Films de Langmuir de polymères
The Langmuir film method is used to study the effect of 2D confinement on polymer blends mixing behavior, to synthesize two-dimensional IPN or to study the structure-conductivity relationship of conducting polymers. The films, with monomolecular thickness and controlled density, are studied at the air-water interface then transferred to solid substrate to obtain polymer nanocoatings.
Key words: Langmuir-Blodgett, phase separation, structure, morphology
F. Haroun, A. El Haitami, P. Ober, E. H. G. Backus, S. Cantin; Polymer 257, 125271 (2022). https://doi.org/10.1016/j.polymer.2022.125271
A.-S. Vaillard, A. El Haitami, L. B. Dreier, P. Fontaine, F. Cousin, P. Gutfreund, M. Goldmann, E. H. G. Backus, S. Cantin; Langmuir 38, 2538-2549 (2022). https://doi.org/10.1021/acs.langmuir.1c03084
H. Fernandez, A. El Haitami, S. Spagnoli, P. Fontaine, S. Cantin. Macromolecules 57, 7184–7196 (2024). https://doi.org/10.1021/acs.macromol.4c00994
H. Fernandez, A. El Haitami, A. Hemmerle, C. Shen, P. Jordt, R. P Giri, P. Fontaine, S. Cantin. Polymer 294, 126719 (2024). https://doi.org/10.1016/j.polymer.2024.126719
- The behavior of several 2D polymer blends turned out significantly different from the one in volume. For exemple, by combining a polymer with a hydrophobic character (polybutadiene or PDMS) and a quite hydrophilic polymer (cellulose derivative), miscibility has been evidenced on a range of composition or surface pressure p whereas in 3D, a phase separation occurs for all proportions. The work continues in the framework of the IPNanocoat ANR with the building of p-composition phase diagrams for a large range of polymer couples both experimentally and theoretically .
- The synthesis of 2D semi-IPN and IPN is developed at the air-water interface, by combining for example free radical cross-linking and acetalization. The control of the cross-linking reactions and surface pressure has led to different morphologies and, in some conditions, phase separation is prevented, as in 3D. Polymer nanocoatings, stabilized by cross-linking, are currently developed (ANR IPNanocoat).
- The relationship between structure, morphology and conductivity properties of electronically conducting polymer ultra-thin films formed at the air-water interface is studied. For example, 4 nm-thick highly organized bilayers of poly(3-hexylthiophene) in situ doped have been obtained.
Key words: Langmuir-Blodgett, phase separation, structure, morphology
Selection of recent papers (or patents)
F. Haroun, A. El Haitami, P. Ober, E. H. G. Backus, S. Cantin; Polymer 257, 125271 (2022). https://doi.org/10.1016/j.polymer.2022.125271
A.-S. Vaillard, A. El Haitami, L. B. Dreier, P. Fontaine, F. Cousin, P. Gutfreund, M. Goldmann, E. H. G. Backus, S. Cantin; Langmuir 38, 2538-2549 (2022). https://doi.org/10.1021/acs.langmuir.1c03084
H. Fernandez, A. El Haitami, S. Spagnoli, P. Fontaine, S. Cantin. Macromolecules 57, 7184–7196 (2024). https://doi.org/10.1021/acs.macromol.4c00994
H. Fernandez, A. El Haitami, A. Hemmerle, C. Shen, P. Jordt, R. P Giri, P. Fontaine, S. Cantin. Polymer 294, 126719 (2024). https://doi.org/10.1016/j.polymer.2024.126719