Shear orientation of nematic phases of clay nanosheets : processing of barrier coatings / Maximilian Röhrl in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 2 (03/2022) . - p. 487-495 Titre : Shear orientation of nematic phases of clay nanosheets : processing of barrier coatings Type de document : texte imprimé Auteurs : Maximilian Röhrl, Auteur ; Judith H. Mettke, Auteur ; Sabine Rosenfeldt, Auteur ; Holger Schmalz, Auteur ; Ulrich Mansfeld, Auteur ; Renee L. Timmins, Auteur ; Christoph Habel, Auteur ; Josef Breu, Auteur ; Franz Durst, Auteur Année de publication : 2022 Article en page(s) : p. 487-495 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argile Caractérisation Dispersions et suspensions Enduction par filière Matériaux -- Propriétés barrières Matières plastiques -- Revêtement Nanoparticules Oxygène Perméabilité Polyéthylène téréphtalate Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : When suspensions are exposed to shear forces, the particles may form ordered structures depending on their shapes, concentrations, and the material. For some processes, e.g., for wet-film coating, it is important to know how fast these structures form in shear fields and for how long the structures persist when the shear is relaxed. To obtain information on the particle structure formation and the decay time, the effective viscosity of nematic suspensions of Na-hectorite nanosheets was investigated by rheology employing a cone-plate measurement geometry. The necessary time for the formation textured nematic films could be deduced by carrying out effective viscosity measurements at constant time steps. Information could also be obtained on the lifetime of the platelet textures when shear is relaxed. All this information was employed to identify geometrical requirements for slot dies to produce barrier liners with nanosheet layers oriented parallel to PET substrates. Thereby, we obtained green and simple coatings that are in line with state-of-the-art high-performance materials such as metalized plastic foils in terms of oxygen barrier properties. Note de contenu : - EXPERIMENTAL : Materials and sample preparation - Characterization methods - Coating experiments - RESULTS AND DISCUSSION : Shear orientation of NaHec nanosheets - Slot die coating - Table 1 : OTRs of slot die coated NaHec films (1.5 µm) measured at 23°C and different r.h. DOI : https://doi.org/10.1007/s11998-021-00535-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00535-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37280 [article]

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