Thermostability of imidazolium ionic liquids as direct solvents for cellulose

Wendler, Frank; Todi, Loredana-Nicoleta; Meister, Frank

doi:10.1016/j.tca.2011.11.015

Cited by 118 publications

(84 citation statements)

References 35 publications

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“…Thermal stability Figure 6 shows the TGA results for the pure IL, the native starch, and different starch- 79 Also, starting from about 75 °C, there was a slight weight loss immediately before the decomposition, which might be ascribed to the evaporation of impurities present in the starting materials (< 5%, mainly acetic acid, methylimidazole, and water). IL18-T55-H33 IL18-T55-H75 IL18-T65-H33 IL18-T65-H75 IL21-T55-H33 IL21-T55-H75 IL21-T65-H33 IL21-T65- T55-H33 IL18-T55-H75 IL18-T65-H33 IL18-T65-H75 IL21-T55-H33 IL21-T55-H75 IL21-T65-H33 IL21-T65-H75 Moreover, the structure and properties of the resultant films could be tailored by starch content, compression molding temperature, and/or RH used for the sample postprocessing conditioning.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Facile Preparation of Starch-Based Electroconductive Films with Ionic Liquid

Zhang

Xie

Shamshina

et al. 2017

ACS Sustainable Chem. Eng.

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Here, we discovered that starch could be straightforwardly processed into optically-transparent electroconductive films, by compression molding at a relatively mild temperature (55 °C or 65 °C), much lower than those commonly used in biopolymer melt processing (typically over 150 °C). Such significantly-reduced processing temperature was achieved with the use of an ionic liquid plasticizer, 1-ethyl-3-methylimidazolium acetate reduced the thermal decomposition temperature of starch by 30 °K, while the formulation and processing conditions did not affect the film thermal stability.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Facile Preparation of Starch-Based Electroconductive Films with Ionic Liquid

Zhang

Xie

Shamshina

et al. 2017

ACS Sustainable Chem. Eng.

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“…Kosan et al [17] investigated the properties of various ionic liquids, but the most interesting turned out to be 1-butyl-3-methyl imidazolium acetate, using which a 13.5% cellulose solution can be prepared. This liquid possesses more advantages, such as low melting point, high boiling point and good thermal stability [27]. Ding et al [25] used EMIMAc to dissolve microcrystalline cellulose, thus obtaining a 5% solution.…”

Section: Introductionmentioning

confidence: 99%

Properties and Structure of Cellulosic Membranes Obtained from Solutions in Ionic Liquids Coagulated in Primary Alcohols

Fryczkowska

Kowalska

Biniaś

et al. 2018

Autex Research Journal

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This paper presents the results of studies on the preparation of cellulosic membranes, from a solution in 1-ethyl-3- methylimidazolium acetate (EMIMAc), using the phase inversion method. Initially, the membranes were obtained by coagulation of the polymer film in water and primary alcohols (methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol), 1-hexanol, 1-octanol) resulting in membranes with significantly differing morphologies. Subsequently, composite membranes were produced, with the support layer being a membrane with the largest pores, and the skin layer a membrane with smaller pores. The resulting membranes were tested for physicochemical and transport properties. The morphology of the membrane surfaces and their cross-sections were investigated by using a scanning electron microscope (SEM). The structure of the membranes, on the other hand, was investigated by FTIR spectroscopy and WAXS structural analysis.

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“…The 1 H and 13 C NMR investigations of the deactivated EMIMAc mixture showed the presence of several imidazolium species. Imidazolium-based ILs are known to degrade via several pathways, including dealkylation, hydrolysis, and rearrangements, all of which are highly influenced by other reaction additives [44,45]. Although the deactivation pathways remain elusive, it can be circumvented by using the pure methanol workup. )…”

Section: Resultsmentioning

confidence: 99%

Ionic Liquids as Carbene Catalyst Precursors in the One-Pot Four-Component Assembly of Oxo Triphenylhexanoates (OTHOs)

Axelsson

Sundén

2015

Catalysts

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Ionic liquids (ILs) are a convenient and inexpensive source of N-heterocyclic carbenes (NHCs). In this study, dialkyl imidazolium-based ILs are used as carbene precursors in a four-component synthesis of oxo triphenylhexanoates (OTHOs), where it was found that IL outperformed commonly used NHC precatalysts in terms of reaction efficiency. The reaction is highly stereoselective, delivering the anti-diastereomer (20:1 dr), and the OTHOs can be obtained in high-to-excellent yields. By virtue of the four-component reaction-setup, facile construction of the OTHO scaffold with a diverse set of functional groups (21 examples) can be achieved. In the context of sustainability, the IL can be recovered and reused several times without affecting selectivity or yield. Moreover, most compounds can be isolated by precipitation and filtration, mitigating the use of solvent-demanding chromatography.

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Thermostability of imidazolium ionic liquids as direct solvents for cellulose

Cited by 118 publications

References 35 publications

Facile Preparation of Starch-Based Electroconductive Films with Ionic Liquid

Facile Preparation of Starch-Based Electroconductive Films with Ionic Liquid

Properties and Structure of Cellulosic Membranes Obtained from Solutions in Ionic Liquids Coagulated in Primary Alcohols

Ionic Liquids as Carbene Catalyst Precursors in the One-Pot Four-Component Assembly of Oxo Triphenylhexanoates (OTHOs)

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