Rapid determination of γ-value and xanthate group distribution on viscose by liquid-state 1H NMR spectroscopy

被引：4

作者：

Woess, Kateryna ^{[1
,2
]}

Weber, Hansjoerg ^{[2
]}

Grundnig, Peter ^{[3
]}

Roeder, Thomas ^{[3
]}

Weber, Hedda K. ^{[1
]}

机构：

[1] Kompetenzzentrum Holz GmbH, Altenberger Str 69, A-4040 Linz, Austria

[2] Graz Univ Technol, Inst Organ Chem, Stremayrgasse 9, A-8010 Graz, Austria

[3] Lenzing AG, Werkstr 2, A-4860 Lenzing, Austria

来源：

CARBOHYDRATE POLYMERS | 2016年 / 141卷

关键词：

Viscose; gamma-Value; Xanthate group distribution; H-1; NMR; C-13; NMR-SPECTRUM; MONOMER COMPOSITION; ACID DISSOCIATION; MODELS;

D O I：

10.1016/j.carbpol.2016.01.004

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A method for the determination of the gamma-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 H-1 NMR. Careful analysis of the proton-spectrum using deconvolution gave a very fast method for the measurement of the gamma-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 gamma-values of about 25. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：184 / 189

页数：6

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