Miscibility, viscosity and density of poly (ɛ-caprolactone) in acetone+CO2 binary fluid mixtures

Liu, Kun; Kiran, Erdoǧan

doi:10.1016/j.supflu.2006.03.026

Cited by 25 publications

(5 citation statements)

References 26 publications

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“…A high-pressure−high-temperature falling-cylinder type viscometer shown in Figure was used to determine the viscosity and density of the mixtures simultaneously. The system, which has been discussed in detail in our previous publications, , is basically a view-cell with a variable volume part (VVP), a fall tube (FT), and a fluid circulation loop. The pressure is adjusted at any loading and temperature, by changing the position of a movable piston (PI).…”

Section: Methodsmentioning

confidence: 99%

“…To our knowledge, only Tilly and co-workers reported viscosities for acetone concentrations between 1 and 5 mol % at 313 and 323 K and at pressures up to 24 MPa. We have recently reported viscosity data for acetone, and for solutions of poly(methyl methacrylate) and poly(ε-caprolactone) in acetone or in acetone + carbon dioxide mixtures. , …”

Section: Introductionmentioning

confidence: 99%

“…We have recently reported viscosity data for acetone, and for solutions of poly(methyl methacrylate) and poly(caprolactone) in acetone or in acetone + carbon dioxide mixtures. 23,24 We now report on the densities and viscosities for acetone, carbon dioxide, and acetone + carbon dioxide mixtures containing 10, 25, 50, and 75 wt % carbon dioxide at nominal temperatures of 325, 348, 373, and 398 K and at pressures up to 35 MPa. The flow activation volumes and flow activation energies that are derived from the variation of viscosity with pressure and temperature are also reported.…”

Section: Introductionmentioning

confidence: 99%

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Viscosity, Density and Excess Volume of Acetone + Carbon Dioxide Mixtures at High Pressures

and

Kiran

2007

Ind. Eng. Chem. Res.

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The densities and viscosities of acetone, carbon dioxide, and acetone + carbon dioxide mixtures containing 10, 25, 50, and 75 wt % carbon dioxide were determined at nominal temperatures of 325, 348, 373, and 398 K and at pressures up to 35 MPa using a falling-cylinder type high-pressure viscometer. The densities of carbon dioxide and acetone + carbon dioxide mixtures were found to show crossovers at around 18 MPa for mixtures with CO 2 content less than 50 wt % and at around 23 MPa for mixtures with CO 2 content greater than 50 wt % at 325 K, which shifts to higher pressures with temperature. Acetone displayed higher viscosities than the mixtures. At 325 K, the mixtures were found to show negative excess volumes at all compositions for pressures lower than 28 MPa. The excess volumes become less negative with increasing pressure and are positive above 28 MPa for high carbon dioxide content; at pressures above 55 MPa, they become positive for all compositions. Assessments of several mixing rules for viscosity show that logarithmic equations work well at low temperatures, while simple linear combinations of viscosity or kinematic viscosity work better at higher temperatures. Viscosity of the mixtures could be correlated with density; however, there were no direct correlations between excess viscosity and excess volume. Analysis of the excess Gibbs free energy for the flow suggests strong chemical interactions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Viscosity, Density and Excess Volume of Acetone + Carbon Dioxide Mixtures at High Pressures

and

Kiran

2007

Ind. Eng. Chem. Res.

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“…Viscosity of polymer solutions is of broad interest, and some studies have been reported on the density and viscosity of solutions of polystyrene in n-hexane, 11 methyl cyclohexane 12 or in toluene and toluene + carbon dioxide, 13−15 polyethylene in ethylene, 16 poly(methyl methacrylate) in acetone and acetone + carbon dioxide, 17 and poly(ε-caprolactone) in acetone and acetone + carbon dioxide. 18 However, these solutions differ from base oils that are modified with polymeric additives in that the solvents are small molecules with low viscosity, and the polymers do not display a comblike architecture. No prior study on both density and viscosity and their pressure, temperature, or concentration dependence of base oils modified with polymeric viscosity modifiers of the type explored in the present study has been reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

High-Pressure Density, Viscosity, and Modeling of Mixtures of a Poly(α-olefin) Base Oil Lubricant with Polymeric Additives

Dickmann

Avery

Devlin³

et al. 2020

Ind. Eng. Chem. Res.

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Volumetric properties and viscosity of mixtures of a synthetic poly(α-olefin) base oil with polymethacrylate-based polymeric additives have been studied. Two different polymeric additives were evaluated at addition levels up to 7 wt %. Density data were collected at 298, 323, 348, 373, and 398 K from 10 to 40 MPa in a variable-volume view cell. Viscosity data were collected at 298, 323, 348, and 373 K from 10 to 40 MPa in a high-pressure rotational viscometer. The density and viscosity data were then modeled simultaneously by coupling the Sanchez–Lacombe equation state with the free volume and the density scaling theories of viscosity. Density data were also used to evaluate the derived thermodynamic properties such as isothermal compressibility, isobaric thermal expansion coefficient, and internal pressure. The variations in the volumetric properties and viscosity are discussed in terms of the nature of the polymeric additive and polymer concentration in the mixture. It is shown that for each oil, density scaling reduces the viscosity values generated at different temperatures and pressures into a master curve. Density scaling parameters provide new insights into the effectiveness of the polymeric additives as viscosity modifiers in terms of addition levels and the temperature sensitivity of viscosity.

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“…The thickening mechanism has been attributed to the formation of networks, starting at the critical association concentration . There are reports − where polymers with relatively low M w are shown to notably thicken solvents at concentrations as low as 5 wt %.…”

Section: Introductionmentioning

confidence: 99%

CO₂ Viscosification by Functional Molecules from Mesoscale Simulations

Goicochea

Firoozabadi

2019

J. Phys. Chem. C

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The viscosity increase of carbon dioxide by copolymers is predicted using dissipative particle dynamics simulations, as a function of polymer concentration. Three types of direct viscosifying polymers are simulated: a fluorinated acrylate polymerized with styrene and two nonfluorinated copolymers. The latter are the hydrocarbon-based poly(1-decene), which is branched, and the linear poly(vinyl ethyl ether). These polymers associate differently in CO2 because of their different molecular and chemical characteristics. The effect of different association mechanisms in increasing the viscosity of CO2 is investigated in detail. It is found that intermolecular interactions and branched structure contribute to CO2 thickening. In the fluorinated copolymer, intermolecular π-stacking interactions significantly affect CO2 viscosification. These are the first simulations of the viscosity of CO2 thickeners; our simulations agree with recent experimental data, providing insights into the thickening mechanisms at play of each molecule. This work sets the stage for the molecular engineering of new CO2 viscosifiers.

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Miscibility, viscosity and density of poly (ɛ-caprolactone) in acetone+CO2 binary fluid mixtures

Cited by 25 publications

References 26 publications

Viscosity, Density and Excess Volume of Acetone + Carbon Dioxide Mixtures at High Pressures

Viscosity, Density and Excess Volume of Acetone + Carbon Dioxide Mixtures at High Pressures

High-Pressure Density, Viscosity, and Modeling of Mixtures of a Poly(α-olefin) Base Oil Lubricant with Polymeric Additives

CO₂ Viscosification by Functional Molecules from Mesoscale Simulations

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Miscibility, viscosity and density of poly (ɛ-caprolactone) in acetone+CO2 binary fluid mixtures

Cited by 25 publications

References 26 publications

Viscosity, Density and Excess Volume of Acetone + Carbon Dioxide Mixtures at High Pressures

Viscosity, Density and Excess Volume of Acetone + Carbon Dioxide Mixtures at High Pressures

High-Pressure Density, Viscosity, and Modeling of Mixtures of a Poly(α-olefin) Base Oil Lubricant with Polymeric Additives

CO2 Viscosification by Functional Molecules from Mesoscale Simulations

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Product

Resources

About

CO₂ Viscosification by Functional Molecules from Mesoscale Simulations