Layered structures of hydrophobically modified chitosan derivatives
Layered structures of hydrophobically modified chitosan derivatives
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疏水改性壳聚糖衍生物的层状结构
DOI：
10.1016/j.carbpol.2005.10.010
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发表时间：
2006
影响因子：
11.2
通讯作者：
K. Sakurai
中科院分区：
文献类型：
--
作者：
Yusong Wu;T. Seo;Takashi Sasaki;S. Irie;K. Sakurai
通过区域选择性反应，合成了N-脂肪酰基壳聚糖（Cn-CS）和N-脂肪族-O-二肉桂酰基壳聚糖（Cn-CinCS）两个系列（n=2，4，8，12和18）。用FTIR和X射线衍射技术研究了其固态结构。发现在Cn-CS和Cn-CinCS粉末样品中存在两种不同类型的层状结构。Cn-CS系列结晶为片状结构，其中所有柔性侧链在垂直于主链的方向上位于片状结构中，并且部分相互交叉。对于Cn-CinCS系列，极性骨架堆叠成薄片，柔性侧链沿倾斜于骨架的方向占据薄片之间的空间。讨论了结构与溶解度之间的关系。
Two series of chitosan derivatives, N-aliphatic acyl chitosans (Cn-CS) and N-aliphatic-O-dicinnamoyl-chitosans (Cn-CinCS) with n=2, 4, 8, 12 and 18, were prepared through regioselective reactions. The solid state structures were studied by FTIR and X-ray diffraction techniques. Two different types of layered structures were found to exist in the powder samples of Cn-CS and Cn-CinCS. The Cn-CS series crystallized into a sheet-type structure, in which all the flexible side chains lied down in the sheet in a direction normal to the backbones and partially interdigitated with each other. For the Cn-CinCS series, the polar backbones were stacked into sheets, and the flexible side chains occupied the space between sheets in a direction inclined to the backbones. The relationship between the structures and the solubilities are discussed.