Swelling and dissolution mechanism of lyocell fiber in aqueous alkaline solution containing ferric tartaric acid complex Vu-Manh H., Ozturk H.B., Bechtold T. Research Institute of Textile Chemistry and Textile Physics, University of Innsbruck, Hoechsterstrasse 73, 6850 Dornbirn, Austria; Member of European Polysaccharide Network of Excellence (EPNOE); Faculty of Textile-Garment Technology and Fashion Design, Hanoi University of Technology, Hanoi, Viet Nam Abstract: Swelling properties of lyocell fibers in FeTNa (ferric tartaric acid complex) solutions were studied. Concentrations of Fe and free NaOH in FeTNa were varied, while the ratio between FeCl3. 6H2O: tartaric acid was kept constant as 1:3.28. The concentration of Fe ion varied from 0.15 to 0.55 M. The free NaOH concentration in FeTNa solutions was chosen as 0.4; 0.8; 1.25; 2.5 and 5 M. Fiber diameter measurements following 2 min of swelling and swelling rate of lyocell fiber up to 60 min were studied. Depending on concentration of Fe and free NaOH in FeTNa solutions and fiber swelling time; swelling, dissolution, disintegration or dramatic swelling were observed. 0.4 and 5 M free NaOH containing FeTNa solutions could only swell the fiber but could not dissolve it. 2.5 M free NaOH containing FeTNa solutions dissolved the fiber in a few minutes. FeTNa solutions containing free NaOH concentration from 0.8 to 1.25 M resulted in either dissolution or limited swelling depending on Fe concentration. © 2010 Springer Science+Business Media B.V. Author Keywords: Cellulose; FeTNa; Fiber; Iron complex; Lyocell; Swelling Index Keywords: Aqueous alkaline solutions; Concentration of fe; Dissolution mechanism; Fiber diameters; Fiber swelling; Iron complex; Lyocell; Lyocell fiber; Lyocells; NaOH concentration; Swelling properties; Swelling rates; Tartaric acids; Acids; Cellulose; Concentration (process); Dissolution; Iron compounds; Metal recovery; Swelling; Textile fibers; Solution mining; Acids; Cellulose; Concentration; Dissolving; Fibers; Iron Compounds; Swelling; Textile Fibers; cellulose; chemical modification; concentration; dissolution; fiber diameter; iron; lyocell fiber; swelling Year: 2010 Source title: Cellulose Volume: 17 Issue: 3 Page : 521-532 Cited by: 2 Link: Scorpus Link Correspondence Address: Bechtold, T.; Research Institute of Textile Chemistry and Textile Physics, University of Innsbruck, Hoechsterstrasse 73, 6850 Dornbirn, Austria; email: textilchemie@uibk.ac.at ISSN: 9690239 CODEN: CELLE DOI: 10.1007/s10570-010-9404-z