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Article Dans Une Revue Journal of Molecular Liquids Année : 2022

Interactions between methanol/toluene binary mixtures and an organic solvent nanofiltration PIM-1 membrane

Résumé

In this work, a molecular scale study of the interactions between a polymer with intrinsic microporosity (PIM-1) membrane and toluene, methanol and their mixtures was performed by means of molecular dynamics simulations. From the radial distribution functions we highlight specific interactions between the hydroxyl group of methanol and the aromatic ring of toluene as well as with the PIM-1 membrane. Moreover, the presence of nitrogen atoms on the PIM-1 backbone makes it possible the formation of hydrogen bonds like interaction (close contact of 2.5 Å) between the methanol molecules and the PIM-1 membrane, thus leading to interfacial anchoring of methanol at the polymer surface and moving toluene molecules away from the surface. However some toluene molecules are located around 3.5 Å due to π-stacking interaction between the aromatic rings of the PIM-1 membrane and those of the confined TOL molecules. At short range, the confined methanol molecules interact with each other like their bulk-phase counterparts whereas long range correlations highlight a existence of confined methanol aggregates. The specific interactions between toluene, methanol and the PIM-1 membrane result in a linear increase of the membrane swelling with the mole fraction of toluene in the binary mixtures. © 2022 Elsevier B.V.

Dates et versions

hal-03660979 , version 1 (06-05-2022)

Identifiants

Citer

M.-L. Ouinten, Anthony Szymczyk, Aziz Ghoufi. Interactions between methanol/toluene binary mixtures and an organic solvent nanofiltration PIM-1 membrane. Journal of Molecular Liquids, 2022, 357, pp.119146. ⟨10.1016/j.molliq.2022.119146⟩. ⟨hal-03660979⟩
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