Journal
CELLULOSE
Volume 18, Issue 5, Pages 1201-1212Publisher
SPRINGER
DOI: 10.1007/s10570-011-9573-4
Keywords
Nanofibrillated cellulose; NFC; Cellulose; Nanofibrils; Click chemistry; Surface functionalization; Modification of polysaccharides
Funding
- Graduate School for Biomass Refining (Academy of Finland)
- Finnish Funding Agency for Technology and Innovation
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In the present work, amino functionalized nanofibrillated cellulose (NFC) was prepared using click-chemistry in aqueous reaction conditions. First, reactive azide groups were introduced on the surface of NFC by the etherification of 1-azido-2,3-epoxypropane in alkaline water/isopropanol-mixture at ambient temperature. Then the azide groups were reacted with propargyl amine utilizing copper catalyzed azide-alkyne cycloaddition (CuAAC), leading to pH-responsive 1,2,3-triazole-4-methanamine decorated NFC. The reaction products were characterized using Fourier transform infrared spectroscopy, elemental analysis and X-ray photoelectron spectroscopy. The presence of the attached azide groups was also confirmed by reacting them with 5-(dimethylamino)-N-(2-propyl)-1-naphthalenesulfonamide by CuAAC, yielding highly fluorescent NFC. In addition, atom force microscopy and rheology studies confirmed that the original NFC nanostructure was maintained during the synthesis.
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