Depolymerization during nitroxide‐mediated oxidation of native cellulose |
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| Authors: | Miloslav Milichovsky Tomáš Sopuch Jaroslav Richter |
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| Affiliation: | 1. Department of Wood, Pulp and Paper, Faculty of Chemical Technology, University of Pardubice, Studentska 95, CZ 530 09 Pardubice, Czech Republic;2. Synthesia a.s., Pardubice‐Semtín, Czech Republic;3. VUOS a.s., Pardubice–Rybitví, Czech Republic |
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| Abstract: | The kinetics and mechanism of depolymerization during nitroxide‐mediated oxidation of native cellulose has been studied under various conditions. The physical heterogeneity of the native cellulose and its complicated hypermolecular and supramolecular structure exerts a remarkable influence on the kinetics of oxidation and depolymerization. A strong influence of external tension applied on cellulose gauze reactivity during its oxidation has been proven, which is caused by its complicated hypermolecular structure. Celluloronic acids were obtained by the application of external tension during selective oxidation of native cellulose textiles. The cellouronic acids contained the higher amount of carboxyl groups but they also had a lower intrinsic viscosity, i.e., the average degree of polymerization (DP). The mathematical model—so‐called DP‐peeling off model—has been derived to describe the kinetics of cellulose depolymerization based on experimental data obtained. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007 |
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| Keywords: | cellulose aging cellouronic acid oxidized cellulose degradation nitroxide oxidation |
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