scholarly journals Interaction of the ionic liquid [BMP][TFSA] with rutile TiO2(110) and coadsorbed lithium

2016 ◽  
Vol 18 (9) ◽  
pp. 6618-6636 ◽  
Author(s):  
Benedikt Uhl ◽  
Maral Hekmatfar ◽  
Florian Buchner ◽  
R. Jürgen Behm
Keyword(s):  
Thermal Stability ◽  
Ionic Liquid ◽  
Reaction Products ◽  
Rutile Tio2 ◽  
Thermal Stability Of

The interaction of lithium, [BMP][TFSA] and their mixture with rutile TiO2(110), the thermal stability of the adlayers and the resulting reaction products are investigated under UHV conditions by STM and XPS.

scholarly journals FUNCTIONALIZATION OF CELLULOSE AND CHITOSAN IN IONIC LIQUIDS

2020 ◽  
Vol 54 (9-10) ◽  
pp. 857-868
Author(s):  
CRISTINA STEFANESCU ◽  
WILLIAM H. DALY ◽  
IOAN I. NEGULESCU
Keyword(s):  
Thermal Stability ◽  
Weight Loss ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Functional Groups ◽  
Phthalic Anhydride ◽  
Reaction Products ◽  
Molar Ratios ◽  
Thermal Stability Of ◽  
Mechanisms Of Reactions

Chemistry of cellulose in ionic liquids has been briefly reviewed and, accordingly, the phthalation of chitosan in these ionic solvents has been investigated. Chitosan (K) has been reacted at 100 °C for 4 hours with phthalic anhydride (PA) in ionic liquids 1-butyl-3-methylimidazolium acetate (BMIMAc) and 1-butyl-3-methylimidazolium chloride (BMIMCl) in the presence of bases, pyridine and 1,4-diazobicyclo[2.2.2] octane (DABCO), or the phthalation has been catalyzed by N-bromosuccinimide (NBS). Depending on the nature of the reaction components, the samples were prepared with molar ratios of PA to anhydroglucose unit (PA:K) from 3:1 to 10:1, including molar ratios of bases or catalyst to chitosan, ranging also from 3:1 to 10:1. All the reaction products were soluble in dimethyl sulfoxide and dimethylformamide. Both functional groups of chitosan units, -OH and -NH2 , reacted, resulting in FTIR confirmed products containing esters, amide, and imide functional groups. Heating the isolated phthalated chitosan products to 200 °C led to cyclization with the formation of imide groups and elimination of water. When bases controlled the reactions, the highest degrees of substitution of DABCO product (DS = 0.80) was slightly higher than the highest DC of the reaction products obtained in the presence of pyridine (DS = 0.77). However, the presence of the Nbromosuccinimide catalyst in the system led to an increase of the degree of substitution of the functional groups of chitosan (DS = 1.75), compared with that listed above for the products resulted when the reactions were carried out in the presence of bases. The thermal stability of the chitosan derivatives obtained in the presence of a base depended primarily upon the nature of the counter ion of the ionic liquid. When the reaction was conducted in the acetate ionic liquid BMIMAc, the phthalated chitosan exhibited a lower thermal stability than that of chitosan, while when the chloride ionic liquid BMIMCl was used as solvent, the thermal stability of the phthalated chitosan increased, indicating an interference of the ionic solvents in the mechanisms of reactions. Nevertheless, the thermal behavior of the phthalated products obtained in reactions catalyzed by NBS may be correlated with the increasing degrees of substitution achieved with increased catalyst concentrations: a higher DS resulted in a higher weight loss at higher temperatures.

scholarly journals Investigation of the Electrochemical and Thermal Stability of an Ionic Liquid Based Na0.6Co0.1Mn0.9O2/Na2.55V6O16 Sodium-Ion Full-Cell

2019 ◽  
Vol 166 (6) ◽  
pp. A944-A952 ◽  
Author(s):  
Minh Phuong Do ◽  
Pauline J. Fischer ◽  
Arun Nagasubramanian ◽  
Jan Geder ◽  
Fritz E. Kühn ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ionic Liquid ◽  
Sodium Ion ◽  
Full Cell ◽  
Thermal Stability Of

Vapor pressure and thermal stability of ionic liquid 1-butyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)amide

2005 ◽  
Vol 439 (1-2) ◽  
pp. 158-160 ◽  
Author(s):  
Y.U. Paulechka ◽  
Dz. H. Zaitsau ◽  
G.J. Kabo ◽  
A.A. Strechan
Keyword(s):  
Thermal Stability ◽  
Ionic Liquid ◽  
Vapor Pressure ◽  
Thermal Stability Of

Application of ionic liquid [bmim]PF6 as green plasticizer for poly(L-lactide)

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Puyu Zhang ◽  
Lichao Peng ◽  
Wenbin Li
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Ionic Liquid ◽  
Glass Transition ◽  
Transition Temperature ◽  
Poly Ethylene Glycol ◽  
Scanning Calorimetry ◽  
Poly Ethylene ◽  
Thermal Stability Of ◽  
Better Than

AbstractIonic liquid [bmim]PF6 (1-butyl-3-methylimidazolium hexafluoro phosphate) was synthesized and characterized. It was used as the plasticizer for poly(L-lactide) (PLLA). The glass transition temperature (Tg) and the thermal stability of the plasticized PLLA samples were measured by thermogravimetry (TG) and differential scanning calorimetry (DSC). Compared with poly(ethylene glycol) having Mw of 300 g/mol (PEG300), TG results showed that the thermal stability of PLLA plasticized with ionic liquid was better than that of PLLA plasticized with PEG300. The Tg of plasticized PLLA decrease with increasing the content of ionic liquid [bmim]PF6 from 2 wt.% to 10 wt.%. The Tg of PLLA can be reduced to 40°C when the content of ionic liquid [bmim]PF6 was 10 wt.%. The materials of PLLA with plasticizer were also investigated using polarizing microscope (POM), the results of which indicate that the movements of PLLA chains were improved when ionic liquid plasticizer was used.

scholarly journals Enhancing the Thermal Stability of Ionogels: Synthesis and Properties of Triple Ionic Liquid/Halloysite/MCC Ionogels

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6198
Author(s):  
Olga V. Alekseeva ◽  
Valeriya D. Shibaeva ◽  
Andrew V. Noskov ◽  
Vladimir K. Ivanov ◽  
Alexander V. Agafonov
Keyword(s):  
Thermal Stability ◽  
Ionic Liquid ◽  
Glass Transition ◽  
Mechanical Characteristics ◽  
Interlayer Space ◽  
Xrd Analysis ◽  
Mechanical Tests ◽  
Water Molecules ◽  
Residual Water ◽  
Thermal Stability Of

In this study, an ionic liquid (IL), 1-butyl-3-methylimidazolium acetate, was used to prepare ionogels with microcrystalline cellulose (MCC) and halloysite (Hal). SEM, XRD, TG, DSC, FTIR spectroscopy, conductometry and mechanical tests were used to study the morphology, structure, thermal behaviour and electrophysical and mechanical characteristics of synthesised ionogels. XRD analysis showed a slight decrease in the interlayer space of halloysite in ionogels containing MCC, which may have been associated with the removal of residual water molecules resulting from hydrophilic IL anions and polymer macromolecules. A change in conductivity and glass-transition temperature of the ionic liquid was revealed due to intercalation into halloysite (a confinement effect) and modification with cellulose. For triple IL/Hal/MCC ionogels, the characteristic thermal degradation temperatures were higher than the corresponding values for IL/Hal composites. This indicates that the synthesised IL/Hal/MCC ionogels are characterised by a greater thermal stability than those of IL/Hal systems.

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