WtF-Nano : One-Pot Dewatering and Water-Free Topochemical Modification of Nanocellulose in Ionic Liquids or gamma-Valerolactone

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Laaksonen , T , Helminen , J K J , Lemetti , L , Långbacka , J , del Cerro , D R , Hummel , M , Filpponen , I , Rantamaki , A H , Kakko , T , Kemell , M L , Wiedmer , S K , Heikkinen , S , Kilpeläinen , I & King , A W T 2017 , ' WtF-Nano : One-Pot Dewatering and Water-Free Topochemical Modification of Nanocellulose in Ionic Liquids or gamma-Valerolactone ' , ChemSusChem , vol. 10 , no. 24 , pp. 4879-4890 . https://doi.org/10.1002/cssc.201701344

Title: WtF-Nano : One-Pot Dewatering and Water-Free Topochemical Modification of Nanocellulose in Ionic Liquids or gamma-Valerolactone
Author: Laaksonen, Tiina; Helminen, Jussi K. J.; Lemetti, Laura; Långbacka, Jesper; del Cerro, Daniel Rico; Hummel, Michael; Filpponen, Ilari; Rantamaki, Antti H.; Kakko, Tia; Kemell, Marianna L.; Wiedmer, Susanne K.; Heikkinen, Sami; Kilpeläinen, Ilkka; King, Alistair W. T.
Other contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry


Date: 2017-12-22
Language: eng
Number of pages: 12
Belongs to series: ChemSusChem
ISSN: 1864-5631
DOI: https://doi.org/10.1002/cssc.201701344
URI: http://hdl.handle.net/10138/231734
Abstract: Ionic liquids are used to dewater a suspension of birch Kraft pulp cellulose nanofibrils (CNF) and as a medium for water-free topochemical modification of the nanocellulose (a process denoted as "WtF-Nano"). Acetylation was applied as a model reaction to investigate the degree of modification and scope of effective ionic liquid structures. Little difference in reactivity was observed when water was removed, after introduction of an ionic liquid or molecular co-solvent. However, the viscoelastic properties of the CNF suspended in two ionic liquids show that the more basic, but non-dissolving ionic liquid, allows for better solvation of the CNF. Vibrio fischeri bacterial tests show that all ionic liquids in this study were harmless. Scanning electron microscopy and wide-angle X-ray scattering on regenerated samples show that the acetylated CNF is still in a fibrillar form. 1D and 2D NMR analyses, after direct dissolution in a novel ionic liquid electrolyte solution, indicate that both cellulose and residual xylan on the surface of the nanofibrils reacts to give acetate esters.
Subject: acetylation
ionic liquids
cellulose
nanofibers
topochemistry
NANOFIBRILLATED CELLULOSE
CORRELATION SPECTRA
NMR-SPECTROSCOPY
PULP
HOMOGENIZATION
DISSOLUTION
SUSPENSIONS
PARAMETERS
OXIDATION
FIBER
116 Chemical sciences
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