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

建立了通过在纤维素和甲壳素纳米晶须表面接枝聚乙二醇（PEG）进行空间位阻稳定的方法。所得到的PEG接枝的纳米晶须是完全稳定的，在各种pH值和电解质的存在下，没有聚集。这些纳米晶须的表面羧化，即制备的重要中间步骤之一，使用各种固体支撑的氧化剂分子实现，使得氧化剂的容易回收和再利用成为可能。作为纳米晶须的实际应用，我们成功地制备了纳米晶须增强的纳米复合PVA纤维和纳米复合水凝胶，它们的模量和强度都得到了提高。

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.