Intensification phenomenon of weak ionic interactions of 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid macro-dispersed in poly(methyl methacrylate): FTIR spectroscopic evidence

Ramenskaya, L. M.; Гришина, Е. П.

doi:10.1016/j.molliq.2016.02.037

Cited by 22 publications

(18 citation statements)

References 26 publications

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“…, –C O group from WPU and P–F group from anion. 31 A possible interaction model in the [emim][PF 6 ]/WPU composite membranes is depicted in Fig. 4 .…”

Section: Resultsmentioning

confidence: 99%

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

Tang

Hao

et al. 2018

RSC Adv.

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“…, –C O group from WPU and P–F group from anion. 31 A possible interaction model in the [emim][PF 6 ]/WPU composite membranes is depicted in Fig. 4 .…”

Section: Resultsmentioning

confidence: 99%

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

Tang

Hao

et al. 2018

RSC Adv.

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“…For the PVC‐g‐PHEMA‐g‐PBVIm‐Br membrane (M2), an obvious absorption band appeared at around 1163 cm −1 , which was correlated with C─H stretching in the imidazole ring. Meanwhile, the adsorption peak at 1563 cm −1 was attributed to the stretching vibration adsorption peak of ─C═N in the imidazole ring. Fourier transform infrared spectroscopy results indicated that poly(ionic liquid) brushes (PBVIm‐Br) were grafted onto the PVC membrane surface.…”

Section: Resultsmentioning

confidence: 99%

Improving the hydrophilic and antifouling properties of poly(vinyl chloride) membranes by atom transfer radical polymerization grafting of poly(ionic liquid) brushes

Cheng

et al. 2017

Polymers for Advanced Techs

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In this study, poly(1-butyl-3-vinylimidazolium bromide) (PBVIm-Br) was grafted onto the poly(vinyl chloride) (PVC) membrane surface via a 2-step atom transfer radical polymerization (ATRP) reaction. Poly(2-hydroxyethylmethacrylate) (PHEMA) was grafted onto the membrane surface by aqueous ATRP reaction; then, BVIm-Br was introduced onto the surface of the PHEMA-modified PVC membrane through traditional ATRP reaction. The analysis of surface chemistry confirmed the successful grafting of PHEMA and PBVIm-Br on PVC membrane surface, and the grafting density (GD) of PBVIm-Br gradually increased as the grafting time was prolonged. The modified membrane exhibited a positive charge and significantly enhanced surface hydrophilicity. The static water contact angle of the membrane surface decreased from 92.3°to 51.6°as the GD of the PBVIm-Br brushes increased. Filtration experiments indicated that the water flux of the modified membrane increased with increasing GD, and their recovered fluxes were more than twice than the original. In addition, the total fouling ratio of the membranes decreased from 89% in M0 to 67% in M5, and most of the fouling was reversible as the GD of PBVIm-Br brushes increased.These results indicated that the positive charged poly(ionic liquid) brushes featuring hydrophilic properties would have potential applications in membrane separation. KEYWORDS | Preparation of PVC membranesPoly(vinyl chloride) membranes were prepared using classical immersion precipitation method. | ATRP grafting of poly(ionic liquid) brushes onto PVC membranesThe grafting process includes 2 steps, which are shown in Figure 1. | Membrane characterizationThe chemical compositions of the membranes were characterized by The morphologies of the membranes were observed via scanning electron microscopy (SEM; Phenom G2 pro, Holland). Samples were fractured in liquid nitrogen to obtain orderly cross sections and then sputter coated with gold before SEM observation.The zeta potentials of the membranes were measured through a streaming potential method using an electro kinetic analyzer (SurPASS Anton Paar, GmbH, Austria). The pH of the solution was adjusted by adding NaOH or HCl solution, and the measurement was performed at 25°C.The water CAs of the membranes were measured with a data physics instrument (OCA20, Dataphysics, Germany) under a sessile drop model at room temperature, and the instrument was equipped with a camera to capture images. | Grafting densityThe final grafted PVC membranes were thoroughly washed in DI water and then dried in a vacuum oven at 55°C to constant weight; the grafting density (GD) (μg/cm 2 ) of the grafted membrane was calculated as follows 28:where W is the weight of the PVC grafted membrane (g), W 0 is the weight of the previous membranes before grafting (g), and A is the area of the membrane (m 2 ). | Filtration propertiesThe filtration properties of the membranes were examined using a vacuum filter apparatus. A piece of each test membrane (separation area of 3.46 cm 2 ) was fixed between the top ...

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“…The characteristic peaks of both BMIMPF 6 and IL-GNs curves are observed at 3172, 1385, 1169, 748, and 555 cm −1 , corresponding to the vibration of methine (C-H) in cyclic BMIM + . The bands at 842 and 1574 cm −1 are attributed to the stretching vibration of PF 6 − and the carbon-nitrogen bond (C-N) inside BMIMPF 6 , respectively [42][43][44][45]. In addition, the FT-IR spectrum of GNs shows the bands at 1649 cm −1 for carbonyl (C=O) [46], which means that GNs were partially oxidized to graphene oxide (GO) during the heat treatment of expandable graphite.…”

Section: Characterization Methodsmentioning

confidence: 99%

Preparation of Ionic Liquid-Coated Graphene Nanosheets/PTFE Nanocomposite for Stretchable, Flexible Conductor via a Pre-Stretch Processing

Kou

et al. 2019

Nanomaterials

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The various volume concentrations of ionic liquid-modified graphene nanosheets filled polytetrafluoroethylene nanocomposites (IL-GNs/PTFE) for flexible conductors were fabricated via a pre-stretch processing method after cold-press sintering. The results indicated that pre-stretching has no significant weakening in the electrical conductivity of the nanocomposites, while the Young’s modulus greatly reduced by 62.5%, which is more suitable for flexible conductors. This may be because the reduced conductivity by the destructive conductive pathway cancels out the enhanced conductivity by the increased interlamellar spacing of IL-GNs via a pre-stretch processing, and the nanocomposite exhibits a phase transition from two to three-phase (with the introduction of an air phase) during pre-stretching. It was also found that the tensile strength of the nanocomposites was enhanced by 42.9% and the elongation at break and thermal conductivity decreased slightly with the same filler content after pre-stretching. The electrical conductivity of the pre-stretched nanocomposites tended to stabilize at 5.5 × 10−2 s·m−1, when the volume content of the packings achieved a percolation threshold (1.49 vol%). Meanwhile, the electrical resistivity of the pre-stretched 3.0 vol% IL-GNs/PTFE nanocomposite was slightly reduced by 0.30%, 0.38%, and 0.87% respectively after 180° twisting, 180° bending, and 10% stretching strain for 1000 cycles.

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Intensification phenomenon of weak ionic interactions of 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid macro-dispersed in poly(methyl methacrylate): FTIR spectroscopic evidence

Cited by 22 publications

References 26 publications

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

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

Improving the hydrophilic and antifouling properties of poly(vinyl chloride) membranes by atom transfer radical polymerization grafting of poly(ionic liquid) brushes

Preparation of Ionic Liquid-Coated Graphene Nanosheets/PTFE Nanocomposite for Stretchable, Flexible Conductor via a Pre-Stretch Processing

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