Solubility of Homopolymers and Copolymers in Carbon Dioxide

O’Neill, Mark L.; Cao, Qing; Fang, Mingliang; Johnston, Keith P.; Wilkinson, S. P.; Smith, C. D.; Kerschner, Judith L.; Jureller, Sharon H.

doi:10.1021/ie980010x

Cited by 323 publications

(411 citation statements)

References 51 publications

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“…Over the past few decades supercritical carbon dioxide (sc-CO2) has been used for various applications [3][4] and interest still remains high today [5][6][7][8]. As such CO2 is a nonpolar molecule with low dielectric constant and solubility parameter, which makes it unsuitable for dissolving polar and high-molecular-weight materials [9]. These weak solvent properties undoubtedly limit the practical applications of sc-CO2.…”

Section: Introductionmentioning

confidence: 99%

Economical and Efficient Hybrid Surfactant with Low Fluorine Content for the Stabilisation of Water-in-CO2 Microemulsions

Mohamed

Ardyani

Sagisaka³

et al. 2015

The Journal of Supercritical Fluids

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The article addresses an interesting issue in the development of hybrid surfactants for waterin-CO2 (w/c) microemulsion stabilisation: the role of surfactant headgroup on the surfactant performance. The synthetic procedure, aqueous properties, and phase behaviour of a new hybrid sulfoglutarate surfactant are described. The compound resembles sulfosuccinate surfactants, commonly used to stabilize w/c phases, but with an extra methylene group incorporated into the hydrophilic headgroup. For comparison purposes, the related hydrocarbon (AOT14 and AOT14GLU) and fluorocarbon (di-CF2 and di-CF2GLU) surfactants are used to form w/c microemulsions. In general, the aqueous properties and w/c phase stability of both sulfoglutarates and sulfosuccinates are found to be similar, which shows the secondary role of the hydrophilic headgroup. Interestingly, the newly synthesised hybrid CF2/AOT14GLU (sodium (4H,4H,5H,5H,5H-pentafluoropentyl-2,2-dimethyl-1-propyl)-2-sulfoglutarate) proved to be more efficient than the normal sulfosuccinate, hybrid CF2/AOT14 (Ptrans = 383 bar, γcmc = 26.8 mN m -1 ) in terms of the aqueous behaviour and w/c phase stability.Switching to the sulfoglutarate compound, hybrid CF2/AOT14GLU (Ptrans = 232 bar, γcmc = 20.6 mN m -1 ) more effectively decreases the air-water surface tension by about ~ 5 mN m -1 as compared to the sulfosuccinate. High-pressure phase behaviour studies show significant improvements in stabilising w/c microemulsions at much lower cloud pressures. The results indicate distinct effects of the headgroup structure on the phase behaviour and physicochemical properties, particularly for this hybrid surfactant.

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Section: Introductionmentioning

confidence: 99%

Economical and Efficient Hybrid Surfactant with Low Fluorine Content for the Stabilisation of Water-in-CO2 Microemulsions

Mohamed

Ardyani

Sagisaka³

et al. 2015

The Journal of Supercritical Fluids

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“…These conditions of temperature and pressure were chosen because it was assumed that any inherent solubility of the polymer in supercritical CO 2 would decrease rapidly as the pressure and temperature approaches the critical point [36] and because they allow for a single-phase mixture after depressurization. Furthermore, O'Neill et al [37] state that: ''Polymers in general have very limited solubility in supercritical fluid (SF) CO 2 at temperatures below 80 jC, although solubilities can increase significantly at higher temperature.'' Thus, in spite of a marked increase in the density of supercritical CO 2 (e.g., using the Peng-Robinson [38] equation of state, the density of pure CO 2 is 0.321 at 127 bars and 80 jC and 0.770 at 118 bars and 30 jC), polymers appear to be much less soluble at lower temperatures.…”

Section: Coating With Pvcvamentioning

confidence: 99%

“…6f) shows that fine polymer particles (around 2 Am) aggregate on the surface. The 2-Am polymer particles were produced due to the change in the temperature and pressure of CO 2 , which lowers the solubility of polymer in the supercritical CO 2 [3,37].…”

Section: Coating With Pvcvamentioning

confidence: 99%

Extraction and precipitation particle coating using supercritical CO2

et al. 2002

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A modified RESS process for particle coating with a solution of polymer in supercritical CO 2 was studied in this research. This technique involves extracting the polymer with supercritical CO 2 , with or without a cosolvent in an extraction vessel, and then precipitating the polymer onto the surface of host particles in a second precipitation vessel by adjusting the pressure and temperature inside the precipitator to lower its solubility. The research was performed using a pilot-scale supercritical apparatus, glass beads as host particles and two different polymers as coating materials. Experiments showed that the coating of glass beads with polyvinyl chloride-co-vinyl acetate (PVCVA) and hydroxypropyl cellulose (HPC) was successfully achieved. Scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), energy dispersive X-ray mapping and thermogravimetric analysis (TGA) were used to characterize the coatings obtained. The results indicate that the process of particle coating with supercritical solution is a promising environmentally friendly, alternative coating method with little or no organic solvents required.

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“…As such CO2 is a nonpolar molecule with low dielectric constant and solubility parameter, which makes it unsuitable for dissolving polar and high-molecular-weight materials [9]. These weak solvent properties undoubtedly limit the practical applications of sc-CO2.…”

Section: Introductionmentioning

confidence: 99%

Effect of surfactant headgroup on low-fluorine-content CO2-philic hybrid surfactants

Mohamed

Ardyani

Bakar

et al. 2016

The Journal of Supercritical Fluids

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms AbstractThe article addresses the role of surfactant headgroup structure on hybrid surfactant performance for water-in-CO2 (w/c) microemulsion stabilisation. The synthetic procedure, aqueous properties, and phase behaviour of a new hybrid sulfoglutarate surfactant are described. The sulfoglutarate version has an extra methylene group incorporated into the hydrophilic headgroup. The related hydrocarbon (AOT14 and AOT14GLU) and fluorocarbon (di-CF2 and di-CF2GLU) surfactants were used to form w/c microemulsions. For these two groups, the aqueous properties and w/c phase stability of both sulfoglutarates and sulfosuccinates were found to be similar. The newly synthesized hybrid CF2/AOT14GLU (sodium (4H,4H,5H,5H,5H-pentafluoropentyl-2,2-dimethyl-1-propyl)-2-sulfoglutarate)proved to be more efficient than the normal sulfosuccinate, hybrid CF2/AOT14 in terms of the aqueous behaviour and w/c phase stability. Hybrid CF2/AOT14GLU more effectively decreased the air-water surface tension by ~ 2 mN m -1 and lowering the cloud pressures on CO2 by ~150 bar.

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Solubility of Homopolymers and Copolymers in Carbon Dioxide

Cited by 323 publications

References 51 publications

Economical and Efficient Hybrid Surfactant with Low Fluorine Content for the Stabilisation of Water-in-CO2 Microemulsions

Economical and Efficient Hybrid Surfactant with Low Fluorine Content for the Stabilisation of Water-in-CO2 Microemulsions

Extraction and precipitation particle coating using supercritical CO2

Effect of surfactant headgroup on low-fluorine-content CO2-philic hybrid surfactants

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