title: Rapid determination of γ-value and xanthate group distribution on viscose by liquid-state (1)H NMR spectroscopy.
abstract: A method for the determination of the γ-value and more importantly the distribution of xanthate groups on cellulose xanthate produced during the viscose process is presented. The method is based upon stabilization of xanthate groups attached to the cellulose chain by reaction with 4-methylbenzyl bromide and analysis of the resulting product by liquid-state (1)H NMR. Careful analysis of the proton-spectrum using deconvolution gave a very fast method for the measurement of the γ-value which compared well with the data obtained by IR spectroscopy. In addition it could be shown that the distribution of the xanthate groups on the anhydroglucose monomeric unit (xanthation at position 2, 3 or 6) changes significantly during ripening. The method gave useful results even for viscose with low γ-values of about 25.
authors.affiliation: Kompetenzzentrum Holz GmbH, Altenberger Straße 69, 4040 Linz, Austria; Institut für Organische Chemie, TU Graz, Stremayrgasse 9, 8010 Graz, Austria.
authors.forename: Kateryna
authors.initials: K
authors.lastname: Wöss
authors.affiliation: Institut für Organische Chemie, TU Graz, Stremayrgasse 9, 8010 Graz, Austria.
authors.forename: Hansjörg
authors.initials: H
authors.lastname: Weber
authors.affiliation: Lenzing AG, Werkstrasse 2, 4860 Lenzing, Austria.
authors.forename: Peter
authors.initials: P
authors.lastname: Grundnig
authors.affiliation: Lenzing AG, Werkstrasse 2, 4860 Lenzing, Austria.
authors.forename: Thomas
authors.initials: T
authors.lastname: Röder
authors.affiliation: Kompetenzzentrum Holz GmbH, Altenberger Straße 69, 4040 Linz, Austria. Electronic address: h.weber@kplus-wood.at.
authors.forename: Hedda K
authors.initials: HK
authors.lastname: Weber
mesh_terms: D001593:Benzyl Compounds / Q000737:chemistry; D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D014970:Xanthines / Q000737:chemistry*
chemical_list: D001593:Benzyl Compounds; D014970:Xanthines; C528876:cellulose xanthate; D002482:Cellulose; C012024:rayon, purified
keywords: (1)H NMR; Viscose; Xanthate group distribution; γ-Value