Abstract
To improve the solubility of cellulose at lower temperatures, several polar organic solvents were examined as cosolvents in imidazolium ionic liquid (IL). All tested cosolvents increased the solubilization efficiency of ILs at lower temperatures. Among these, N-methylimidazole, N-methyl-2-pyrrolidone, and dimethyl sulfoxide (DMSO) were notably efficient; in case of Avicel the solubility was increased, with 12–15% cellulose dissolution in 1-allyl-3-methylimidazolium chloride ([Amim]Cl) at 30°C. IR spectra of the regenerated celluloses from IL/cosolvent systems showed characteristic features of cellulose II and/or amorphous cellulose. Thermogravimetric analyses showed significantly higher thermal stability of regenerated cellulose from [Amim]Cl/DMSO compared with that without DMSO. Moreover, dimethylacetamide (DMAc) increased the solubility of filter paper pulp in 1-ethyl-3-methylimidazolium acetate ([Emim]OAc), with 12% pulp dissolution at 30°C. No decrease in the degree of polymerization (DP) of cellulose was observed with [Emim]OAc/DMAc, whereas 8–9% DP decrease was observed with [Emim]OAc, even at 30°C. These results indicate that some cosolvents including DMSO and DMAc increase solubilization efficiency and have superior cellulose-protective effects during enhanced dissolution in ILs.
Acknowledgments
Part of this work was supported by JSPS KAKENHI Grant 25292106.
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©2016 by De Gruyter
Articles in the same Issue
- Frontmatter
- Original Articles
- Elucidation of LCC bonding sites via γ-TTSA lignin degradation: crude milled wood lignin (MWL) from Eucalyptus globulus for enrichment of lignin xylan linkages and their HSQC-NMR characterization
- The impact of ionic strength on the molecular weight distribution (MWD) of lignin dissolved during softwood kraft cooking in a flow-through reactor
- Distinction of four Dalbergia species by FTIR, 2nd derivative IR, and 2D-IR spectroscopy of their ethanol-benzene extractives
- Content and distribution of lignans in Taiwania cryptomerioides Hayata
- Superior cellulose-protective effects of cosolvent during enhanced dissolution in imidazolium ionic liquid
- Hydrophobisation of wood surfaces by combining liquid flame spray (LFS) and plasma treatment: dynamic wetting properties
- Parametric study on the capability of three-dimensional finite element analysis (3D-FEA) of compressive behaviour of Douglas fir
- Dynamic viscoelastic properties of Chinese fir (Cunninghamia lanceolata) during moisture desorption processes
- Influence of incubation time on the vibration and mechanic properties of mycowood
- Fatigue behavior of wood-fiber-based tri-axial engineered sandwich composite panels (ESCP)
- Covalent fixation of boron in wood through transesterification with vinyl ester of carboxyphenylboronic acid
- Effect of fungal competition on decay rates in bicultured soil bottle assays
Articles in the same Issue
- Frontmatter
- Original Articles
- Elucidation of LCC bonding sites via γ-TTSA lignin degradation: crude milled wood lignin (MWL) from Eucalyptus globulus for enrichment of lignin xylan linkages and their HSQC-NMR characterization
- The impact of ionic strength on the molecular weight distribution (MWD) of lignin dissolved during softwood kraft cooking in a flow-through reactor
- Distinction of four Dalbergia species by FTIR, 2nd derivative IR, and 2D-IR spectroscopy of their ethanol-benzene extractives
- Content and distribution of lignans in Taiwania cryptomerioides Hayata
- Superior cellulose-protective effects of cosolvent during enhanced dissolution in imidazolium ionic liquid
- Hydrophobisation of wood surfaces by combining liquid flame spray (LFS) and plasma treatment: dynamic wetting properties
- Parametric study on the capability of three-dimensional finite element analysis (3D-FEA) of compressive behaviour of Douglas fir
- Dynamic viscoelastic properties of Chinese fir (Cunninghamia lanceolata) during moisture desorption processes
- Influence of incubation time on the vibration and mechanic properties of mycowood
- Fatigue behavior of wood-fiber-based tri-axial engineered sandwich composite panels (ESCP)
- Covalent fixation of boron in wood through transesterification with vinyl ester of carboxyphenylboronic acid
- Effect of fungal competition on decay rates in bicultured soil bottle assays