Swelling and dissolution mechanism of lyocell fiber in aqueous alkaline solution containing ferric tartaric acid complex

Autor: Thomas Bechtold, Hai Vu-Manh, Hale Bahar Öztürk
Rok vydání: 2010
Předmět:
Zdroj: Cellulose. 17:521-532
ISSN: 1572-882X
0969-0239
Popis: 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.
Databáze: OpenAIRE
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