乙酰化处理对含银甲壳胺纤维性能的影响

为改善含银甲壳胺纤维释放银离子的性能,用乙酸酐处理甲壳胺纤维后使纤维中的氨基转换成乙酰胺基,从而减弱纤维对银离子的结合力。比较了未处理纤维和几种不同取代度乙酰化甲壳胺纤维的吸水性及其释放银离子的性能。结果表明,乙酰化处理破坏了甲壳胺纤维的有序结构,使水分更容易进入纤维结构,部分乙酰化的甲壳胺纤维具有很高的吸水性能。由于乙酰化处理使自由氨基转换成乙酰胺基,随着乙酰化度的提高,处理后的甲壳胺纤维在遇水湿润后可释放出更多的银离子。

Influence of acetylation treatment on properties of silver containing chitosan fibers

In order to improve the silver releasing properties of chitosan fibers, acetic anhydride was used to modify chitosan fibers for converting the amine groups of fibers into acetamide groups, and consequently decreasing the binding force between the fiber and silver ions. The water absorption and silver releasing properties of the original and acetylated samples were compared. The experimental results showed that the ordered structure of chitosan dibers were damaged by the acetylation treatment, leading to easy penertration of water into the fibers. The partially acetylated chitosan fiber showed a high absorption capacity.Owing to the conversion of free amine groups into acetamide groups, the acetylated fibers can release more silver ions  with the increase in the degree of acetylation when wetting.