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Designing self-stratifying coatings through the study of pigment migration / Shahdad Zahedi in SURFACE COATINGS INTERNATIONAL, Vol. 101.6 (12/2018 - 01/2019)
[article]
Titre : Designing self-stratifying coatings through the study of pigment migration Type de document : texte imprimé Auteurs : Shahdad Zahedi, Auteur ; Davood Zaarei, Auteur ; Seyed Reza Ghaffarian, Auteur ; Maude Jimenez, Auteur Année de publication : 2018 Article en page(s) : p. 288-293 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact
Dioxyde de titane
Energie de surface
Epoxydes
Formulation (Génie chimique)
Oxyde de fer
Pigments inorganiques
Revêtements autostratifiantsIndex. décimale : 667.9 Revêtements et enduits Résumé : Self-stratifying coatings are smart coatings which represent a new generation of surface coatings for industry which offer the advantages of single-coat application, thereby reducing resources and potential pollution when compared to conventinal multi-layer coating systems.
In our work, the effect of pigments on stratification was studied. Ten formulations were made based on epoxy and fluorinated vinyl ether incorporation of inorganic pigments containing titanium dioxide and red iron oxide. Evaluations were made by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX) and mapping from cross-sections through the films. Results demonstrate that the affinity of the pigments for different resins, and also the quality of their dispersion and stabilisation in the initial phase, both play important roles in the stratification phenomena.Note de contenu : - Materials
- Formulation and application
- Results and discussion : Stratification of clear coatings - Stratification of single-pigment coatings - Stratification of dual-pigment coatings
- Table 1 : Prepared formulations
- Table 2 : Percentage of elements in top and bottom areas in cross-section of clear coating formulation (Formula 3) by EDX
- Table 3 : Percentage of elements in top and bottom areas in cross-section of single-pigment formulations 4, 5, 7 and 8 by EDX
- Table 4 : Stratification type by formulation
- Table 5 : Percentage of elements in top and bottom areas in cross-section of single-pigment formulations 6, 9 and 10 by EDX
- Table 6 : Contact angle measurement and surface energies (polar and dispersive components) of films by using three liquids (water, ethylene glycol and di-iodomethane)
- Table 7 : Surface energy relations and stratification conditions
- Fig. 1 : SEM and mapping images for SSC clear coating system (formula 3)
- Fig. 2 : SEM and mapping images for single-pigment systems (formulations, 4, 5, 7 and 8)
- Fig. 3 : SEM and mapping images for dual-pigment systems (formulations 6, 9, and 10)En ligne : https://drive.google.com/file/d/11o-EpvH5VXJK-GS1nC5NArN3pTtgN975/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31651
in SURFACE COATINGS INTERNATIONAL > Vol. 101.6 (12/2018 - 01/2019) . - p. 288-293[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20581 - Périodique Bibliothèque principale Documentaires Disponible Doped TiO2 nanophotocatalysts for leather surface finishing with self-cleaning properties / Aurora Petica in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)
[article]
Titre : Doped TiO2 nanophotocatalysts for leather surface finishing with self-cleaning properties Type de document : texte imprimé Auteurs : Aurora Petica, Auteur ; Carmen Gaidau, Auteur ; Madalina Ignat, Auteur ; Claudiu Sendrea, Auteur ; Liana Anicai, Auteur Année de publication : 2015 Article en page(s) : p.1153-1163 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Cuirs et peaux -- Finition
Dioxyde de titane
Hydrophilie
Nanoparticules
Photocatalyse
Revêtement auto-nettoyantIndex. décimale : 667.9 Revêtements et enduits Résumé : TiO2 nanoparticles (TiO2NPs) doped with N and Fe, exhibiting improved photocatalytic activity in the visible light region, were prepared and then applied onto leather surfaces. Diffuse reflectance spectra measurements evidenced the shifting of the absorption peak toward visible region and the enlargement of absorption band (the so-called “tail” of the band). Absorbance spectra for a 20 ppm methylene blue (MB) solution, in the presence of 0.1% (wt%) doped TiO2NPs after 1 h under visible light irradiation, showed the high efficiency of the doping. Doped TiO2NPs were embedded in composites material based on acrylic binder, nitrocellulose lacquer, and pigmented paste and were used for leather surface finishing. Self-cleaning properties were confirmed by spectrophotometrical measurements and CIELab color coordinates recording for the degradation of MB spots applied to the treated leather surface exposed to UVA (λ = 365 nm) and visible light irradiation. Leather treated with Fe–N co-doped TiO2NPs presents the highest activity for MB spot degradation under visible light irradiation. The photographic images of MB dye spots and ball pen ink lines indicate a complete degradation after 30 h of exposure to visible light. Water contact angle measurements in dynamic conditions evidenced the photo-induced hydrophilicity process on functionalized leather surface, supporting the degradation phenomena through water and oxidative species generation. Note de contenu : - EXPERIMENTAL : Synthesis of doped titania nanopowders - Leather surface treatment - Characterization methods
- RESULTS AND DISCUSSION : Structural and morphological characterization - Optical properties of doped TiO2 nanopowders - Photocatalytic activity of the doped TiO2PNs - Self-cleaning characterization of the treated leatherDOI : 10.1007/s11998-015-9711-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9711-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24973
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p.1153-1163[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17585 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Double-edged sword : Adhesion to polyolefin surfaces represents both technical and practical challenges Type de document : texte imprimé Auteurs : Gang-Fung Chen, Auteur Année de publication : 1999 Article en page(s) : p. 29-32 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Angle de contact
Chlorure de polyvinyle
Energie de surface
Fluoropolymères
Polyéthylène
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.
PolyoléfinesUne polyoléfine, parfois appelée polyalcène, désigne un polymère aliphatique saturé, synthétique, issu de la polymérisation d'une oléfine (aussi appelée un alcène) telle l'éthylène et ses dérivés.
La formule générale est -(CH2-CRR')n-, où R et R' peuvent être l'atome d'hydrogène (H) ou les radicaux alkyle apolaires CH3, CH2-CH3, CH2-CH(CH3)2. Il existe aussi des mousses isolantes souples faites à partir de polyoléfine (pour l'isolation thermique de tuyaux plastiques par exemple).
PRESENTATION : Les polyoléfines forment la plus importante famille de matières plastiques, avec quatre représentants (PP, HDPE, LDPE, LLDPE) parmi les plastiques de grande consommation. La consommation mondiale de ces quatre polymères est évaluée à plus de 60 millions de tonnes en 20001.
Seul un petit nombre de polyoléfines a atteint le niveau industriel :
les polyoléfines thermoplastiques semi-cristallines : polyéthylène (PE), polypropylène (PP), polyméthylpentène (PMP), polybutène-1 (PB-1) ;
les polyoléfines élastomères : polyisobutylène (PIB), éthylène-propylène (EPR ou EPM) et éthylène-propylène-diène monomère (EPDM).
PROPRIETES : En raison de leur nature paraffinique, les polyoléfines sont hydrophobes et possèdent en général une grande inertie chimique (aux solvants, acides, bases, etc.). Ces matériaux ont donc une qualité alimentaire. Le collage est très difficile (la surface est particulièrement inerte, des traitements de surface spéciaux sont nécessaires).
Cependant, ils sont sensibles à l'action des UV, et résistent très peu à l'inflammation car leur indice limite d'oxygène est faible (exemple : ILO ~ 17 pour le polyéthylène).
Leur densité est très faible [0,83 (cas du PMP) < d < 0,95] : ils flottent dans l'eau.
Ils sont opaques, sauf le PMP (transparent).
Polystyrène
Polytétrafluoréthylène
Tension superficielle
ThermodynamiqueIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : Adhesion to low-energy surface substrates is an important subject which represents both technical and practical challenges. It is often desirable to develope coatings to which nothing can stick, such as those of a non-stick pan. On the other hand, it is highly desirable to develop adhesives which stick to low-energy surfaces, such as polyolefins. This area has been of increasing importance in recent years due to the rapide development of various plastic materials used in consumer products.
It will be beneficial to first define the word "adhesive". In their pioneer studies of adhesion in 1925, McBain and Hopkins reported that "any fluid which wets a particular surface and which is then converted into a tenacious mass by cooling, evaporation, oxidation, etc. must be regarded as an adhesive for that surface".
McBain and Lee later added the requirement that the adhesive must be able to deform during its solidification to release elastic stresses developed in the forming of the joing. Their work made evident the following three requirements for an adhesive : Wetting, solidification and sufficient deformability to reduce the build-up of elastic stresses in the formation of the joint.
Clearly, both thermodynamic and rheological aspects are important considerations for adhesion. Today, when we speak of adhesion, the most frequently used terms are contact angle, surface tension and surface energy. This article delas with the thermodynamic aspects of adhesion to polyolefin surfaces. Our objective is to see if we can find the most favorable thermodynamic terms to give maximum adhesion to polyolefin substrates.Note de contenu : - The young equation
- Work of adhesion
- Zisman plotEn ligne : https://drive.google.com/file/d/17BAj5eJ1kFSqXLhJjzry3FMfnbhbG8hx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20044
in ADHESIVES AGE > Vol. 42, N° 10 (10/1999) . - p. 29-32[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001448 - Périodique Bibliothèque principale Documentaires Disponible Droplet asymmetry and wetting dynamics on irregularly roughened surfaces / Kewei Shi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)
[article]
Titre : Droplet asymmetry and wetting dynamics on irregularly roughened surfaces Type de document : texte imprimé Auteurs : Kewei Shi, Auteur ; Justin Elms, Auteur ; Xili Duan, Auteur ; Kristin M. Poduska, Auteur Année de publication : 2021 Article en page(s) : p. 911-919 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Caractérisation
Gouttelettes
Métaux -- Surfaces
Mouillage (chimie des surfaces)
RugositéIndex. décimale : 667.9 Revêtements et enduits Résumé : This study illustrates pervasive challenges in studying wetting dynamics, including dynamic contact angles, on irregularly roughened surfaces. We demonstrate that asymmetric water droplet shapes occur more than 50% of the time during static and dynamic contact angle measurements on sandblasted Zn-plated stainless steel with a polymeric overcoat. The pinning that causes the asymmetric drop shape distortion on horizontal surfaces also influences the sliding behavior on inclined surfaces. These effects lead to a poor correlation between the measured dynamic contact angles and the observed sliding angles (critical tilt angles). Our work emphasizes that large variations in the values of these dynamic wetting parameters are inherent to the heterogeneity of the surface roughness, and thus they limit the usefulness of standard dynamic wetting criteria. These findings have implications for academic and industrial research focused on making coated materials that have consistent wettability properties throughout their usage life cycle. Note de contenu : - EXPERIMENTAL METHOD : Materials - Dynamic contact angle measurements - Data processing and fitting
- RESULTS AND DISCUSSION : Surface characterization - Volume-modified droplets (horizontal surfaces) - Sliding droplets (inclined surfaces) - Comparison with the Furmidge model
- Table 1 : Comparison of acceptable measurements, as a function of data fitting rates, during volume modification contact angle measurements of 20 µL dropletsDOI : https://doi.org/10.1007/s11998-020-00456-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00456-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35939
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Code-barres Cote Support Localisation Section Disponibilité 22785 - Périodique Bibliothèque principale Documentaires Disponible Dual approach of bimodality and nano-reinforcement towards toughened PDMS based foul release coatings / Sangram K. Rath in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)
[article]
Titre : Dual approach of bimodality and nano-reinforcement towards toughened PDMS based foul release coatings Type de document : texte imprimé Auteurs : Sangram K. Rath, Auteur ; S. Praveen, Auteur ; Jayesh G. Chavan, Auteur ; Srikanth Billa, Auteur ; T. Umasankar Patro, Auteur ; Manoranjan Patri, Auteur Année de publication : 2021 Article en page(s) : p. 871-885 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Argile
Caractérisation
Dispersions et suspensions
Mouillabilité
Nanoparticules
PolydiméthylsiloxaneLe polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones.
Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone.
Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK).
La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones.
Renfort minéral
Revêtements -- Propriétés mécaniques
Revêtements antisalissuresIndex. décimale : 667.9 Revêtements et enduits Résumé : It is well established that crosslinked polydimethylsiloxane (PDMS) based coatings have efficacious foul release characteristics. However, a trade-off between mechanical integrity of filled and crosslinked PDMS based coatings and their foul release performance has been a bottleneck for producing efficient and durable coatings. In the present study, we report a dual approach of nano-reinforcement of a bimodal PDMS network as a strategy to produce simultaneously reinforced and toughened PDMS networks with facile release of macrofoulants from their surfaces. The nanocomposites of both unimodal and bimodal PDMS networks were prepared using oligomeric dihydroxyl functional PDMS precursor chains differing in their molecular weights by a factor of five and commercial Cloisite-20A nanoclay as the nanofiller. The clay layers were found to be mildly intercalated in the PDMS matrix, as revealed from investigations by scattering and imaging techniques at different length scales. While the unimodal PDMS networks did show nanoclay induced simultaneous reinforcement and toughening, at equivalent clay loadings, the bimodal PDMS nanocomposites seemed to stretch further with characteristic strain hardening before fracture. Dynamic mechanical analysis (DMA) and swelling studies of the nancomposites further confirmed the nanoclay induced reinforcement effect of the bimodal PDMS host matrix. The intrinsic low surface energy characteristics of PDMS were retained by bimodal blending of long and short chains and its subsequent nano-reinforcement. Macrofouling studies by panel immersion and release force measurements revealed that the macrofoulants could be dislodged from the nanocomposite coatings with a shear force < 0.05 MPa. Note de contenu : - EXPERIMENTAL : Materials - Preparation of unimodal and bimodal PDMS networks and their nanocomposites - Characterization techniques
- RESULTS AND DISCUSSION : Clay dispersion morphology - Surface wettability
- MECHANICAL PROPERTIES
- SWEELING STUDIES : Macrofouling and foul release characteristics
- Table 1 : Contact angle and surface energy of pristin unimodal and bimodal PDMS networks and their nanocomposites
- Table 2 : Tensile properties of unimodal and bimodal PDMS networks and their nanocomposites at different clay loadingsDOI : https://doi.org/10.1007/s11998-020-00450-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00450-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35936
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