WtF-Nano One-Pot Dewatering and Water-Free Topochemical Modification of Nanocellulose in Ionic Liquids or γ-Valerolactone
| Autor: | Daniel Rico del Cerro, Jussi Helminen, Michael Hummel, Tia Kakko, Laura Lemetti, Antti H. Rantamäki, Marianna Kemell, Jesper Långbacka, Ilari Filpponen, Sami Heikkinen, Alistair W. T. King, Tiina Laaksonen, Susanne K. Wiedmer, Ilkka Kilpeläinen |
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| Přispěvatelé: | Department of Chemistry, Susanne Wiedmer / Principal Investigator, HUS Head and Neck Center |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
HOMOGENIZATION
Scanning electron microscope General Chemical Engineering SUSPENSIONS 116 Chemical sciences ta221 FIBER 02 engineering and technology Electrolyte 010402 general chemistry OXIDATION 01 natural sciences PARAMETERS Nanocellulose topochemistry ionic liquids chemistry.chemical_compound DISSOLUTION nanofibers Environmental Chemistry Organic chemistry General Materials Science Cellulose ta216 Dissolution CORRELATION SPECTRA acetylation Full Paper PULP NANOFIBRILLATED CELLULOSE Solvation Full Papers 021001 nanoscience & nanotechnology 6. Clean water cellulose 0104 chemical sciences General Energy chemistry Kraft process Chemical engineering NMR-SPECTROSCOPY Ionic liquid 0210 nano-technology |
| Zdroj: | Chemsuschem Laaksonen, T, Helminen, J K J, Lemetti, L, Långbacka, J, Rico del Cerro, D, Hummel, M, Filpponen, I, Rantamäki, 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 Γ-Valerolactone ', ChemSusChem, vol. 10, no. 24, pp. 4879-4890 . https://doi.org/10.1002/cssc.201701344 |
| ISSN: | 1864-5631 |
| DOI: | 10.1002/cssc.201701344 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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