Synthesis of alkaline-soluble cellulose methyl carbamate using a reactive deep eutectic solvent
Sirviö, Juho Antti; Heiskanen, Juha P. (2016-11-15)
Sirviö, J., Heiskanen, J. (2016) Synthesis of Alkaline-Soluble Cellulose Methyl Carbamate Using a Reactive Deep Eutectic Solvent. ChemSusChem, 10 (2), 455-460. doi:10.1002/cssc.201601270
© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Sirviö, J., Heiskanen, J. (2016) Synthesis of Alkaline-Soluble Cellulose Methyl Carbamate Using a Reactive Deep Eutectic Solvent. ChemSusChem, 10 (2), 455-460, which has been published in final form at https://doi.org/10.1002/cssc.201601270. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe201902276486
Tiivistelmä
Abstract
This study presents the use of a reactive deep eutectic solvent (DES) for the chemical modification of wood cellulose fibers. DES based on dimethylurea and ZnCl2 was used to synthetize cellulose methyl carbamate (CMeC). This synthesis was performed at elevated temperature under solvent‐free conditions. Chemical characterization based on FTIR and NMR indicated that methyl carbamate was successfully introduced to cellulose, and a degree of substitution (DS) of 0.17 was obtained after 3 h of reaction at 150 °C. The product with a DS of 0.17 exhibited good alkaline solubility (in 3 % NaOH solution) after freeze‐thawing, whereas the original cellulose fibers were practically insoluble even in 9 % NaOH. As dimethylurea can be produced from CO2, this method can be used as a sustainable way to obtain novel cellulose materials with desirable properties for use in a wide range of applications.
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