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Graphene oxide/waterborne polyurethane nanocoatings : effects of graphene oxide content on performance properties / C. Bernard in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)
[article]
Titre : Graphene oxide/waterborne polyurethane nanocoatings : effects of graphene oxide content on performance properties Type de document : texte imprimé Auteurs : C. Bernard, Auteur ; D. G. Goodwin, Auteur ; X. Gu, Auteur ; M. Celina, Auteur ; M. Nyden, Auteur ; D. Jacobs, Auteur ; L. Sung, Auteur ; T. Nguyen, Auteur Année de publication : 2020 Article en page(s) : p. 255-269 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Adsorption
Caractérisation
Charges (matériaux)
Inflammabilité
Matériaux hybrides
Oxyde de graphène
Oxygène
Perméabilité
Polymères en émulsion
Polyuréthanes
Revêtements -- Propriétés mécaniques
Revêtements en phase aqueuse
Revêtements organiques
ThermocinétiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Graphene oxide (GO) is a good nanofiller candidate for waterborne coatings because of its outstanding physical and mechanical properties, good dispersibility in water, and low cost relative to graphene. Here, we report on the performance of a one-part, waterborne polyurethane (WPU) nanocoating formulated with four different GO loadings ([0.4% to 2.0%] by mass). The degree of GO dispersion/adhesion was evaluated using scanning electron microscopy, laser scanning confocal microscopy, and Raman microscopy. Nanocoating performance was evaluated using a dynamic mechanical thermal analyzer for mechanical properties, a customized coulometric permeation apparatus for oxygen barrier properties, a combustion microcalorimeter for flammability, a hot disk analyzer for thermal conductivity, thermogravimetric analysis for thermal stability, and a moisture sorption analyzer for water uptake. The results show that GO sheets were well dispersed in, and have good adhesion to, WPU. At the higher mass loadings ([1.2% or 2%] by mass), GO increased the modulus and yield strength of WPU by 300% and 200%, respectively, increased the thermal conductivity by 38%, reduced the burning heat release rate (flammability) by 43%, and reduced the oxygen permeability by up to sevenfold. The presence of GO, however, increased water vapor uptake at high humidity; the moisture content of 2% mass loading GO/WPU nanocoatings at 90% RH was almost twice that of the moisture content for unfilled WPU. Overall, with the exception of water uptake at very high humidity (> 70% RH), the observed improvements in physical and mechanical properties combined with the ease of processing suggest that GO is a viable nanofiller for WPU coatings. Note de contenu : - EXPERIMENTAL MATERIALS AND METHODS : Materials and preparation of GO/WPU nanocoatings - Characterization of GO/WPU nanocoating properties
- RESULTS AND DISCUSSION : Characterization of GO/WPU nanocoating dispersion quality - Mechanical properties - Oxygen permeability - Water sorption of GO/WPU nanocoatings at different relative humidity levels - Flammability - Thermal conductivityDOI : 10.1007/s11998-019-00267-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00267-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33743
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 1 (01/2020) . - p. 255-269[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21517 - Périodique Bibliothèque principale Documentaires Disponible High performance leather based on in situ formation of reduced graphene oxide in chrome tanning / Xinle Yang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 5 (05/2022)
[article]
Titre : High performance leather based on in situ formation of reduced graphene oxide in chrome tanning Type de document : texte imprimé Auteurs : Xinle Yang, Auteur ; Yanchun Li, Auteur ; Mao Yang, Auteur ; Xugang Dang, Auteur ; Shan Cao, Auteur Année de publication : 2022 Article en page(s) : p. 206-211 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Cuirs et peaux
Cuirs et peaux -- Propriétés mécaniques
Matériaux hautes performances
Oxyde de graphène
Tannage au chrome
Température de retrait
ThermocinétiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A novel method of high performance leather prepared via in situ reduction of graphene oxide after tanning was proposed in this research. First, nano-graphene oxide (GO) was prepared by an improved Hummers method. Then, the prepared GO was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Finally, GO was added during the chrome tanning process, and GO was reduced by ascorbic acid after the chrome tanning was completed. Moreover, the shrinkage temperature, tensile strength, tear strength and thermal conductivity of the finished leather were investigated. The results showed that the absorption of chrome tanning agent was significantly improved by the addition of GO. The tensile strength, tear strength, and the thermal conductivity of the resulted leather obviously surpassed the leather tanned by chrome tanning agent. Specifically, the tensile strength and tear strength of the leather reached 21.25 MPa and 163.95 N·mm-1 , respectively, when the amount of reducing agent was ten times the amount of GO. A combination of the tanning of leather and the in situ reduction of GO is expected to become a new processing method for preparation of high performance. Note de contenu : - EXPERIMENTAL : Materials and chemicals - Preparatio of GO - Tanning process - Reduction of GO - Characterization - Physicochemical properties of leather
- RESULTS AND DISCUSSION : Infrared analysis of GO - XRD analysis of GO - Morphology analysis - XPS analysis of GO - Physical - mechanical properties testing of leather - Thermal conductivity testing of leather
- Table 1 : Experimental scheme for in-situ reduction of GO
- Table 2 : Chemical composition of grpahite and GO
- Table 3 : Physical - mechanical properties of leatherDOI : https://doi.org/10.34314/jalca.v117i5.4917 En ligne : https://drive.google.com/file/d/19dT_nj0m_Vl53ZtahY9OQbpl-TY3vzkU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37571
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 5 (05/2022) . - p. 206-211[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23398 - Périodique Bibliothèque principale Documentaires Disponible Highly dispersed graphene oxide–zinc oxide nanohybrids in epoxy coating with improved water barrier properties and corrosion resistance / Nurul Husna Othman in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)
[article]
Titre : Highly dispersed graphene oxide–zinc oxide nanohybrids in epoxy coating with improved water barrier properties and corrosion resistance Type de document : texte imprimé Auteurs : Nurul Husna Othman, Auteur ; Wan Zaireen Nisa Yahya, Auteur ; Mokhtar Che Ismail, Auteur ; Mustapha Zi, Auteur ; Zi Kang Koi, Auteur Année de publication : 2020 Article en page(s) : p. 101-114 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Anticorrosifs
Anticorrosion
Epoxydes
Nanoparticules
Oxyde de graphène
Oxyde de zinc
Revêtements organiques
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : Epoxy resin (EP) coating that prevents corrosion is subject to premature failure as its crosslinking network appears to be porous due to the presence of hollow spaces across the network, which leads to poor water barrier. This study introduces a novel approach of utilizing the stable surface property of zinc oxide (ZnO) to facilitate the dispersion of graphene oxide (GO) sheets in epoxy coating to improve water barrier and corrosion resistance properties. The ZnO nanoparticles (ZnO NPs) were decorated on GO sheets by using (3-aminopropyl)triethoxysilane as coupling agent. The GO-ZnO nanohybrids were successfully formed, as demonstrated in Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses. The GO-ZnO sheets were well dispersed in epoxy matrix with no significant agglomeration, as verified via field emission scanning electron microscopy with energy-dispersive X-ray spectroscopy. The decoration of GO with ZnO NPs expanded the spacing between GO sheets, as observed from the outcomes of X-ray diffraction analysis, which improved exfoliation and compatibility in epoxy matrix. Based on the investigations and characterization outputs, the well-dispersed GO-ZnO nanohybrids in the epoxy coatings had effectively improved water barrier properties, as well as adhesion and corrosion protection, in comparison with neat epoxy (EP) and GO–epoxy coatings.AAT Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of graphene oxide-zinc oxide (Go-ZnO) nanocomposite - Preparation of epoxy nanocomposite coating - Corrosion tests - Pull-off adhesion
- RESULTS AND DISCUSSION : Characterization of functionalized zinc oxide (APTES-ZnO) and GO-ZnO - Dispersion behavior of GO and GO-ZnO nanohybrids in solvent - Characterization of GO/EP and Go-ZnO/EP nanocomposites - Corrosion protection performance of EP? GO/EP, and GO-ZnO/EP coatingsDOI : 10.1007/s11998-019-00245-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00245-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33731
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 1 (01/2020) . - p. 101-114[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21517 - Périodique Bibliothèque principale Documentaires Disponible 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 epoxy-SiO2/GO nanosheets anti-corrosive coating for aeronautic aluminum Al6061-T5 / Jevet E. D. López-Campos in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 2 (03/2024)
[article]
Titre : Hybrid epoxy-SiO2/GO nanosheets anti-corrosive coating for aeronautic aluminum Al6061-T5 Type de document : texte imprimé Auteurs : Jevet E. D. López-Campos, Auteur ; José Mojica-Gómez, Auteur ; Alfredo Maciel-Cerda, Auteur ; VÃctor M. Castano, Auteur ; Genoveva Hernandez-Padron, Auteur Année de publication : 2024 Article en page(s) : p. 559-574 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite.
L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement.
L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium.
Anticorrosifs
Anticorrosion
Avions -- Revêtements
Caractérisation
Couches minces
Dioxyde de silicium
Epoxydes
Essais accélérés (technologie)
Essais dynamiques
Métaux -- Revêtements protecteurs
Mouillabilité
Oxyde de graphène
Revêtements organiques
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : The mechanical and anti-corrosive evaluation of a hybrid epoxy resin–SiO2 and graphene oxide (GO) are presented. Three composite materials were prepared with 0%, 0.1 wt% and 0.5 wt% GO concentrations. The hybrid material was prepared by the sol-gel process incorporating the silica particles in situ within the epoxy resin (ER) matrix and previously that ER was functionalized with carboxyl groups using abietic acid and labeled as functionalized epoxy resin. The deposition of the three hybrids in aluminum 6061 substrates was made by blade coating, measuring wet and dry film thickness. The study of mechanical properties involved adhesion, pencil scratch hardness, and abrasion test methods where the incorporation of 0.5 wt% of GO improved the mechanical properties considerably. The anti-corrosive properties of the coatings were evaluated through electrochemical impedance spectroscopy and accelerated corrosion using a salt spray chamber showing that GO forms an anti-corrosive barrier increasing the operation life of the coatings in corrosive environments. Anti-ice properties were related to the contact angle measurement from which the GO concentrations showed more hydrophobic behavior. All the tests were carried out according to ASTM standards. The incorporation of 0.5% of GO showed a significant improvement in the mechanical and anti-corrosive results, improving corrosion resistance up to 500 h. The abrasion tests had an increase in 35%, its hardness up to 9H, and the wear index improved by 29.14% compared with composites with 0.1 wt% of GO and without GO. The HREF1 and HREF5 materials do present an increase in the contact angle thanks to the incorporation of graphene oxide. The results of electrochemical impedance spectroscopy and the impedance curves show a better behavior for the HREF5 composite due to the difference in resistance over time. Note de contenu : - MATERIALS
- METHODOLOGY : Synthesis - Preparation of aluminum substrates - Preparation of hybrid coatings
- CHARACTERIZATION : Mechanical tests - Corrosion test
- RESULTS AND DISCUSSION : GO nanosheets characterization - Spectroscopic coatings characterization - SEM characterization - Mechanical characterization - Accelerated corrosion - Electrochemical impedance spectroscopy (EIS) - Corrosion mechanism - Wettability
- Table 1 : Adhesion, hardness, and abrasion results for specific thickness (*2 mm grid cut for thickness greater than 50 um)
- Table 2 : Wear index calculations (ASTM D4060-19)
- Table 3 : EIS equivalent circuit model results for each element for the hybrid coatingsEn ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00838-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40777
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 2 (03/2024) . - p. 559-574[article]Improved corrosion protection performance of electrophoretic epoxy coatings with the incorporation of amino-functionalized graphene oxide / Rui Gou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 2 (03/2024)
PermalinkImproving anticorrosion performance of epoxy coating by hybrids of rGO and g-C3N4 nanosheets / Zhuang Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)
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PermalinkInfluence of modified graphene oxide on the antifouling performance of waterborne polyurethane coatings containing amphiphilic honeycomb surface / Xu Zhao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)
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PermalinkPolyaniline-modified graphene oxide nanocomposites in epoxy coatings for enhancing the anticorrosion and antifouling properties / Sara Fazli-Shokouhi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 4 (07/2019)
PermalinkPolydopamine functional reduced graphene oxide for enhanced mechanical and electrical properties of waterborne polyurethane nanocomposites / Shengwen Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)
PermalinkPreparation and characteristics of graphene-based polymeric leather fatliquor / Zhenyu Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 9 (09/2020)
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