Steric Stabilization of colloids ofPolysaccharide Nanowhiskers by Grafting Polymer Brushes and Preparation of Novel Nanocomposites

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Methods for steric stabilizations of cellulose and chitin nanowhiskers by grafting of PEG on their surface were established. The obtained PEG-grafted nanowhiskers were completely stable without aggregation under the various pH and in the presence of electrolytes. Surface carboxylation of these nanowhiskers, i.e. one of the significant intermediate steps of the preparations, was achieved using various solid-supported oxidant molecules, enabling facile recovery andreuse of the oxidants. As practical applications of nanowhiskers, nanocomposite PVA fibers and nanocomposite hydrogels, which were reinforced with nanowhisker fillers, weresuccessfully prepared, indicating improved modulus and strength.