Targeted functionalization of spruce O-acetyl galactoglucomannans-2,2,6,6-tetramethylpiperidin-1-oxyl-oxidation and carbodiimide-mediated amidation
2013 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 130, no 5, 3122-3129 p.Article in journal (Refereed) Published
Modified spruce O-acetyl galactoglucomannans (GGMs) can be used as molecular anchors to alter the surface properties or to activate the surface of cellulose. To selectively introduce functionalities, GGMs were oxidized on C-6 of hexoses by 2,2,6,6-tetramethylpiperidin-1-oxyl-mediated oxidation. Different degrees of oxidation were successfully obtained by varying the reaction parameters. Low degrees could be obtained by performing the oxidations in bromide-free conditions. The formed uronic acids were further modified by a carbodiimide-mediated amidation reaction, which opens a window for introducing various functionalities selectively on hexoses. The adsorption of the modified GGMs to various cellulose samples was investigated. Indirect bulk sorption to fibers was compared to direct adsorption to nanofibrillated cellulose ultrathin films. GGMs with low degrees of oxidation showed high affinity to cellulose surfaces and could be sorbed onto cellulose in pure water. Moderate amounts of GGMs with high degree of oxidation could be sorbed onto cellulose in the presence of salts.
Place, publisher, year, edition, pages
2013. Vol. 130, no 5, 3122-3129 p.
polysaccharides, functionalization of polymers, synthesis and processing, adsorption
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-129605DOI: 10.1002/app.39528ISI: 000324097400014ScopusID: 2-s2.0-84883853593OAI: oai:DiVA.org:kth-129605DiVA: diva2:653499
FunderKnut and Alice Wallenberg Foundation
QC 201310042013-10-042013-10-032013-10-04Bibliographically approved