Falk Liebner Klaus Fischer |
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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 (DSP) of the resulting MSMP were determined using a photometric method. For structural characterization of starch phosphates 31P 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. |
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Keywords: | Starch phosphates NMR Cross‐linking Hydrogels Free swelling capacity |
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