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Spray-assisted layer-by-layer assembly of decorated PEI/PAA films: morphological, growth and mechanical behavior / Eduardo Ortega in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 4 (07/2017)
[article]
Titre : Spray-assisted layer-by-layer assembly of decorated PEI/PAA films: morphological, growth and mechanical behavior Type de document : texte imprimé Auteurs : Eduardo Ortega, Auteur ; Genaro Zavala, Auteur ; M. A. Gracia-Pinilla, Auteur ; E. de Casas, Auteur ; V. Guzman, Auteur ; J.-Luis Menchaca, Auteur Année de publication : 2017 Article en page(s) : p. 927-935 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acide polyacrylique
Couches minces multicouches
Polyélectrolytes
Polyéthylènimines
Revêtement autoréparant:Peinture autoréparanteIndex. décimale : 667.9 Revêtements et enduits Résumé : The development and study of new smart materials is an emergent research area with high potential applications. In this study, we have fabricated poly(ethyleneimine)/poly(acrylic acid) multilayer films on glass substrates by automated spray-layer-by-layer (spray-LbL) technique. By analyzing the changes in thickness, roughness and elasticity, with fine-tuning of the operational parameters of the spray-LbL system, evident trends of its effect on the multilayer construction were observed. In the case of its mechanical properties, the stability of Young’s modulus (up to 8.25 GPa) from film thickness at this scale was detected, making it variable for other factors such as pH and molecular weight. This work also identified the healability phenomenon that is present in the exponentially grown PEI/PAA samples, based on the reduction in viscosity of the polymer complexes and the interdiffusion of polyelectrolytes at the damaged zones in the presence of water. These properties allow for the assembly of a highly electrically conductive multilayered film by dispersion of a top layer of silver nanowires whose sheet resistance is increased around 5% after multiple damaging events. These experimental results provide new data for the evaluation and design of polyelectrolyte multilayers assembled with a spin-assisted automated spray deposition system to serve as substrates for mechanoelectrical devices which can benefit from its self-healing and modulated mechanical capabilities. Note de contenu : - EXPERIMENTAL : Materials - Multilayer film preparation - Topographic, mechanic and morphological characterization - Healability of weak-weak polyelectrolyte samples - Electric behavior of the film's top layer
- RESULTS AND DISCUSSION : Optimal parameters for the automated spray-assisted Lbl assembly - Force measurements - Healability of sprayed polyelectrolyte multilayers - Electrical behavior of the AgNW/PEM filmDOI : 10.1007/s11998-016-9896-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9896-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28934
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Code-barres Cote Support Localisation Section Disponibilité 19194 - Périodique Bibliothèque principale Documentaires Disponible Stimuli-responsive polyurethane-urea polymer for protective coatings and dampening material / Anastassija Wittmer in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 1 (01/2019)
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Titre : Stimuli-responsive polyurethane-urea polymer for protective coatings and dampening material Type de document : texte imprimé Auteurs : Anastassija Wittmer, Auteur ; Andreas Brinkmann, Auteur ; Volkmar Stenzel, Auteur ; Katharina Koschek, Auteur Année de publication : 2019 Article en page(s) : p. 189-197 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amortissement (mécanique)
Analyse mécanique dynamique
Anticorrosifs
Anticorrosion
Copolymère uréthane-urée
Matériaux sensibles aux stimulis
Mesure
Revêtement autoréparant
Revêtements -- AnalyseIndex. décimale : 667.9 Revêtements et enduits Résumé : Intrinsic self-healing coatings have been drawing more and more attention over recent years. A self-healing coating that is able to maintain its original appearance and performance after damage is attractive for a huge scope of applications. This article reports the synthesis of a polyurethane-urea coating with 1-(2-aminoethyl)-imidazolidin-2-one (UDETA) units showing temperature- and moisture-triggered self-healing. Calorimetric and spectroscopic analyses give insight into the self-healing mechanism showing that the absorbed water is able to disturb inter- and intramolecular hydrogen bonds of the polymer chains and decrease the glass transition temperature of the polymer. Temperature-mediated self-healing can be performed from 80 up to 200°C. Aside from self-healing, the molecular dynamics in the polyurethane-urea polymer prove to be beneficial for damping applications as confirmed by dynamic mechanical analysis. Thus, the polymer system features properties that are useful for two different applications, namely in coatings with self-healing and corrosion protective properties and in dampening materials. Note de contenu : - EXPERIMENTAL : Materials - Polymer preparation - Measurements
- RESULTS AND DISCUSSION : Evaluation of self-healing - Application casesDOI : 10.1007/s11998-018-0114-z En ligne : https://link.springer.com/article/10.1007/s11998-018-0114-z Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31984
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Code-barres Cote Support Localisation Section Disponibilité 20659 - Périodique Bibliothèque principale Documentaires Disponible Superhydrophobic surfaces for corrosion protection : a review of recent progresses and future directions / Dawei Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 1 (01/2016)
[article]
Titre : Superhydrophobic surfaces for corrosion protection : a review of recent progresses and future directions : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9744-6.pdf Type de document : texte imprimé Auteurs : Dawei Zhang, Auteur ; Luntao Wang, Auteur ; Hongchang Qian, Auteur ; Xiaogang Li, Auteur Année de publication : 2016 Article en page(s) : p. 11-29 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion
Hydrophobie
Microstructures
Mouillage (chimie des surfaces)
Revêtement autoréparant:Peinture autoréparanteIndex. décimale : 667.9 Revêtements et enduits Résumé : Due to their superior water-repelling effects, superhydrophobic surfaces have received increasing attention as a promising solution to corrosion of metallic materials. The present article introduces the fundamental theories behind superhydrophobicity followed by a comprehensive review of the recent progresses of this rapidly growing field over the past 5 years. A critical discussion over anticorrosion mechanisms of superhydrophobic surfaces is also provided. For many realistic applications, future efforts are pressingly demanded to prolong the corrosion resistance of these superhydrophobic surfaces. To this end, several important strategies and examples in designing stable, self-healable, or inhibitor-loaded superhydrophobic surfaces are discussed. Note de contenu : - THE THEORY OF SUPERHYDROPHOBIC SURFACES : Wettability of a smooth surface - Wettability of a rough surface
- APPLICATION OF SUPERHYDROPHOBIC SURFACES FOR CORROSION PROTECTION : Etching - Wet chemical reaction - Hydrothermal method - Anodization - Electrodeposition - Sol-gel method - Nanocomposite coatings - Templating - Mechanistic aspects
- FUTURE TRENDS IN DEVELOPMENT OF SUPERHYDROPHOBIC SURFACES WITH LONG-LASTING CORROSION RESISTANCE : Improving the stability of superhydrophobic surfaces - Self-healing capability of superhydrophobic surfaces - Inhibitor-containing superhydrophobic coatingsDOI : 10.1007/s11998-015-9744-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9744-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25368
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Code-barres Cote Support Localisation Section Disponibilité 17819 - Périodique Bibliothèque principale Documentaires Disponible Sustainable microcapsules for self-healing and corrosion protection in powder coatings / Vimal Saimi in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 210, N° 4661 (05/2020)
[article]
Titre : Sustainable microcapsules for self-healing and corrosion protection in powder coatings Type de document : texte imprimé Auteurs : Vimal Saimi, Auteur Année de publication : 2020 Article en page(s) : p. 44-47 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Anticorrosifs
Anticorrosion
Caractérisation
Copolymère mélamine-Formaldéhyde
Eau salée
Encapsulation
Huile de linL'huile de lin ou "huile de graines de lin" est une huile de couleur jaune d'or, tirée des graines mûres du lin cultivé, pressées à froid et/ou à chaud ; parfois elle est extraite par un solvant, en vue de l'usage industriel ou artistique, principalement comme siccatif, ou huile auto-siccative.
Les utilisations de l'huile de lin dérivent de sa richesse en acides gras polyinsaturés, en particulier en acides linolénique et linoléique, qui lui doivent leur nom.
L'huile de lin polymérise spontanément à l'air, avec une réaction exothermique : un chiffon imbibé d'huile peut ainsi, dans certaines conditions, s'enflammer spontanément.
Pour ses propriétés de polymère, l'huile de lin est employée seule, ou mélangée à d'autres huiles, résines et solvants, et est utilisée en tant que : Imprégnateur et protecteur des bois à l'intérieur comme à l'extérieur : protection contre l'humidité, les champignons et insectes, et contre la poussière par son caractère antistatique, composant de certains vernis de finition, liant de broyage pour la peinture à l'huile, agent plastifiant du mastic de vitrier, agent durcisseur de diverses préparations, agent de cohérence et liant dans la fabrication du linoléum.
Métaux -- Revêtements protecteurs
Microcapsules
Pulvérisation électrostatique
Revêtement autoréparant
Revêtements poudre
Stabilité thermique
Test d'immersion
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 this work, a self-healing powder coating based on micro-encapsulated linseed oil is reported. Linseed oil was chosen as the self-healing agent for its excellent film forming capability and Poly (melamine formaldehyde) (PMF) was chosen as a shell material. Microcapsules were synthesised by in-situ polymerisation. A powder coating based on thermoplastic powder was used. Microcapsules were mixed with the powder coating and sprayed electrostatically on the cold rolled steel. The thermal stability of microcapsules was evaluated with TGA. The corrosion evaluation of the coating was done with the electrochemical impedance spectroscopy (FIS) and salt water immersion tests. The experimental results have demonstrated a strong inhibition of corrosion in the micro-encapsulated system. Furthermore, impedance measurements has shown an increase of impedance modulus of the micro-encapsulated system during immersion in the corrosive medium, which is reiated to the suppression of active corrosion activities and healing of the scratched areas. Healing of the coating was also demonstrated by optical microscopy. This study successfully demonstrated the self-healing activity of micro-encapsulated linseed oil in protecting steel surfaces against corrosion in powder coatings. Note de contenu : - EXPERIMENT : Materials - Synthesis of microcapsules - Characterisation of microcapsules - Preparation of samples - Characterisation of coated samples Electrochemical Impedance Spectroscopy (EIS) - Salt water immersion tests
- RESULTS AND DISCUSSIONS : Thermal stability of microcapsules - SEM morphology of microcapsules - electrochemical impedance spectroscopy
- Fig. 1 : Synthesis process of the microcapsules prepared by the in-situ polymerisation method
- Fig. 2 : FTIR spectra of linseed oit (L0), MF shetland microcapsules
- Fig. 3 : TGA curve of LO, microcapsules, MF sheti
- Fig. 4 : TGA isothermal curves of microcapsutes ptotted versus the temperature profile (25 to 200°C at 10°C min-'), held at 160°C for 10min
- Fig. 5 : SEM morphology of microcapsutes (a) after synthesis (b) held at 160°C for 10min (c) shell thickness
- Fig. 6 : (a) Distribution of microcapsules in the powder coating (b) close up of microcapsules (C) microcapsutes heated
- Fig. 7 : Bode magnitude plots of the immersed powder coating semples in 3.5% NaCl solution aqueous solution at different exposure times
- Fig. 8 : Salt immersion test after 168hr of exposure (ai blank (b] coating with microcapsulesEn ligne : https://drive.google.com/file/d/1Z4y4aYX3v60E6AgFENVOlmDYor8O13pv/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34251
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Code-barres Cote Support Localisation Section Disponibilité 21744 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and property of room-temperature self-healable cathodic electrophoretic deposition coatings based on cationic waterborne polyurethane / Yingyu Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)
[article]
Titre : Synthesis and property of room-temperature self-healable cathodic electrophoretic deposition coatings based on cationic waterborne polyurethane Type de document : texte imprimé Auteurs : Yingyu Li, Auteur ; Jingwei He, Auteur ; Hongfeng Luo, Auteur ; Xiaoling He, Auteur ; Fang Liu, Auteur Année de publication : 2022 Article en page(s) : p. 1621-1633 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dépôt électrophorétique
Polymères -- Synthèse
Polymères en émulsion
Polyuréthanes
Revêtement autoréparant
Revêtements -- Propriétés thermiques
Revêtements en phase aqueuse
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Cathodic electrophoretic deposition (CED) coatings are inevitably scratched following their application in processes such as automotive finishing. Self-healing coatings possess the ability to repair micro-scale damage, thereby extending their service life and reducing maintenance costs. Here, a novel strategy was developed to synthesize room-temperature intrinsic self-healing CED coatings by inserting 2-aminophenyl disulfide (APDS) into the polymer chain of cationic waterborne polyurethane (CWPU). Emulsion films incorporating the disulfide (SCWPU) could self-heal at room temperature via dynamic disulfide bond exchange and hydrogen bonding interactions, and their structures were confirmed by FTIR and Raman spectroscopy. The thermal properties of the SCWPU films were determined by differential scanning calorimetry and thermal gravimetric analysis. The effects of APDS incorporation and hard segment content (HSC) on the self-healing ability, mechanical and emulsion properties of the SCWPU films were systematically investigated. The results showed that the self-healing abilities of SCWPU film were 97.2% at RT over 24 h and 96.5% at 37°C (body temperature) after 4 h. CED coatings (8 μm, 3H pencil hardness) prepared from SCWPU emulsion also displayed self-healing properties at room temperature. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of cationic waterborne polyurethanes with disulfide bond (SCWPU) - Preparation of SCWPU films - Characterization of SCWPU - Self-healing performance - Preparation of films of cathodic electrodeposition (CED) coatings
- RESULTS AND DISCUSSION : FTIR and Raman spectra analysis - Thermal properties - Self-healing properties - Properties of the waterborne CED coatings
- Table 1 : Composition of Sxa-CWPU samples (mol ratio)
- Table 2 : Composition of SCWPU/HSCa samples (mol ratio)
- Table 3 : Properties of the CED film coatings and SCWPU emulsionsDOI : https://doi.org/10.1007/s11998-022-00634-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00634-w.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38294
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Code-barres Cote Support Localisation Section Disponibilité 23672 - Périodique Bibliothèque principale Documentaires Disponible The polyaniline-modified TiO2 composites in water-based epoxy coating for corrosion protection of Q235 steel / Xuehui Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 1 (01/2019)
PermalinkUV-curable alkyd coating with self-healing ability / Saman Nornadila Mohd in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)
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