Structure and Dynamics of Cationic Surfactants Intercalated in Synthetic Clays

Müller, Renate; Hrobáriková, Jana; Calberg, Cédric; Jérôme, Robert; Grandjean, Jean

doi:10.1021/la0304058

Cited by 29 publications

(69 citation statements)

References 23 publications

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“…In the previous work, continuous-wave electron paramagnetic resonance (CW EPR) and 31 P magic angle spinning (MAS) NMR were introduced to study the dynamics of surfactant layers, [7][8][9] since the combination of solid-state NMR and EPR is well suited to characterize molecular dynamics over time scales from milliseconds to picoseconds. [10][11][12][13][14] Dynamic heterogeneity of surfactant layers in organoclays based on Somasif and in their nanocomposites with polystyrene (PS) was observed.…”

Section: Full Papermentioning

confidence: 99%

“…First, the hydrothermal synthesis and characterization of magadiite and organomagadiite are briefly introduced. Results for the surfactant content of the OLS obtained by thermal gravimetric analysis (TGA) and by 31 P single pulse MAS NMR are compared. The section on preparation techniques concludes with a discussion of melt intercalation tests with polymers depending on different dielectric constants and based on OLS with hexadecyltrimethylammonium chloride (HTMA) and hexadecyltributylphosphonium bromide (HTBP) surfactants.…”

Section: Full Papermentioning

confidence: 99%

“…Assuming that the surfactant is completely decomposed to gaseous products in air at 900 8C, the amount of surfactant can be calculated from the difference in the weight losses of magadiite and organomagadiite. For the phosphonium surfactant HTBP, the reliability of TGA results was checked by 31 P single pulse solid-state MAS NMR. The amount of HTBP is calculated by the integration of the signal from organomagadiite and ADHP, admixed in a known ratio (e.g., 4:1 in wt).…”

Section: Amount Of Absorbed Surfactants In Organomagadiitesmentioning

confidence: 99%

“…A repetition time of 1 800 s was used in these experiments to attain a complete relaxation. [8] Temperature-dependent 31 P NMR measurements from 300 to 400 K in 10 K increments were performed with a repetition time of 60 s for the organomagadiite.…”

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Molecular Motion in Surfactant Layers Inside Polymer Composites with Synthetical Magadiite

Mao

Schleidt

Zimmermann

et al. 2007

Macro Chemistry & Physics

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Clays used in polymer‐layered silicate nanocomposites are heterogeneous. To improve insight into structure and dynamics of the interface, the iron‐free and structurally homogeneous layered silicate magadiite was synthesized. Morphology of the magadiite and the extent of intercalation in melt‐prepared composites were characterized by SEM and WAXS. Carbonyl groups in the main chain of the polymer appear to facilitate intercalation. Surfactant motion was studied by 2H NMR and CW EPR. Nanocomposite formation with PCL enhances and microcomposite formation with PS diminishes motion. The activation energies change at the glass transition temperature of PS and the melting temperature of PCL.magnified image

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Section: Full Papermentioning

confidence: 99%

Section: Full Papermentioning

confidence: 99%

Section: Amount Of Absorbed Surfactants In Organomagadiitesmentioning

confidence: 99%

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confidence: 99%

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Molecular Motion in Surfactant Layers Inside Polymer Composites with Synthetical Magadiite

Mao

Schleidt

Zimmermann

et al. 2007

Macro Chemistry & Physics

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“…Inorganic cations, however, can be replaced with various organic species such as quaternary alkylammonium cations, to modify properties of smectite and to increase its surface hydrophobicity [1][2][3]. The amount, configuration and mechanism of interaction of the organic cations with the smectite surface depend on the layer charge, on the type of alkylammonium cation used, on the molar ratio clay mineral/organic cation and the method of preparation [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The effect of layer charge and exchangeable cations on sorption of biphenyl on montmorillonites

2009

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Abstract:Montmorillonies separated from the bentonites SAz-1 (Cheto, AZ, USA), and Cressfield (New South Wales, Australia) were used as starting materials. Reduced charge montmorillonites (RCMs) were prepared from these chemically different and Li-saturated montmorillonites via heating at temperatures in the range of 120-300°C. The residual exchangeable Li + cations were then replaced with tetramethylammonium (TMA + ) or hexadecyltrimethylammonium (HDTMA + ) cations and the ability of the modified montmorillonites to adsorb biphenyl was investigated. Lower adsorption was observed for Li-montmorillonites than for the organoclays. The extent of adsorption was dependent on both the layer charge of montmorillonite and the size of alkylammonium cations. HDTMA-forms prepared from unheated Li-montmorillonites adsorbed biphenyl better than the organoclays prepared from RCMs. In contrast, the TMA-samples prepared from the Li-montmorillonites that were not heated showed low uptake of biphenyl probably due to high content of TMA + cations. Reduction of the layer charge, resulting in lower content of TMA + cations, increased sorption efficiency of both TMAmontmorillonites. The best adsorbents of biphenyl were HDTMA-SAz-1 prepared from the unheated Li-SAz-1 and TMA-Cressfield prepared from the Li-form heated at 180°C. These samples removed about 80% of biphenyl from its aqueous solutions © Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Effect of Ionic Liquid Modified Synthetic Layered Silicates on Thermal and Mechanical Properties of High Density Polyethylene Nanocomposites

Livi

Duchet‐Rumeau

Gérard

2014

Macromolecular Symposia

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International audienceIn this work, synthetic layered silicates denoted Somasif ME-100 and Laponite (R) RD were modified with dialkyl imidazolium and alkyl phosphonium ionic liquids by cationic exchange reaction. In both cases, the phosphonium (P-ME, P-RD) or imidazolium ion (I-ME, I-RD)-treated micas and laponites display an excellent thermal stability compared to commonly used quaternary ammonium salts. To highlight the effect of these ionic liquids, the modified layered silicates were introduced in a high density polyethylene (HDPE). Thus, polyethylene nanocomposites filled with a low amount of nanoparticles (2 wt%) were prepared by twin screw extrusion. Then, transmission electronic microscopy (TEM) analysis has been used to investigate the effect of ILs on the different morphologies of these nanocomposites. In addition, the use or not of compatibilizer such as PEgMA (20% by weight) has been also studied on the mechanical behaviour of these polymer nanocomposites. Even though the thermal stability of polyethylene matrix remains unchanged, a good stiffness-thoughness compromise has been observed

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Structure and Dynamics of Cationic Surfactants Intercalated in Synthetic Clays

Cited by 29 publications

References 23 publications

Molecular Motion in Surfactant Layers Inside Polymer Composites with Synthetical Magadiite

Molecular Motion in Surfactant Layers Inside Polymer Composites with Synthetical Magadiite

The effect of layer charge and exchangeable cations on sorption of biphenyl on montmorillonites

Effect of Ionic Liquid Modified Synthetic Layered Silicates on Thermal and Mechanical Properties of High Density Polyethylene Nanocomposites

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