Influence of small amounts of water and ethanol on Na+-montmorillonite solid-state modification by inorganic and organic intercalants

Khar’kova, E. M.; Mendeleev, D. I.; Левин, И. С.; Sorokin, S. E.; Gerasin, V. A.

doi:10.1016/j.clay.2020.105734

Cited by 8 publications

(1 citation statement)

References 30 publications

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“…Smectite clays are composed of negatively charged aluminosilicate layers that are compensated by counterions present in the interlayer region. These clay minerals have a significant role to play in geological storage of CO 2 , − shale gas production, − nuclear waste management, , and preparation of organoclays. − The effectiveness of the CO 2 trapping can be significantly influenced by the cap rock (e.g., shale rich in clay). The organoclays containing organic cations and expanded interlayer spacings can readily produce the polymer–clay nanocomposites by intercalation and/or exfoliation.…”

Section: Introductionmentioning

confidence: 99%

Molecular Simulation Study of Montmorillonite in Contact with Ethanol

Cui

Nair

Yang

et al. 2023

Ind. Eng. Chem. Res.

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Molecular simulations were performed to explore the adsorption and transport mechanism of ethanol and ions in Na– and Ca–montmorillonite clays. Our results show that the uptake of ethanol by montmorillonite increases with increasing relative pressure (RP)/basal d-spacing, consistent with experimental observations. The basal d-spacing of montmorillonite grows in the presence of ethanol to about 13.0 Å with a monolayer arrangement of ethanol (1L). Further uptake of ethanol allows the basal d-spacing to grow to about 16.5 Å with a bilayer arrangement of ethanol (2L). For a given solvation state, the amount of ethanol uptake is almost independent of RP and the type of the counterion. The stable basal d-spacings of the montmorillonite + ethanol system are larger than those of the montmorillonite + water system. Also, the swelling transitions are relatively shifted to higher RP values in the montmorillonite + ethanol system. This may be because the clay has a weaker affinity for the less polar ethanol molecules as compared with water. The mobility of ethanol and ions in the interlayers increases with increasing RP due to the associated swelling of montmorillonite. For a given solvation state, the mobility of these species is almost unaffected by changes in RP, as in the case of adsorption. The mobility of ethanol and ions in the 1L and 2L states is about 3 orders of magnitude lower than that in the bulk. The species mobility in the montmorillonite + ethanol system is generally much lower than those in the montmorillonite + water system. This may be attributed to the higher steric hindrance in the alcohol molecules. However, the mobility of the Ca2+ ion in the 1L state is almost similar in both the montmorillonite + ethanol and the montmorillonite + water systems. This is possibly due to the stronger Ca2+–clay interactions in the 1L state.

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Section: Introductionmentioning

confidence: 99%

Molecular Simulation Study of Montmorillonite in Contact with Ethanol

Cui

Nair

Yang

et al. 2023

Ind. Eng. Chem. Res.

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An efficient method to prepare high grafting montmorillonite with silane coupling agent and its improvements for styrene butadiene rubber composites

Peng,

Li,

Wang

et al. 2024

Polymer Composites

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The quantity of silane chemically bonded to the organoclay's surface significantly influences its dispersion within the polymer matrix, as well as the interfacial interaction. This research presents a groundbreaking method for enhancing the surface properties of montmorillonite (Mt) through the use of γ‐(methacryloxy) propyl trimethoxy silane (KH570) coupled with acid treatment, leading to increased grafting efficiency. Confirmed by FT‐IR, TGA, and XRD, the process effectively bonds organo‐silanes to Mt and achieves a high grafting level of 1.59 mequiv/g. Utilizing a latex compounding method, Mt/rubber nanocomposites are synthesized with thoroughly modified clay for peak performance. Dispersion and interfacial properties are evaluated through XRD, TEM, AFM, and DMTA. The findings reveal that the well‐modified Mt is an exceptional filler, ensuring a high level of dispersion and robust interaction with the rubber matrix. This synergy translates to a marked improvement in the mechanical properties of the composite, with notable enhancements observed in both tensile strength and elongation at break of 9.7 MPa and 1141%, respectively. This innovative approach to the graft modification of clays presents a potent method, offering the potential for the industrial‐scale manufacture of high‐performance clay‐based composites.Highlights A processing method for preparing high grafting clay with a silane coupling agent. Functionalized clay presents better nano‐dispersion in the polymeric matrix. Strong covalent interfacial interaction is constructed between clay and rubber. Tensile Strength and elongation at break of the composites are obliviously improved.

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