Rheology and dynamics at the interface of multi micro/nanolayered polymers / Bo Lu in RHEOLOGIE, Vol. 34 (12/2018)

[article]  inRHEOLOGIE > Vol. 34 (12/2018) . - np. Titre : Rheology and dynamics at the interface of multi micro/nanolayered polymers Type de document : texte imprimé Auteurs : Bo Lu, Auteur Année de publication : 2019 Article en page(s) : np. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Couches minces multicouches Fluides, Dynamique des Matières plastiques -- Extrusion Polyamide 6 Polyfluorure de vinylidène Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Rhéologie Index. décimale : 532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) Résumé : Interphase developed at the polymer—polymer interface crucially determines the properties of multilayered polymers from coextrusion. However, a better understanding of the interfacial properties involving rheology and dynamics is still lacking. Therefore, this work is focused on a fundamental study of the role of interphase in rheology and dynamics of multilayered structures. The work proceeded from the diffuse interphase in compatible multilayered systems to the reactive interphase in reactive counterparts. Starting with a preliminary study on a model compatible system of PVDF/PMMA blends, we firstly revealed their blending phenomena and physics, involving dynamic heterogeneity in segmental and terminal scales, and locally structural heterogeneity due to the nanoscale interphase. Particularly, the local heterogeneity significantly altered the thermorheological and dynamic behaviors. Based on this, we were able to further clarify the effects of interdiffusion and diffuse interphase formation on the structure, rheology and dynamics in compatible multilayered PVDF/PMMA systems fabricated by micro-/nanolayer coextrusion. The remarkable changes in the rheological and dynamic behaviors of these compatible multilayers were explained in terms of a physical picture for interdiffusion mechanism and diffuse interphase occurring in coextrusion process. Secondly, we incorporated in-situ interfacial chemical reaction to multilayered systems based on PVDF-g-MAFI/PA6, thereby allowing us to probe the generated reactive interphase with graft copolymers from bilayer to multi nanolayers. Influence of interfacial reaction and formed interphase on the resulting macroscopic rheological behaviors and microscopic dynamics were preliminarily elaborated using a stacked model bilayer of PVDF-g-MAH/PA6, by considering the factors involving interfacial morphology, copolymer architecture and reaction extent/time, etc. Based on this preliminary investigation, we further probed the role of interfacial reaction and reactive interphase fo'imation in the coextruded multilayered structures alternating of PVDF-g-MAH/PA6 with the layer thickness varying from micro- to nanoscale. Therein, we investigated systernatically the layer architecture/structure, morphology, dielectric properties, charge transport dynamics, and especially the uniaxial extensional rheology of the reactive multilayered polymers in the presence of reactive interphase. Our findings are aimed at a better understanding of the interfacial properties including rheology, dynamics and dielectric properties, towards controlling the interface/interphase and confinement in multilayered polymers from coextrusion and for their advanced applications. Note de contenu : - EXPERIMENTAL SECTION : Materials - Sample preparation - Characterizations - RESULTS AND DISCUSSION : Dynamic heterogeneity of compatible blends based on PVDF and PMMA : composition dependence and the role of interphase - Critical role of interfacial diffusion and diffuse interphase in compatible multi micro-/nanolayered polymers based on PVDF and PMMA - Rheological and dynamic insights into the in in situ reactive interphase with graft copolymers in model bilayered polymer systems - Reactive multi micro/nanolayered polymers : structure, rheology and dynamics at the interface/interphase Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31467 [article]

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