Synthesis and characterization of ureido-derivatized UCST-type poly(ionic liquid) microgels

2018 ◽  
Vol 9 (12) ◽  
pp. 1439-1447 ◽  
Author(s):  
Shoumin Chen ◽  
Aiping Chang ◽  
Xuezhen Lin ◽  
Zhenghao Zhai ◽  
Fan Lu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Solution Temperature ◽  
Synthesis And Characterization ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature ◽  
Poly Ionic Liquid

Ureido-derivatized poly(ionic liquid) microgels, which possess an upper critical solution temperature and can be used in catalytic esterification, are synthesized.

Synthesis and characterization of CO2-sensitive temperature-responsive catalytic poly(ionic liquid) microgels

2018 ◽  
Vol 9 (21) ◽  
pp. 2887-2896 ◽  
Author(s):  
Shoumin Chen ◽  
Xuezhen Lin ◽  
Zhenghao Zhai ◽  
Ruyue Lan ◽  
Jin Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Ionic Liquid ◽  
Synthesis And Characterization ◽  
Volume Phase Transition ◽  
Phase Transition Behavior ◽  
Volume Phase ◽  
Temperature Responsive ◽  
Transition Behavior ◽  
Poly Ionic Liquid

A class of poly(ionic liquid) microgels exhibiting CO2-switchable temperature-responsive volume phase transition behavior have been synthesized and used for CO2 fixation.

Synthesis and Characterization of Comb-Type Grafted Hydrogels

2012 ◽  
Vol 602-604 ◽  
pp. 1274-1284
Author(s):  
Ping Zhang ◽  
Shi Pu Li ◽  
Xin Yu Wang ◽  
Hong Lian Dai
Keyword(s):  
Aqueous Solution ◽  
Fluorescence Spectroscopy ◽  
Lower Critical Solution Temperature ◽  
Ammonium Persulfate ◽  
Solution Temperature ◽  
Synthesis And Characterization ◽  
Critical Solution Temperature

The grafted hydrogels of N-isopropylacrylamide (IPAAm) with 2-hydroxyethylacrylate (HEA) was prepared in an aqueous solution using ammonium persulfate (APS) and N,N,N’,N’-tetramethylethylene diamine (TEMED) as an accelerator. Lower critical solution temperature (LCST) and swelling ratios were measured as a function of temperature. The properties of the hydrogels contained pyrenyl probe in water were investigated by fluorescence spectroscopy.

Synthesis and characterization of poly (ionic liquid) derivatives of N-alkyl quaternized poly(4-vinylpyridine)

2018 ◽  
Vol 124 ◽  
pp. 64-71 ◽  
Author(s):  
Ximena Briones O. ◽  
Ricardo A. Tapia ◽  
Paola R. Campodónico ◽  
Marcela Urzúa ◽  
Ángel Leiva ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Synthesis And Characterization ◽  
Poly Ionic Liquid ◽  
Derivatives Of

scholarly journals Phase-Separation of Cellulose from Ionic Liquid upon Cooling: Preparation of Microsized Particles

2021 ◽  
Author(s):  
Jingwen Xia ◽  
Alistair W. T. King ◽  
Ilkka Kilpelainen ◽  
Vladimir Aseyev
Keyword(s):  
Ionic Liquid ◽  
Phase Separation ◽  
Electrolyte Solutions ◽  
Colloidal Dispersions ◽  
Fiber Spinning ◽  
Solution Temperature ◽  
Experimental Conditions ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature ◽  
Separation Temperature

Abstract Cellulose is an historical polymer, for which its processing possibilities have been limited by the absence of a melting point and insolubility in all non-derivatizing molecular solvents. More recently, ionic liquids (ILs) have been used for cellulose dissolution and regeneration, for example, in the development of textile fiber spinning processes. In some cases, organic electrolyte solutions (OESs), that are binary mixtures of an ionic liquid and a polar aprotic co-solvent, can show even better technical dissolution capacities for cellulose than the pure ILs. Herein we use OESs consisting of two tetraalkylphosphonium acetate ILs and dimethyl sulfoxide (DMSO) or γ-valerolactone (GVL), as co-solvents. Cellulose can be first dissolved in these OESs at 120°C and then regenerated, upon cooling, leading to micro and macro phase-separation. This phenomenon much resembles the upper-critical solution temperature (UCST) type thermodynamic transition. This observed UCST-like behavior of these systems allows for the controlled regeneration of cellulose into colloidal dispersions of spherical microscale particles (spherulites), with highly ordered shape and size. While this phenomenon has been reported for other IL and NMMO-based systems, the mechanisms and phase-behavior have not been well defined. The particles are obtained below the phase-separation temperature as a result of controlled multi-molecular association. The regeneration process is a consequence of multi-parameter interdependence, where the polymer characteristics, OES composition, temperature, cooling rate and time all play their roles. The influence of the experimental conditions, cellulose concentration and the effect of time on regeneration of cellulose in the form of preferential gel or particles is discussed.Regular micro-sized particles regenerated from a cellulose-OES mixture of tetrabutylphosphonium acetate:DMSO (70:30 w/w） upon cooling.

scholarly journals Phase-separation of cellulose from ionic liquid upon cooling: preparation of microsized particles

Cellulose ◽  
2021 ◽  
Author(s):  
Jingwen Xia ◽  
Alistair W. T. King ◽  
Ilkka Kilpeläinen ◽  
Vladimir Aseyev
Keyword(s):  
Ionic Liquid ◽  
Phase Separation ◽  
Electrolyte Solutions ◽  
Colloidal Dispersions ◽  
Fiber Spinning ◽  
Solution Temperature ◽  
Experimental Conditions ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature ◽  
Separation Temperature

Abstract Cellulose is an historical polymer, for which its processing possibilities have been limited by the absence of a melting point and insolubility in all non-derivatizing molecular solvents. More recently, ionic liquids (ILs) have been used for cellulose dissolution and regeneration, for example, in the development of textile fiber spinning processes. In some cases, organic electrolyte solutions (OESs), that are binary mixtures of an ionic liquid and a polar aprotic co-solvent, can show even better technical dissolution capacities for cellulose than the pure ILs. Herein we use OESs consisting of two tetraalkylphosphonium acetate ILs and dimethyl sulfoxide or γ-valerolactone, as co-solvents. Cellulose can be first dissolved in these OESs at 120 °C and then regenerated, upon cooling, leading to micro and macro phase-separation. This phenomenon much resembles the upper-critical solution temperature (UCST) type thermodynamic transition. This observed UCST-like behavior of these systems allows for the controlled regeneration of cellulose into colloidal dispersions of spherical microscale particles (spherulites), with highly ordered shape and size. While this phenomenon has been reported for other IL and NMMO-based systems, the mechanisms and phase-behavior have not been well defined. The particles are obtained below the phase-separation temperature as a result of controlled multi-molecular association. The regeneration process is a consequence of multi-parameter interdependence, where the polymer characteristics, OES composition, temperature, cooling rate and time all play their roles. The influence of the experimental conditions, cellulose concentration and the effect of time on regeneration of cellulose in the form of preferential gel or particles is discussed. Graphical abstract Regular micro-sized particles regenerated from a cellulose-OES mixture of tetrabutylphosphonium acetate:DMSO (70:30 w/w) upon cooling

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