Features of Phase Separation in Polymeric Systems: Cloud-Point Curves (Discussion)

Klenin, V. J.; Shmakov, S. L.

doi:10.13189/ujms.2013.010205

Cited by 8 publications

(7 citation statements)

References 10 publications

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“…For the L → LL transitions, despite the lack of consensus regarding the experimental identification of CPPs 68 and the slight differences in polymer architecture, the measured and published data are in remarkable agreement (Figure 10). A similar composition independence of the transition pressures reported by Chen et al 47 and Haruki et al 17 is also seen in this work, but the pressures at low polymer concentrations (<1 wt %) are higher for the (nC 6 + PEH199-3) system than the (nC 6 + hPBD108) system.…”

Section: Methods Verificationmentioning

confidence: 71%

“…Whilst the L → VL and LL → VLL pressures in the (nC 6 + PEH199-3) system should coincide with the vapor pressure of nhexane, 10 only qualitative comparisons will be possible to verify the L → LL pressures because of the variation of polymers and the lack of consensus regarding the experimental identification of a cloud point pressure (CPP). 68 To confirm the accuracy of the L → VL and LL → VLL transitions, the vapor pressure of pure n-hexane was considered. Because of the substantial molar masses of the polyethylene samples shown in Figure 9, they are nonvolatile and will decompose before reaching the temperatures theoretically required to vaporize.…”

Section: Methods Verificationmentioning

confidence: 99%

“…L → VL and LL → VLL pressures (Figure ) and L → LL pressures (Figure ) of the ( n C 6 + PEH199-3) system were measured (Table ) and are compared to the vapor pressure of n -hexane and cloud points reported by Chen et al and Haruki et al (same research group using the same equipment). Whilst the L → VL and LL → VLL pressures in the ( n C 6 + PEH199-3) system should coincide with the vapor pressure of n -hexane, only qualitative comparisons will be possible to verify the L → LL pressures because of the variation of polymers and the lack of consensus regarding the experimental identification of a cloud point pressure (CPP) …”

Section: Methods Verificationmentioning

confidence: 99%

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Influence of α-Olefin Concentration and Length on the High-Pressure Phase Behavior of (α-Olefin + n-Hexane + LLDPE) Systems

Swanepoel

Schwarz

2019

J. Chem. Eng. Data

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Liquid to vapor–liquid, liquid–liquid to vapor–liquid–liquid, and liquid to liquid–liquid transition pressures of (α-olefin + n-hexane + LLDPE) systems were measured using a newly constructed and verified synthetic-visual high-pressure cell and metallocene linear low-density polyethylene (LLDPE: M̅ w = 199 kg·mol–1, M̅ w/M̅ n = 2.62, 2.56 mol % 1-hexene). New phase behavior data are reported for a quasibinary (n-hexane + LLDPE) system at polymer mass percentages of w P = (0.5–5) wt % and quasiternary (α-olefin + n-hexane + LLDPE) systems for w P = 3 wt % and polymer-free α-olefin mass percentages of up to 3 wt % ethylene, 20 wt % 1-butene, 100 wt % 1-hexene, 30 wt % 1-octene, and 30 wt % 1-decene. The reported data span temperatures of T = (380–470) K and pressures of P = (0.5–13) MPa. They show that (i) transition temperatures and pressures change linearly with α-olefin mass fraction in the solvent; (ii) the C2 to C6 α-olefins decrease, and the C8 to C10 α-olefins increase the transition temperatures; and (iii) ethylene has a significant antisolvency effect. The measured data are correlated and predicted successfully with the modified Sanchez–Lacombe equation of state.

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Section: Methods Verificationmentioning

confidence: 71%

Section: Methods Verificationmentioning

confidence: 99%

Section: Methods Verificationmentioning

confidence: 99%

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Influence of α-Olefin Concentration and Length on the High-Pressure Phase Behavior of (α-Olefin + n-Hexane + LLDPE) Systems

Swanepoel

Schwarz

2019

J. Chem. Eng. Data

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“…The cloud point (CP) was determined according to the method suggested by Wijmans et al . and Klenin at al . through the identification of the area where the phase inversion occurs …”

Section: Resultsmentioning

confidence: 99%

“…The cloud point (CP) was determined according to the method suggested by Wijmans et al 47 and Klenin at al. 48 through the identification of the area where the phase inversion occurs. 17 The ternary phase diagram is composed of two regions: a single-phase area represented by the homogeneous polymer solution and a two-phase area where the liquid−liquid demixing occurs, leading to the formation of a polymer-rich and a polymer-poor region.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Dimethyl Isosorbide As a Green Solvent for Sustainable Ultrafiltration and Microfiltration Membrane Preparation

Russo

Galiano

Pedace

et al. 2019

ACS Sustainable Chem. Eng.

118

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Dimethyl isosorbide (DMI)a well-known biobased high boiling green solventwas used for the first time in the preparation of poly(vinylidene fluoride)- and poly(ether sulfone)-based membranes. Preliminary thermodynamic (Hansen and Hildebrand solubility parameters, relative energy difference) and kinetic (viscosity) studies on DMI confirmed that this solvent possesses the required physical/chemical properties to be exploited in casting membranes. Membranes were prepared by nonsolvent induced phase separation (NIPS) and a combination of vapor induced phase separation (VIPS)-NIPS techniques varying the exposure time to humidity. This latter approach led to the formation of membranes with a porous architecture avoiding the use of any pore forming additive. The so-prepared membranes were, then, fully characterized in terms of morphology, polymorphism (in case of PVDF), wettability, thickness, porosity, pore size, and water permeability. The membranes revealed different structures and a tunable pore size in the range of ultrafiltration (UF) and microfiltration (MF) that render them ideal for applications in water treatment processes.

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Study on ionic liquid/cellulose/coagulator phase diagram and its application in green spinning process

Liu

Nie

Pan

et al. 2019

Journal of Molecular Liquids

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Features of Phase Separation in Polymeric Systems: Cloud-Point Curves (Discussion)

Cited by 8 publications

References 10 publications

Influence of α-Olefin Concentration and Length on the High-Pressure Phase Behavior of (α-Olefin + n-Hexane + LLDPE) Systems

Influence of α-Olefin Concentration and Length on the High-Pressure Phase Behavior of (α-Olefin + n-Hexane + LLDPE) Systems

Dimethyl Isosorbide As a Green Solvent for Sustainable Ultrafiltration and Microfiltration Membrane Preparation

Study on ionic liquid/cellulose/coagulator phase diagram and its application in green spinning process

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