Thermally stable organically modified layered silicates based on alkyl imidazolium salts

Goswami, Shailesh K.; Ghosh, Smita; Mathias, Lon J.

doi:10.1016/j.jcis.2011.11.032

Cited by 14 publications

(13 citation statements)

References 15 publications

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“…In IL FTIR spectrum, it was possible to see a wide and intense band in the region of 3100 to 3500 cm −1 [Figure (a)] related to vibration of hydroxyl groups, possibly due to water contained in the material and also to the vibration of the terminal hydroxyl substituent chain of the organic salt. This peak is also observed by other authors that synthetized IL with hydroxyl terminal groups . Active bands in the FTIR regarding the imidazoline ring have been reported by some authors in their respective studies on ILs, and a close agreement between the vibrations related to the imidazoline ring exists in 2949 cm −1 (CH stretching in methyl group); 1535 to 1471 cm −1 (CC and CN stretching within the imidazoline ring and CH bending‐in‐plane); 1159 cm −1 (CN stretching) and 858 and 751 cm −1 (CH bending‐out‐of‐plane) …”

Section: Resultssupporting

confidence: 82%

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Polycarbonate/1‐(2‐hydroxyethyl)‐2,3‐dimethylimidazolium chloride composite membranes and short‐range chain mobility analysis

Oliveira

Vedovello

Paranhos

2017

J of Applied Polymer Sci

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In this investigation, the incorporation of imidazolium salt, 1‐(2‐hydroxehtyl)‐2,3‐dimethylimidazolium chloride [hydemmim][Cl] within bisphenol A polycarbonate (PC) matrix and the subsequent formation of membranes via casting were studied. Characterizations that aimed to establish structure‐property correlations by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical thermal analysis, and water vapor transport (WVT) were performed. The results indicated that the presence of ionic liquid (IL) within the PC matrix significantly alter the local and macromolecular structure. The thermal stability is increased for all levels of incorporation. The plasticizing and antiplasticizing effects were observed due to the influence of the proportions of IL incorporated and of the cation's substituent chain of this IL. Distinct mechanisms of WVT were also observed in the presence of IL. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45117.

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Section: Resultssupporting

confidence: 82%

“…They have application in electrochemistry, catalysis, nanotechnology, and other areas . In polymer science, ILs are widely used not only as solvents in polymerization processes but also as components of the polymeric matrixes .…”

Section: Introductionmentioning

confidence: 99%

Polycarbonate/1‐(2‐hydroxyethyl)‐2,3‐dimethylimidazolium chloride composite membranes and short‐range chain mobility analysis

Oliveira

Vedovello

Paranhos

2017

J of Applied Polymer Sci

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“…The extended temperature domain for the decomposition of the intercalated RTILs could have different origins. It might be explained either by the barrier properties of the clay mineral layers which hindered the oxygen molecules diffusion needed to decompose the organic matters or by the absence of the halides (Cland Brwere fully removed from the samples by washing after the cationic exchange) known to catalyse the decomposition process [33]. indicated that the amount of ionic liquid intercalated slightly decreased for Na + concentrations at least equal to 1 mol.L -1 .…”

Section: Thermogravimetric Determination Of the Rtil Intercalated Amountmentioning

confidence: 99%

Adsorption of imidazolium and pyridinium ionic liquids onto montmorillonite: Characterisation and thermodynamic calculations

Reinert

Batouche

Lévêque

et al. 2012

Chemical Engineering Journal

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Five first generation ionic liquids (RTILs : BMImCl, OMImCl, AMImCl, BPyBr and OPyBr) were intercalated into the layered structure of a Na-montmorillonite by dispersion in aqueous solutions ([RTIL]  20 mmol.L -1 ). For all ionic liquids, the intercalation expanded the spacing of the silicate layers, as measured by X-ray diffraction. FTIR, thermogravimetric analyses and sodium titrations of the solutions after intercalation proved the adsorption of the RTILs through a cation exchange mechanism. Adsorption isotherms, done at pH = 7 and at 25°C, displayed that the maximum adsorption capacity of the substrates was closely linked to the nature of the organic cation and the length of the alkyl chain (BPyBr > OPyBr ~ AMImCl ~ BMImCl > OMImCl). For the five RTILs, calculated parameters obtained from the adsorption isotherms studied at 3 temperatures (25°C, 40°C and 55°C) concluded to an endothermic and spontaneous adsorption reaction.

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“…The dispersion of nano‐scale clay in the polymer matrix was the primary factor affecting the high performance of traditional polymers, which was usually related to the nature of clay and the preparation process of composites. Naturally occurring clay is hydrophilic, which inevitably causes agglomeration by direct blending with polymer and usually requires surface modification by intercalation with organic cations such as alkylammonium , phosphonium , pyridinium , and imidazolium to render it organic compatible. In this respect, a lot of researches have been done to improve the dispersion of clay in polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Achieving high thermal and mechanical properties of epoxy nanocomposites via incorporation of dopamine interfaced clay

Chen

et al. 2017

Polymer Composites

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The uniform dispersion of clay in epoxy matrix and strong interfacial bonding between clay platelet and epoxy chains are crucial for achieving epoxy/clay with enhanced thermal and mechanical properties. In this study, dopamine hydrochloride was intercalated into the galleries of clay via ion‐exchange reaction with an aim to improve the dispersion and interfacial bonding with the epoxy matrix. Dopamine intercalated clay (D‐clay) was characterized by X‐ray photoelectron spectrum, Fourier Transform Infrared Spectroscopy, and X‐ray diffraction (XRD), respectively. Epoxy/D‐clay nanocomposites had been prepared by curing process of epoxy E51, Jeffamine D230, and D‐clay with 1, 2, 3, and 4 wt%, respectively. The structure of epoxy/D‐clay nanocomposites was characterized by XRD, scanning electron microscopy, and Transmission electron microscopy, respectively. The enhanced thermal properties and mechanical properties such as tensile strength, tensile modulus, and hardness were enhanced considerably compared with neat epoxy resin. The results found that the inclusion of 3 wt% D‐clay in the epoxy resin showed increase in Tg of 10.09°C, 29.34% increase in tensile strength, 23.19% increase in tensile modulus, and 53.87% increase in vickers hardness compared with neat epoxy resin. The uniform dispersion of clay platelets and strong interfacial hydrogen bonding between D‐clay and epoxy matrix afforded efficient load transfer across the epoxy‐clay interface, leading to significantly improved thermal and mechanical properties. POLYM. COMPOS., 39:E2407–E2414, 2018. © 2017 Society of Plastics Engineers

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Thermally stable organically modified layered silicates based on alkyl imidazolium salts

Cited by 14 publications

References 15 publications

Polycarbonate/1‐(2‐hydroxyethyl)‐2,3‐dimethylimidazolium chloride composite membranes and short‐range chain mobility analysis

Polycarbonate/1‐(2‐hydroxyethyl)‐2,3‐dimethylimidazolium chloride composite membranes and short‐range chain mobility analysis

Adsorption of imidazolium and pyridinium ionic liquids onto montmorillonite: Characterisation and thermodynamic calculations

Achieving high thermal and mechanical properties of epoxy nanocomposites via incorporation of dopamine interfaced clay

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