One-sided surface modification of cellulose fabric by printing a modified TEMPO-mediated oxidant.
One-sided surface oxidation of lyocell type cellulose fabric can be achieved by use of a modified TEMPO-mediated oxidation system. A borate-based buffer was used to maintain stable pH conditions and screen printing was applied to achieve oxidation on the fabric surface only. To formulate an applicable procedure, the TEMPO/NaBr/NaOCl system was split into two treatment steps: firstly, the fabric was impregnated with a buffered TEMPO/NaBr solution and dried, then a thickened NaOCl paste was printed on the fabric. FTIR-ATR spectra and methylene blue sorption experiments demonstrated successful modification on the printed side of the fabric. Substantial increases in carboxylic group content and water retention value were observed. The higher concentration of carboxylic groups on the fabric surface also led to a localised increase in binding capacity for Ca(2+)-ions. This new concept permits controlled oxidation of cellulose surfaces by printing techniques.
Research Institute of Textile Chemistry and Textile Physics, University of Innsbruck, Hoechsterstrasse 73, A-6850 Dornbirn, Austria(1).
Christa
C
Fitz-Binder
Research Institute of Textile Chemistry and Textile Physics, University of Innsbruck, Hoechsterstrasse 73, A-6850 Dornbirn, Austria(1). Electronic address: Thomas.Bechtold@uibk.ac.at.
Thomas
T
Bechtold
D001965:Bromides / Q000737:chemistry; D002482:Cellulose / Q000737:chemistry*; D032561:Cotton Fiber; D003497:Cyclic N-Oxides / Q000737:chemistry*; D016877:Oxidants / Q000737:chemistry*; D010084:Oxidation-Reduction; D011327:Printing; D017670:Sodium Compounds / Q000737:chemistry; D012973:Sodium Hypochlorite / Q000737:chemistry; D013054:Spectrophotometry, Atomic; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013784:Textiles
D001965:Bromides; D003497:Cyclic N-Oxides; D016877:Oxidants; D017670:Sodium Compounds; D002482:Cellulose; D012973:Sodium Hypochlorite; C027938:sodium bromide; C003959:TEMPO
Carboxylic groups; Cellulose; Methylene blue; Printing; TEMPO oxidation