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Title of article :
Effect of N-acylation on structure and properties of chitosan fibers
Author/Authors :
Choi، نويسنده , , Choong Youl and Kim، نويسنده , , Su Bong and Pak، نويسنده , , Pyong Ki and Yoo، نويسنده , , Dong Il and Chung، نويسنده , , Yong Sik، نويسنده ,
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روزنامه با شماره پیاپی سال 2007
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Abstract :
This article described the physico-chemical transition of the chitosan fibers by N-acylation. N-Acyl chitosan fibers were prepared by a post-treatment of chitosan fibers with carboxylic anhydrides (e. q., acetic, propionic, butyric, hexanoic anhydride) in methanol at room temperature. N-Acyl chitosan fibers were analyzed by FT-IR, TGA, DSC, XRD and SEM. N-Acylation with longer hydrocarbon side chain resulted in a higher spatial organization of the chain to the long axis and showed lower moisture retention. The N-acyl chitosan fibers with short acyl chain exhibited gradually lower tensile strength. N-Hexanoyl chitosan fibers showed higher tensile strength than N-acetylated ones. The chemical structure of chitosan fibers was gradually altered from hydrated form (anti-parallel structure) to dehydrated form (parallel structure) with a treatment of carboxylic anhydrides.
Keywords :
Chitosan fibers , N-Acylchitosan fibers , N-acylation , Carboxylic anhydrides , Chemical structure transition
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