Fibrillation of dried chitin into 10-20 nm nanofibers by a simple grinding method under acidic conditions
Fibrillation of dried chitin into 10-20 nm nanofibers by a simple grinding method under acidic conditions
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DOI：
10.1016/j.carbpol.2010.02.006
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发表时间：
2010-05-23
影响因子：
11.2
通讯作者：
Saimoto, Hiroyuki
中科院分区：
文献类型：
--
作者：
Ifuku, Shinsuke;Nogi, Masaya;Saimoto, Hiroyuki
以干燥的甲壳素为原料，采用研磨法制备了甲壳素纳米纤维。用FE-SEM观察了原纤化的甲壳素样品，发现其具有精细的网状结构，结构高度均匀，宽度为10-20 nm，纵横比大。酸性条件下的机械处理是干燥甲壳素脱水的关键。甲壳素纤维上氨基的阳离子化通过静电排斥促进原纤化成纳米纤维。尽管氨基的取代度只有3.9%，但足以打破纳米纤维之间的强氢键。此外，将甲壳素纳米纤维与丙烯酸树脂复合，制备了光学透明的纳米复合材料，以考察干燥甲壳素的原纤化性能和分散均匀性。由于干燥的甲壳素是完全原纤化，这些复合材料的光学损耗小于2%，即使在干燥过程。并对薄膜进行了X射线衍射和热重分析。(C)2010爱思唯尔有限公司保留所有权利。
Chitin nanofibers were prepared from dried chitin by fibrillation using a grinding apparatus. The fibrillated chitin samples were observed by FE-SEM and were found to have a fine nanofiber network; the structure was highly uniform with a width of 10-20 nm and a high aspect ratio. Mechanical treatment under acidic conditions is the key to fibrillating dry chitin. The cationization of amino groups on the chitin fiber facilitates fibrillation into nanofibers by electrostatic repulsions. Even though the degree of substitution of amino groups was only 3.9%, it was enough to break the strong hydrogen bonds between the nanofibers. Furthermore, optically transparent nanocomposites using chitin nanofibers with acrylic resin were prepared to examine the fibrillation properties of dry chitin and nanofiber homogeneity. Since dried chitin was fully fibrillated, the optical losses of these composites were less than 2% even after the drying process. Moreover the films were characterized by X-ray diffraction, and TGA. (C) 2010 Elsevier Ltd. All rights reserved.