Journal
CARBOHYDRATE POLYMERS
Volume 68, Issue 1, Pages 122-127Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2006.07.018
Keywords
chitosan fibers; N-acylation; N-acylchitosan fibers; carboxylic anhydrides; chemical structure transition
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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. (c) 2006 Elsevier Ltd. All rights reserved.
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