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PVDF nanofibers effectively capturing PM2.5 and releasing anions / Liu Zhaolin in CHEMICAL FIBERS INTERNATIONAL, Vol. 69, N° 2 (06/2019)
[article]
Titre : PVDF nanofibers effectively capturing PM2.5 and releasing anions Type de document : texte imprimé Auteurs : Liu Zhaolin, Auteur Année de publication : 2019 Article en page(s) : p. 100-101 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anions
Caractérisation
Filtration
Morphologie (matériaux)
Nanofibres
Polyfluorure de vinylidèneIndex. décimale : 677.4 Textiles artificiels Résumé : Polyvinylidene fluoride (PVDF) nanofibers doped with anion powder (AP) were prepared by electrospinning to efficiently sieve PM 2.5 and robustly release anions. Fiber morphologies formed by subtly regulating the mass fraction of AP were observed using the scanning electron microscope (SEM), and the air filtration property and the anion release capacity of the PVDF nanofibers were investigated. The results show that the average fiber diameter decreases rapidly then increases with the increasing AP mass fraction. AP particles aggregate on fiber surface when the mass fraction of AP reaches 9 wt.%.The filtration efficiency and the airflow resistance rise initially and then drop. The quality factor achieves the maximum and the anion release amount enhances significantly when the mass fraction of AP is 3 wt%. Note de contenu : - EXPERIMENTAL : Materials - Preparation of PVDF nanofibers - Characterization
- RESULTS AND DISCUSSION : Morphology of the PVDF nanofibers - Air filtration property of the PVDF nanofibers - Anion release capacity of the PVDF nanofibers
- Fig. 1 : SEM images of the PVDF nanofi bers The mass fraction of AP is respectively : a) 0 wt.%, b) 3 wt.%, c) 6 wt.% and d) 9 wt.%
- Fig. 2 : Air filtration property of the PVDF nanofibers at various mass fraction of AP. a) Filtration efficiency and airflow resistance, b) quality factor
- Fig. 3 : Anion release amount of the PVDF nanofibers at various mass fraction of AP
- Table : Solution properties and average diameter of the PVDF nanofibers
En ligne : https://drive.google.com/file/d/1r6sBTExA3GY1Es6yHL9ZxoLe8dXAPCQc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32777
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Code-barres Cote Support Localisation Section Disponibilité 21014 - Périodique Bibliothèque principale Documentaires Disponible Rheology and dynamics at the interface of multi micro/nanolayered polymers / Bo Lu in RHEOLOGIE, Vol. 34 (12/2018)
[article]
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 méthyleLe 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.
RhéologieIndex. 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/interphasePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31467
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Code-barres Cote Support Localisation Section Disponibilité 20495 - Périodique Bibliothèque principale Documentaires Disponible Service life prediction of colour retention for PVDF architectural coatings with organic pigments / Kurt A. Wood in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B3 (09/2006)
[article]
Titre : Service life prediction of colour retention for PVDF architectural coatings with organic pigments Type de document : texte imprimé Auteurs : Kurt A. Wood, Auteur ; S. R. Gaboury, Auteur Année de publication : 2006 Article en page(s) : p. 231-235 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Décoloration
Durée de vie (Ingénierie)
Pigments organiques
Polyfluorure de vinylidène
Prévision, Théorie de la
Résistance aux conditions climatiques
Revêtements décoratifs:Peinture décorative
Revêtements en bâtimentIndex. décimale : 667.9 Revêtements et enduits Résumé : The decorative service life of architectural exterior coatings is often determined by the onset of large colour shifts or visible chalking of the coating. Here, the authors report three-year Florida and accelerated weathering results for a series of 70% poly(vinylidene fluoride) (PVDF) coatings made with a palette of relatively weatherable organic pigments. Many of these coatings show minimal visible colour change after three years in Florida, and 6000 hours accelerated weathering. Surprisingly, the more aggressive UV-B bulb exposure, unlike UV-A bulb exposure, shows a high degree of statistical correlation with the three-year colour shift in Florida. For most of these systems, UV absorber/HALS (hindered amine light stabiliser) packages do not improve the performance, but a 70% PVDF clear coat does. Note de contenu : - The service life prediction challenge
- Organic pigment series and test conditions
- Results for masstone coatings
- Spearman rank correlation analysis
- Results for tint coating
- Table 1 : Pigment grades used in this study
- Table 2 : System configurations tested in this study for each pigmentDOI : 10.1007/BF02699665 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699665.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5282
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Code-barres Cote Support Localisation Section Disponibilité 005574 - Périodique Bibliothèque principale Documentaires Disponible Superhydrophobic graphene/hydrophobic polymer coating on a microarc oxidized metal surface / Li Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)
[article]
Titre : Superhydrophobic graphene/hydrophobic polymer coating on a microarc oxidized metal surface Type de document : texte imprimé Auteurs : Li Li, Auteur ; Tianlu Li, Auteur ; Zhiyuan Zhang, Auteur ; Zheyu Chen, Auteur ; Chen Chen, Auteur ; Fei Chen, Auteur Année de publication : 2022 Article en page(s) : p. 1449-1456 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Frottements (mécanique)
GraphèneLe graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur.
Hydrophobie
Polyfluorure de vinylidène
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : In this work, by exploiting the lubricity and barrier effect of graphene and the hydrophobic polymer (polyvinylidene fluoride, PVDF), a superhydrophobic graphene/PVDF composite coating (G/PVDF) with contact angle of approximately 153.3° was prepared on microarc oxidized aluminum alloy to protect the substrate from friction and corrosion. The G/PVDF coating was strongly bonded with the microarc oxidization (MAO) layer on the aluminum alloy by the ionic interactions between graphene and the cations of polyelectrolyte, and hydrophobic interactions between graphene and PVDF. Results show that the friction coefficient of the G/PVDF coating was lower than that of the MAO-only ceramic coating, with the lowest friction coefficient for the G/PVDF3 film of about 0.3, which demonstrates better antiwear property compared with the MAO-only ceramic coating. In addition, the superhydrophobic coating exhibited enhanced anticorrosion properties compared with the MAO-only ceramic layer, which is attributed to the combined effect of graphene and the superhydrophobicity of the surface. Note de contenu : - Table 1 : Fitting parameters of EIS plot for MAO and G/PVDF3 after corrosion in 3.5 wt% NaCl solution
- Table 2 : The derived Tafel polarization parameters of MAO and G/PVDF3 after being immersed in 3.5 wt% NaCl solutionDOI : https://doi.org/10.1007/s11998-022-00618-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00618-w.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38282
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Code-barres Cote Support Localisation Section Disponibilité 23672 - Périodique Bibliothèque principale Documentaires Disponible Superhydrophobic surface modification for corrosion protection of metals and alloys / Viriyah Chobaomsup in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 3 (05-06/2020)
[article]
Titre : Superhydrophobic surface modification for corrosion protection of metals and alloys Type de document : texte imprimé Auteurs : Viriyah Chobaomsup, Auteur ; Martin Metzner, Auteur ; Yuttanant Boonyongmaneerat, Auteur Année de publication : 2020 Article en page(s) : p. 583–595 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Dip-coating
Electrofilature
Hexafluoropropylène
Hydrophobie
Imperméabilisation
Métaux -- Revêtements protecteurs
Mouillabilité
Polyfluorure de vinylidène
Traîtements de surfaceIndex. décimale : 667.9 Revêtements et enduits Résumé : Modifying a surface to achieve a superhydrophobic characteristic has increasingly become an attractive approach to protect oxidation of metals and alloys. This review comprehensively discusses the state of the art of superhydrophobic surface modification with a particular focus on the corrosion inhibiting quality. Generally, there are two main approaches to induce superhydrophobicity, namely application of low surface energy coating and roughening of a surface to a binary micro/nano-rough structure. These strategies, which are often combined and found to complement one another, have been successfully demonstrated to provide corrosion-resistant improvement with moderate durability for a number of metals and alloys, including stainless steels, aluminum, magnesium, titanium, copper, and zinc. Note de contenu : - BASIC THEORY OF WETTING
- MATERIALS AND FABRICATION TECHNIQUES FOR SUPERHYDROPHOBIC SURFACE : Techniques to create hierarchical binary roughness - Application of low surface energy coatings - Structures of superhydrophobic surface
- CORROSION RESISTANCE OF SUPERHYDROPHOBIC SURFACE
- ROBUSTNESS AND DURABILITY OF SUPERHYDROPHOBIC SURFACEDOI : https://doi.org/10.1007/s11998-020-00327-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00327-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34091
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Code-barres Cote Support Localisation Section Disponibilité 21734 - Périodique Bibliothèque principale Documentaires Disponible The kinetics and mechanism of the direct fluorination of polyethylenes / Alexander P. Kharitonov in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B3 (09/2005)
PermalinkThermal, tensile, electrical, dynamic mechanical thermal and rheological properties of polyvinylidene fluoride and fluoroelastomer composites filled with carbon black / M. D. Moezzi in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 1 (03/2019)
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