Determination of Solubility Parameters of Ionic Liquids and Ionic Liquid/Solvent Mixtures from Intrinsic Viscosity

A polymer of intrinsic porosity (i.e., PIM-1) has been blended with different ionic liquids (ILs) in order to evaluate the effect of the ILs on the microstructure of the polymer blend. [C 8 MIM][Cl], [BMIM][DCa], [BMPyr][DCa], and [BMIM][Tf 2 N] have been selected and were mixed with PIM-1. Polymer blends containing up to 80 wt % of ILs were prepared by a casting method with chloroform as solvent. SEM images show that during the film formation a structuring of the surface appears depending on the nature and the concentration of ILs, with appearance of well-defined microstructure in the case of [BMIM][Tf 2 N] and [BMIM][DCa]. In the case of [BMIM][Tf 2 N]/PIM-1 film, the lower IL concentration induces the denser film with small micropatterns onto the surface. AFM analysis indicates that the ILs are well dispersed on the surface. X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and water contact angle measurements show that a gradient of IL concentration is observed across the film thickness. It is demonstrated that ILs are versatile co-solvents for inducing controlled micropatterns in polymer membrane surfaces.

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“… Hansen solubility parameters of solvents and ILs . [Color figure can be viewed at http://wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

Ionic liquid mediated surface micropatterning of polymer blends

Lasseuguette

McClements

Koutsos

et al. 2017

J of Applied Polymer Sci

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“…A commonly used set of equations to compute the SPs of a polymer in terms of intrinsic viscosity is,

δ_{italicj, polymer} = \frac{\sum δ_{italicj, italici} ([], η) {}_{i}}{\sum {[italicη]}_{i}}

where δ j , i is the corresponding SP of the i th solvent ( j = D, P, or H) and [ η ] i is the intrinsic viscosity of the polymer in the i th solvent. Thus, it is reasonable to compare the SPs obtained using eq.…”

Section: Resultsmentioning

confidence: 99%

“…So, although viscosity does not permit a direct measurement of the solubility of the polymer, the viscosity of the polymer solutions does provide a way to assess the relative affinity of a polymer in a set of organic solvents. Indeed, the application of intrinsic viscosity measurements to compute the SPs of polymers, epoxy, and alkyd resins, and ionic liquids has been previously reported in the literature . In general, however, these studies used the conventional methods for calculating parameters.…”

Section: Introductionmentioning

confidence: 99%

Solubility parameters and solvent affinities for polycaprolactone: A comparison of methods

Boucher

2020

J of Applied Polymer Sci

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Intrinsic viscosity measurements were used in combination with the functional solubility parameter (FSP) and Hansen solubility parameter (HSP) fitting methods to determine the solubility parameters (SPs) of polycaprolactone (PCL). Despite using only eight solvents, a simple similarity criteria approach showed that the HSPs and FSPs were good predictors of the relative solvent-PCL affinity compared to HSPs available in the literature and SPs calculated using additive group contribution methods. Three complementary computational methodologies-Conductor-like Screening MOdel for Real Solvents (COSMO-RS), partial solvation parameters (PSPs), and a thermodynamic quantitative structure-property relationship (QSPR) approach-were used to substantiate the relative solvent-PCL affinities revealed by the intrinsic viscosity measurements. The solvent affinities predicted by all three techniques were in good agreement with the trend observed in the experimental intrinsic viscosity data, but the COSMO-RS activity coefficients, ln(γ PCL ), were slightly superior to the PSP and thermodynamic QSPR methods, particularly when incorporating the Elbro free-volume combinatorial correction in the COSMO-RS calculations. As part of this study, the FSP fitting algorithm was modified to obtain the PSPs for PCL in terms of the intrinsic viscosity data, thereby, presenting a promising new way to calculate the PSPs of polymers from empirical solubility and solvent affinity data.

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Section: Resultsmentioning

confidence: 99%

“…We propose to interpret the results by postulating that the polarity of an IL is important for the efficiency of the IL to disrupt ionic aggregates of ionomers in THF. Here, the Hildebrand solubility parameter (or cohesive energy) may be used qualitatively to discuss the polarity of ILs, since a higher value of solubility parameter generally indicates greater solvent polarity, 43 although solubility parameters are known for only small number of ILs and solubility parameters cannot be quantitatively used for explaining the behavior of ILs. 44 BMIM has two additional methylene groups compared with EMIM, which makes BMIM-based ILs less polar than EMIM-based ILs, as noted in the decrease of the solubility parameters of C n MIM-bis(trifluoromethylsulfonyl)imide (Tf 2 N) with an increase in n, where n denotes the number of carbons in side chains that are attached to imizadolium cations.…”

Section: Effect Of Chemical Structures Of Ilsmentioning

confidence: 99%

Effect of added ionic liquids on the solubility and viscosity of dilute ionomer solutions in tetrahydrofuran

Taylor

Hara

2018

Polymer International

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Solubility and viscosity behaviors of three ionomers with comparable ion contents of ca 6 mol%, i.e. poly(methyl methacrylate) sodium salt, sulfonated polystyrene calcium salt and sulfonated polystyrene sodium salt, were studied in a low‐polarity solvent, i.e. tetrahydrofuran (THF), containing an ionic liquid (IL). Upon addition to THF, the IL disrupts ionic aggregates to form a homogeneous solution and increases viscosity, because the IL disrupts intramolecular ionic aggregates at dilute concentration. Among eight ILs of the imidazolium family studied, 1‐ethyl‐3‐methylimidazolium trifluoromethanesulfonate performs best. The effectiveness of ILs for disrupting ionic aggregates is discussed in terms of the structures of ionomers and ILs. © 2017 Society of Chemical Industry

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Determination of Solubility Parameters of Ionic Liquids and Ionic Liquid/Solvent Mixtures from Intrinsic Viscosity

Cited by 42 publications

References 110 publications

Ionic liquid mediated surface micropatterning of polymer blends

Ionic liquid mediated surface micropatterning of polymer blends

Solubility parameters and solvent affinities for polycaprolactone: A comparison of methods

Effect of added ionic liquids on the solubility and viscosity of dilute ionomer solutions in tetrahydrofuran

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