Innovative Concepts for the Shaping and Modification of Cellulose

Liebert, Tim

doi:10.1002/masy.200850204

Cited by 32 publications

(19 citation statements)

References 29 publications

(24 reference statements)

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“…However, some studies have addressed the possibility of covalent attachment of the IL to the cellulosic substrate. Ebner et al (2008) and Liebert (2008) reported the formation of imidazole glycosides when cellulose was reacted with alkyl imidazolum ionic liquids. Köhler et al (2007) reported the acetylation of cellulose in [C2mim]OAc in the presence of the acylating agent 2-furoyl chloride.…”

Section: Introductionmentioning

confidence: 98%

The undesirable acetylation of cellulose by the acetate ion of 1-ethyl-3-methylimidazolium acetate

2011

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The ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([C2mim]OAc) is considered to be an inert solvent of cellulose and lignocellulosic biomass. Acetylation (1.7% mol, or DS 0.017) of cellulose after dissolution in technical grade [C2mim]OAc (150°C for 20 min), is demonstrated by compositional analysis, FTIR analysis and 13 C NMR spectroscopy (in [C2mim]OAc with 13 C enriched acetate). This acetylation, in the absence of added acylating agents, has not been reported before and may limit [C2mim]OAc utility in industrial scale biomass processing, even at this low extent. For example, cellulose acetylation may contribute to IL loss in processes where the IL is recovered and reused and inhibit enzyme saccharification of cellulose in lignocellulosic biofuel production processes based on saccharification and fermentation.

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Section: Introductionmentioning

confidence: 98%

The undesirable acetylation of cellulose by the acetate ion of 1-ethyl-3-methylimidazolium acetate

2011

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“…Some of the most common cations are imidazolium, pyridinium, ammonium, and phosphonium derivatives [16]. Although imidazolium-based ILs are known to form covalent bonds with cellulose in some cases [17,18], they are still among the most used in academic research on ILs and cellulose and still highly interesting for biomass processing [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of methylimidazole on cellulose/ionic liquid solutions and regenerated material therefrom

et al. 2014

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Cellulose, especially wood-based cellulose, is increasingly important for making everyday materials such as man-made-regenerated textile fibers, produced via dissolution and subsequent precipitation. In this paper, the effect of cosolvents in ionic liquid-facilitated cellulose dissolution is discussed. Both microcrystalline cellulose and dissolving grade hardwood pulp were studied. Three different cosolvents in combination with ionic liquid were evaluated using turbidity measurements and viscosity. The ionic liquid precursor N-methylimidazole proved to be a promising cosolvent candidate and was thus selected for further studies together with the ionic liquid 1-ethyl-3-methylimidazolium acetate. Results show that dissolution rate can be increased by cosolvent addition, and the viscosity can be significantly reduced. The solutions were stable over time at room temperature and could be converted to regenerated textile fibers with good mechanical properties via airgap spinning and traditional wet spinning.Fibers spun from binary solvents exhibited significantly higher crystallinity than the fibers from neat ionic liquid.

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“…First NMR experiments of the cellodextrines dissolved in ionic liquids such as 1-ethyl-3-methylimidazolium acetate are described in ref. [25] . The results indicating a reaction of the solvent molecule with the reducing end group of the cellooligomer.…”

Section: Resultsmentioning

confidence: 95%

Efficient Method for the Preparation of Pure, Water‐Soluble Cellodextrines

Liebert

Seifert

Heinze

2008

Macromolecular Symposia

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Summary: An efficient method towards water soluble cellodextrine mixtures is described and detailed information on structure analysis is given. For cellulose degradation in good yield, treatment of cellulose with 85% phosphoric acid for 30 minutes at room temperature and a hydrolysis of 20 hours at 55 8C are suitable. With a work up in tetrahydrofuran (THF), a yield of almost 70% raw product is achievable. After separation of a water insoluble fraction, a yield of 53% of cellodextrines with a degree of polymerization (mean weight average, DP w ) of 7.5 and a polydispersity index of 1.7 is obtained. These cellodextrines are soluble in water, dimethyl sulfoxide (DMSO) and dimethyl acetamide (DMA)/LiCl. Detailed structure analysis by one and two-dimensional NMR, FTIR and mass spectroscopy revealed that the substance consists only of b-1 ! 4 linked glucoses. A partial functionalization was excluded by 13 C NMR-and 31 P decoupled 1 H NMR spectroscopy.

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Innovative Concepts for the Shaping and Modification of Cellulose

Cited by 32 publications

References 29 publications

The undesirable acetylation of cellulose by the acetate ion of 1-ethyl-3-methylimidazolium acetate

The undesirable acetylation of cellulose by the acetate ion of 1-ethyl-3-methylimidazolium acetate

Effect of methylimidazole on cellulose/ionic liquid solutions and regenerated material therefrom

Efficient Method for the Preparation of Pure, Water‐Soluble Cellodextrines

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