材料科学
动态光散射
壳聚糖
化学工程
两亲性
高分子
高分子化学
化学改性
反应挤出
挤压
聚合
聚合物
动态力学分析
烷基
有机化学
化学
共聚物
复合材料
纳米技术
纳米颗粒
工程类
生物化学
作者
Т. А. Акопова,Т. С. Демина,Mukhamed A. Khavpachev,Tatiana N. Popyrina,А. В. Грачев,П. Л. Иванов,А. Н. Зеленецкий
出处
期刊:Polymers
[MDPI AG]
日期:2021-08-21
卷期号:13 (16): 2807-2807
被引量:7
标识
DOI:10.3390/polym13162807
摘要
Hydrophobic derivatives of polysaccharides possess an amphiphilic behavior and are widely used as rheological modifiers, selective sorbents, and stabilizers for compositions intended for various applications. In this work, we studied the mechanochemical reactions of chitosan alkylation when interacting with docosylglycidyl and hexadecylglycidyl ethers in the absence of solvents at shear deformation in a pilot twin-screw extruder. The chemical structure and physical properties of the obtained derivatives were characterized by elemental analysis, FT-IR spectroscopy, dynamic light scattering, scanning electron microscopy, and mechanical tests. According to calculations for products soluble in aqueous media, it was possible to introduce about 5–12 hydrophobic fragments per chitosan macromolecule with a degree of polymerization of 500–2000. The length of the carbon chain of the alkyl substituent significantly affects its reactivity under the chosen conditions of mechanochemical synthesis. It was shown that modification disturbs the packing ability of the macromolecules, resulting in an increase of plasticity and drop in the elastic modulus of the film made from the hydrophobically modified chitosan samples.
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