Morphology and pervaporation performance of ionic liquid and waterborne polyurethane composite membranes

Xi, Tao; Tang, Lin; Hao, Wentao; Yao, Lulu; Cui, Peng

doi:10.1039/c7ra13761c

Cited by 14 publications

(11 citation statements)

References 39 publications

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“…As it is possible to notice from the micrographs, the 1% of addition for both did not significantly change the morphology of matrix sample, presenting merely a slightly increment of the roughness. Conversely, both film blends at 5% of ILs (IL1, Figure 4 C and IL2, Figure 4 D) showed discontinuous and more roughly morphologies, consisting of island-like structures as also observed by Xi et al [ 30 ]. At this concentration, a decrease in compatibility with the polymer matrix was experienced determining a surface segregation with formation of microstructures with sizes ranging from 5 to 20 µm.…”

Section: Resultssupporting

confidence: 78%

Heterogenized Imidazolium-Based Ionic Liquids in Pebax®Rnew. Thermal, Gas Transport and Antimicrobial Properties

et al. 2020

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Imidazolium-based ionic liquids (ILs) have interesting antimicrobial activity and their inclusion in a flexible film is ideal to take advantage of their properties in practical applications. Poly(ether-block-amide) (Pebax®Rnew) films were prepared by solution casting, loading two synthetized ILs (1-hexadecyl-3-methylimidazolium dimethyl-5-sulfoisophthalate [Hdmim][DMSIP], IL1 and 1-octyloximethyl-3-methylimidazolium hexafluorophosphate [OOMmim][PF6], IL2) up to 5 wt.%. The ILs were characterized by 1H NMR and MALDI-TOF spectroscopy. The films were investigated for miscibility, morphology, wettability, spectral properties and gas transport. The films display a good thermal stability (>200 °C). Differential scanning calorimetry (DSC) proves phase separation in the blends, that is consistent with FTIR analysis and with the island-like surface morphology observed in the micrographs. Gas permeability tests revealed that the IL-loaded films are dense and poreless, keeping the selectivity of the polymer matrix with a somewhat lessened permeability owing to the impermeable ILs crystals. The film antimicrobial activity, evaluated against Gram-negative and Gram-positive bacterial strains, was correlated to the structure of the incorporated ILs. The smaller IL2 salt did not modify the hydrophobic nature of the neat polymer and was readily released from the films. Instead, IL1, having a longer alkyl chain in the cation, provided a promising antimicrobial activity with a good combination of hydrophilicity, permeability and thermal stability.

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Section: Resultssupporting

confidence: 78%

Heterogenized Imidazolium-Based Ionic Liquids in Pebax®Rnew. Thermal, Gas Transport and Antimicrobial Properties

et al. 2020

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“…Xi et al [57] indicated that the addition of the high loading of the 1-ethyl-3-methylimidazolium hexafluorophosphate (EMIM)(PF6) to waterborne polyurethane (WPU) membranes results in the microphase separation. At high (EMIM)(PF6) content (over 10 wt %) the IL-rich domains were formed on the membrane surface which was attributed to the incompatibility between the IL and WPU matrix [57].…”

Section: Resultsmentioning

confidence: 99%

“…The authors observed that the studied imidazolium-based ionic liquids are homogeneously distributed within Nylon ® membranes which was reflected by the SEM-EDX analysis recorded at the membrane cross-section [56]. Xi et al [57] reported the homogenous dispersion of 1-ethyl-3-methylimidazolium hexafluorophosphate (EMIM)(PF6) in the waterborne polyurethane (WPU) membranes up to the 10 wt % of (EMIM)(PF6). The increase of the (EMIM)(PF6) content above 10 wt % resulted in the formation of IL-rich domains that were dispersed in the WPU matrix [57].…”

Section: Resultsmentioning

confidence: 99%

“…Xi et al [57] reported the homogenous dispersion of 1-ethyl-3-methylimidazolium hexafluorophosphate (EMIM)(PF6) in the waterborne polyurethane (WPU) membranes up to the 10 wt % of (EMIM)(PF6). The increase of the (EMIM)(PF6) content above 10 wt % resulted in the formation of IL-rich domains that were dispersed in the WPU matrix [57].…”

Section: Resultsmentioning

confidence: 99%

“…It was related to the lower viscosity of the RIL3_BF4 IL in the comparison to polymeric matrix and higher interaction between IL and AFM probe. Xi et al [57] applied AFM analysis and observed an increase of the surface roughness of the waterborne polyurethane (WPU) membranes with increasing IL content. It was found that the presence of (EMIM)(PF6) disrupts the polymer chains order resulting in the rougher WPU-(EMIM)(PF6) membranes compared to the flat surface of pristine WPU.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Preparation and Characterization of Cellulose Acetate Propionate Films Functionalized with Reactive Ionic Liquids

et al. 2019

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1-(1,3-diethoxy-1,3-dioxopropan-2-ylo)-3-methylimidazolium bromide (RIL1_Br), 1-(2-etoxy-2-oxoethyl)-3-methylimidazolium bromide (RIL2_Br), 1-(2-etoxy-2-oxoethyl)-3-methylimidazolium tetrafluoroborate (RIL3_BF4) ionic liquids were synthesized. Subsequently, the dense cellulose acetate propionate (CAP)-based materials containing from 9 to 28.6 wt % of these reactive ionic liquids were elaborated. Reactive ionic liquids (RILs) were immobilized in CAP as a result of the transesterification reaction. The yield of this reaction was over 90% with respect to the used RIL. The physicochemical properties of resultant films were studied using nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), atomic force microscopy (AFM), and thermogravimetric analysis (TGA). The RIL incorporation influenced the morphology of films by increasing their surface roughness with the rise of RIL content. The thermal stability of CAP-based membranes was dependent on the nature of the ionic liquid. Nevertheless, it was proven that CAP films containing RILs were stable up to 120–150 °C. Transport properties were characterized by water permeation tests. It was found that the type and the amount of the ionic liquid in the CAP matrix substantially influenced the transport properties of the prepared hybrid materials.

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Poly(ionic liquid)s-based polyurethane blends: effect of polyols structure and ILs counter cations in CO2 sorption performance of PILs physical blends

et al. 2021

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Carbon dioxide (CO 2 ) capture from natural gas, and further utilization is an essential issue for greenhouse gas reduction. Poly(ionic liquid)s (PILs) assemble ILs unique properties, with those of polymers being versatile materials for CO 2 capture from flue gas (CO 2 /N 2 ) and natural gas (CO 2 /CH 4 ). PILs based on polyurethanes obtained with different polyols and ILs cations were blended in different proportions aiming to improve PILs CO 2 sorption capacity. Two different polyols structures (PC and PG) and ILs counter cations (imidazolium and phosphonium) were tested to evaluate how they influence PILs blends CO 2 sorption performance. PILs and PILs blends were characterized by SEC, FTIR, DSC, TGA, DMTA, AFM, and CO 2 sorption that were carried out using the pressure-decay technique. PILs blends presented good thermal stability and mechanical properties. PILs blend polyurethane backbones compositions can be tuned aiming to increase CO 2 sorption capacity. As far as we know, all obtained PILs blends presented higher CO 2 sorption capacity results compared with other Poly(ionic liquid)s reported in the literature. The best CO 2 sorption result was obtained for PIL blend with imidazolium (PLIPC95-PG5-BMIM = 116.9 mgCO 2 /g at 303.15 K and 10 bar).

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Morphology and pervaporation performance of ionic liquid and waterborne polyurethane composite membranes

Abstract: Possible model of interactions in [emim][PF6]/WPU composite membranes.

Cited by 14 publications

References 39 publications

Heterogenized Imidazolium-Based Ionic Liquids in Pebax®Rnew. Thermal, Gas Transport and Antimicrobial Properties

Heterogenized Imidazolium-Based Ionic Liquids in Pebax®Rnew. Thermal, Gas Transport and Antimicrobial Properties

Preparation and Characterization of Cellulose Acetate Propionate Films Functionalized with Reactive Ionic Liquids

Poly(ionic liquid)s-based polyurethane blends: effect of polyols structure and ILs counter cations in CO2 sorption performance of PILs physical blends

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