Cationically modified 6-deoxy-6-azido cellulose as a water-soluble and reactive biopolymer derivative

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Leonore Bretschneider, Andreas Koschella, Thomas Heinze
Publisher: SPRINGER
Publication year: 2015
Journal: Polymer Bulletin
Journal acronym: POLYM BULL
Volume number: 72
Issue number: 3
Start page: 473
End page: 485
Number of pages: 13
ISSN: 0170-0839
eISSN: 1436-2449


Abstract

Cellulose p-toluenesulfonic acid ester was obtained by conversion of cellulose with p-toluenesulfonic acid chloride and triethylamine in N,N-dimethylacetamide/LiCl solution. Further reaction with sodium azide afforded the corresponding 6-deoxy-6-azido cellulose with almost complete displacement of the sulfonate groups. Conversion of 6-deoxy-6-azido cellulose with carboxypropyltrimethylammonium chloride in the presence of N,N'-carbonyldiimidazole yielded 6-deoxy-6-azido cellulose-2,3-O-[4-(N,N,N-trimethylammonium)]butyrate chloride with the degree of substitution of cationic groups up to 0.24. Alternatively, conversion of 6-deoxy-6-azido cellulose with 4-bromobutyltrimethylammonium bromide in the presence of sodium hydroxide in 2-propanol slurry afforded 6-deoxy-6-azido-2,3-O-(4-trimethylammonium)butyl cellulose bromide with a DS of cationic groups up to 0.30. The resulting products are water soluble provided that the content of cationic groups is sufficiently high. Etherification was found to influence the degree of polymerization much more than esterification. Utilization of dimethyl sulfoxide and sodium hydride caused predominant polymer degradation.


Keywords

3-O-[4-(N,N,N-Trimethylammonium)]butyrate chloride, 3-O-(4-Trimethylammonium)butyl cellulose bromide, 6-Deoxy-6-azido-2, 6-Deoxy-6-azido cellulose, Cationization, Cellulose p-toluenesulfonic acid ester, NMR spectroscopy, SEC

Last updated on 2020-04-06 at 05:13