Effect of N-acylation on structure and properties of chitosan fibers

Tipo de material: Texto

TextoSeries ; Carbohydrate Polymers, 68(1), p.122-127, 2007Trabajos contenidos:

Choi, C.Y
Kim, S.B
Pak, P.K
Yoo, D.I
Chung, Y.S

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Resumen: This article described the physico-chemical transition of the chitosan fibers by N-acylation. N-Acyl chitosan fibers were prepared by a host-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.

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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 host-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.

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