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01-02-2009

Changes in the intra- and inter-fibrillar structure of lyocell (TENCEL^®) fibers caused by NaOH treatment

Authors: Hale Bahar Öztürk, Antje Potthast, Thomas Rosenau, Mohammad Abu-Rous, Bill MacNaughtan, K. Christian Schuster, John R. Mitchell, Thomas Bechtold

Published in: Cellulose | Issue 1/2009

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Abstract

Some effects of NaOH treatment at concentrations of up to 8 M on (1) the porous structure, (2) the degree of swelling, (3) carboxyl content using methylene blue sorption and 9H-fluoren-2-yl-diazomethane (FDAM) methods, (4) dyeing, (5) the molecular weight distribution measured by gel permeation chromatography (GPC), (6) crystallinity determined by wide angle X-ray diffraction (WAXD) and (7) the tensile properties of lyocell fibers were investigated. The porous structure of fibers was visualised using fluorescence microscopy and transmission electron microscopy (TEM) on fiber cross-sections and was also studied by inversion size exclusion chromatography (ISEC). Mean pore diameter and pore area of fibers were not changed by NaOH treatments. The pore volume increased above 2.5 M NaOH. NaOH-treated samples showed higher dye uptake, higher swelling, but lower carboxyl and moisture content and increased crystallinity. As the NaOH concentration increased, the depth of colour following dyeing with C.I. Direct Red 81 also increased due to deep penetration of alkali into the fiber. In general, fiber properties were distinctly different in the ranges 0 to approximately 3 and 3–8 M NaOH.

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Title: Changes in the intra- and inter-fibrillar structure of lyocell (TENCEL®) fibers caused by NaOH treatment
Authors: Hale Bahar Öztürk
Antje Potthast
Thomas Rosenau
Mohammad Abu-Rous
Bill MacNaughtan
K. Christian Schuster
John R. Mitchell
Thomas Bechtold
Publication date: 01-02-2009
Publisher: Springer Netherlands
Published in: Cellulose / Issue 1/2009
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-008-9249-x

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