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Homogeneous dispersion of cellulose/graphite oxide nanofibers in water-based urushiol coatings with improved mechanical properties and corrosion resistance / Lei Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)
[article]
Titre : Homogeneous dispersion of cellulose/graphite oxide nanofibers in water-based urushiol coatings with improved mechanical properties and corrosion resistance Type de document : texte imprimé Auteurs : Lei Zhang, Auteur ; Haitang Wu, Auteur ; Chonglin Zhao, Auteur ; Lingce Kong, Auteur ; Xiaohua Huang, Auteur Année de publication : 2023 Article en page(s) : p. 1649-1660 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Caractérisation
CelluloseLa cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules.
Greffage (chimie)
Matériaux hybrides
Nanofibres
Oxyde de graphène
Revêtements -- Propriétés mécaniques
Revêtements en phase aqueuse
Revêtements organiques
UrushiolL’urushiol est une toxine organique que l'on trouve dans les plantes de la famille des Anacardiaceae, spécialement dans le genre Toxicodendron (par exemple le sumac grimpant en Amérique du Nord). Il provoque des allergies de la peau ou dermatites, pouvant être importantes, au contact de ces plantes. Le nom vient du mot japonais urushi (漆?), qui désigne une laque produite dans l'Asie orientale à partir du suc des arbres kiurushi (arbre à laque). L'oxydation et la polymérisation de l'urushiol dans le suc de l'arbre en présence d'humidité permet de former une laque dure utilisée traditionnellement pour produire des objets d'art laqués en Chine et au Japon.Index. décimale : 667.9 Revêtements et enduits Résumé : A polymeric coating based on a reactive urushiol-based polymeric emulsion was synthesized by grafting cellulose nanofibers (CNF) and graphene oxide (GO) onto the urushiol backbone, followed by phase inversion to obtain a cellulose nanofiber-graphene oxide/water-based urushiol emulsion (GO-CNF/WU). Following silane treatment (APTES), well-dispersed CNF-GO composites were obtained due to molecular interactions at the interface (including covalent, π-π and hydrogen bonding) between CNF and GO, resulting in a WU polymer which served as a mixing matrix to stabilize and improve the resulting GO-CNF through chemical-crosslinking. As expected, the mechanical properties (hardness and adhesion) and anticorrosion protection of the WU films were improved considerably after incorporating GO-CNF composites at fairly low concentrations. Compared to the WU film, the coated tinplate with the GO-CNF/WU coating displayed higher anticorrosion efficiency, with a PE of 99%. In addition, the pencil hardness of the GO-CNF/WU coatings increased significantly, from 2 to 6H, and adhesion was remarkably enhanced from grade 6 to 1 after the addition of 10% MGO to the films. Due to the synergistic protective effect of CNF and GO, the method may represent a facile and environmentally friendly approach to integrate multi-nanoscale blocks into WU polymer with excellent mechanical properties and corrosion resistance. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of GO-CNF suspensions - Preparation of the water-based O/W urushiol emulsion - Film preparation - Characterization of the GO-CNF/WU composite coating
- RESULTS AND DISCUSSION : FTIR characterization - XRD characterization - XPS analysis - Micromorphology of WU films - Electrochemical behavior - Mechanical properties
- Table 1 : Atomic concentrations and relative carbon composition of samples
- Table 2 : Impedance measurements and protection efficiencies of WU coatings containing GO and CNF in 3.5% NaCl at 25°C
- Table 3 : Mechanical properties of pure WU, GO/WU, CNF/WU and GO-CNF/WU composite coatingsDOI : https://doi.org/10.1007/s11998-023-00770-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00770-x.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39978
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 5 (09/2023) . - p. 1649-1660[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24242 - Périodique Bibliothèque principale Documentaires Disponible Hybrid multilayer thin-film fabrication by atmospheric deposition process for enhancing the barrier performance / Srikanth Jagadeesan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)
[article]
Titre : Hybrid multilayer thin-film fabrication by atmospheric deposition process for enhancing the barrier performance Type de document : texte imprimé Auteurs : Srikanth Jagadeesan, Auteur ; Jong Hwan Lim, Auteur ; Kyung Hyun Choi ; Yang Hoi Doh Année de publication : 2018 Article en page(s) : p. 1391-1399 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces multicouches
Dépôt de couches minces atomiques
Matériaux -- Propriétés barrières
Morphologie (matériaux)
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés optiques
Surfaces -- Analyse
Traitement rouleau à rouleauIndex. décimale : 667.9 Revêtements et enduits Résumé : In this paper, a multilayer barrier thin film, based on polyvinylidene difluoride (PVDF)–silicon dioxide (SiO2), has been fabricated on a PET substrate through a novel method of joint fabrication techniques. The inorganic SiO2 thin film was deposited using a roll-to-roll atmospheric atomic layer deposition system (R2R-AALD), while the organic PVDF layer was deposited on the surface of SiO2 through the electrohydrodynamic atomization (EHDA) technique. The multilayer barrier thin films exhibited very good surface morphology, chemical composition, and optical properties. The obtained values for arithmetic surface roughness and water contact angle of the as-developed multilayer barrier thin film were 3.88 nm and 125°, respectively. The total thickness of the multilayer barrier thin film was 520 nm with a high optical transmittance value (85–90%). The water vapor transmission rate (WVTR) of the barrier thin film was ~ 0.9 × 10−2 g m−2 day−1. This combination of dual fabrication techniques (R2R-AALD and EHDA) for the development of multilayer barrier thin films is promising for gas barrier applications. Note de contenu : - EXPERIMENTAL DETAILS : Materials and method - Roll-to-roll atmospheric atomic layer deposition of SiO2 - PVDF deposition through EHDA technique - Characterization
- RESULTS AND DISCUSSION : Surface morphology - Compositional analysis - Optical properties - Barrier properties - Mechanical propertyDOI : 10.1007/s11998-018-0090-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0090-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31356
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1391-1399[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20388 - Périodique Bibliothèque principale Documentaires Disponible Hydrophilic nano-SiO2/PVA-based coating with durable antifogging properties / Guoqiang Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 5 (09/2020)
[article]
Titre : Hydrophilic nano-SiO2/PVA-based coating with durable antifogging properties Type de document : texte imprimé Auteurs : Guoqiang Wu, Auteur ; Yuling Yang, Auteur ; Yongtong Lei, Auteur ; Dapeng Fu, Auteur ; Yuchao Li, Auteur ; Yanhu Zhan, Auteur ; Jinming Zhen, Auteur ; Mouyong Teng, Auteur Année de publication : 2020 Article en page(s) : p. 1145–1155 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Caractérisation
Chimie des surfaces
Dioxyde de silicium
Essais (technologie)
Hydrophilie
Mélanges (chimie)
Morphologie (matériaux)
Mouillabilité
Polyacétate de vinyle
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés optiques
Revêtements anti-buée
TransmittanceLa transmittance, en général, est le rapport caractérisant la transmission d'une grandeur dans un système. Elle se calcule par le rapport entre la grandeur en entrée et en sortie.
En optique, la transmittance d'un matériau ou d'un filtre est la fraction du flux lumineux le traversant. Elle est également nommée facteur de transmission mais aussi transparence dans le domaine de la photographie.Index. décimale : 667.9 Revêtements et enduits Résumé : Hydrophilic SiO2/poly(vinyl alcohol) (PVA) coating prepared by solution blended method showed high light transmittance and durable antifogging performance. The effects of SiO2 content and pH value of SiO2 suspension on the morphology and properties of hydrophilic coating were studied by Fourier transform infrared spectroscopy, scanning electron microscopy, atomic force microscopy, contact angle test, ultraviolet visible light spectrophotometer, and antifogging test. Results showed that the PVA had good compatibility with nano-SiO2 because of the formation of Si–O–C chemical bond at the interface between nano-SiO2 and PVA. When prepared at pH = 7, SiO2/PVA coatings (SiO2/PVA mass ratio of 0.8) were hydrophilic, with a water contact angle of 22.9°, and exhibited papilla-like surface features (RMS = 7.6 nm). Polyethylene (PE) samples coated with this SiO2/PVA film exhibited a light transmittance of up to 90%, between 560 and 700 nm, and remained fog-free for more than 1 month after exposure to water at 60°C (QB/T 4475-2013 standard). Water-resisting and wear-resisting tests revealed that antifogging coatings demonstrated excellent mechanical properties. Note de contenu : - EXPERIMENTAL : Material - Preparation - Characterization
- RESULTS AND DISCUSSION : Chemical composition - Surface morphology - Surface wettability - The fogging test and optical properties - The mechanical propertiesDOI : https://doi.org/10.1007/s11998-020-00338-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00338-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34563
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 5 (09/2020) . - p. 1145–1155[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22303 - Périodique Bibliothèque principale Documentaires Disponible Hydroxyphenyl-s-triazines : advanced multipurpose UV-absorbers for coatings / Christian Schaller in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 1 (03/2008)
[article]
Titre : Hydroxyphenyl-s-triazines : advanced multipurpose UV-absorbers for coatings Type de document : texte imprimé Auteurs : Christian Schaller, Auteur ; Daniel Rogez, Auteur ; Adalberg Braig, Auteur Année de publication : 2008 Article en page(s) : p. 25-31 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbants et adsorbants
Absorbeurs de rayonnement ultraviolet
Bois -- Revêtements:Bois -- Peinture
Bois -- Vernis
Caoutchouc
Phénols
Photostabilité
Polyacryliques
Polyalkydes
Revêtements -- Additifs:Peinture -- Additifs
Revêtements -- Propriétés mécaniques
Revêtements poudre:Peinture poudre
Stabilisants (chimie)
ThermoplastiquesUne matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire.Index. décimale : 667.9 Revêtements et enduits Résumé : In recent years, the industry has succeeded in achieving adequate performance of coatings for automotive, industrial, and decorative applications, both in terms of mechanical and aesthetical properties. Nevertheless, there is an increasing demand for novel light stabilizers which can meet even today's higher performance and quality requirements as well as cost pressures. It is well known, for example in the automotive industry, that UV-absorbers (UVA) based on hydroxyphenyl-s-triazines (HPT) are capable of fulfilling these requirements where 2-(2-hydroxyphenyl)-benzotriazoles (BTZ) tend to fail or show inferior properties. Besides the well-known HPT for automotive applications, other high-performance products have been developed for an even broader range of applications comprising, for example, thin- or reduced-film applications, powder coatings, and extremely durable wood coatings. New encapsulation techniques make it even possible to convert most of these hydrophobic products into highly compatible and stable water-based product forms. This opens the door for the advanced HPT UVA for a broad range of possible waterborne and solventborne DOI : 10.1007/s11998-007-9025-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9025-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3611
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Code-barres Cote Support Localisation Section Disponibilité 009979 - Périodique Bibliothèque principale Documentaires Disponible Hyperbranched polyurethane based high-solid protective coating for marine application / R. Baloji Naik in PAINTINDIA, Vol. LXVIII, N° 12 (12/2018)
[article]
Titre : Hyperbranched polyurethane based high-solid protective coating for marine application Type de document : texte imprimé Auteurs : R. Baloji Naik, Auteur ; G. Gunasekaran, Auteur ; D. Ratna, Auteur Année de publication : 2018 Article en page(s) : p. 53-66 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion
Anticorrosifs
Anticorrosion
Essais accélérés (technologie)
Essais dynamiques
Formulation (Génie chimique)
Haut extrait sec
Marines (peinture)
Pigments inorganiques
Polymères ramifiés
Polyuréthanes
Résistance aux conditions climatiques
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements antisalissures:Peinture antisalissures
Revêtements bi-composant:Peinture bi-composant
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : High-solid two-pack paint formulations based on hyperbranched alkyd polyol (HBA) and isocyanate curing agents were developed for high performance exterior coating application. The base component consists of a hyperbranched alkyd polyol (HBA) resin and a mixture of pigments like titanium dioxide, yellow iron oxide, carbon black and talc. The pigments were dispersed in the HBA resin using a ball milI for a period of 6 - 7 h. The base component is then cured separatly with two different types of isocyanate curing agents such as aliphatic isocyanate (Desmodur N3390) and cycloaliphatic isocyanate (Desmodur Z4470). These experimental paint compositions were applied on mild steel specimens coated with epoxy red oxide primer (two coats of primer and two coats of exterior grey paint). The coating systems were evaluated for adhesion, tensile, corrosion and weathering resistance properties. For comparison, specimens of the conventional (silicone alkyd) paint was also prepared and tested. Results indicate that the developed coating composition have superior mechanical, corrosion resistance and weathering resistance properties compared to the conventional silicone alkyd coating. Note de contenu : - EXPERIMENTAL : Materials - Design of HBUA based high solid paint formulations - Mechanical properties - Adhesion strength - Evaluation of resistance to accelerated weathering - Evaluation of corrosion resistance property under different exposure conditions - Electrochemical impedance spectroscopy (EIS)
- RESULTS AND DISCUSSION : Physical properties - Mechanical properties - Abrasion, scratch, impact resistance and flexibility tests - Adhesion strength - Accelerated weathering test - Accelerated corrosion test - Electrochemical impedance spectroscopyEn ligne : https://drive.google.com/file/d/1bTS6N1nH82_lqCplbUj3uv8mXD11kQXi/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31933
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