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Tactile friction and perception of UV-curable coatings and their relation to physical surface parameters and contact mechanic simulation / Thomas Ules in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1803-1814 Titre : Tactile friction and perception of UV-curable coatings and their relation to physical surface parameters and contact mechanic simulation Type de document : texte imprimé Auteurs : Thomas Ules, Auteur ; Michael GrieBer, Auteur ; Andreas Hausberger, Auteur ; Christian Schipfer, Auteur ; Mohammad Mansouri, Auteur ; Peter Fuchs, Auteur ; Sandra Schlögl, Auteur ; Dieter P. Gruber, Auteur Année de publication : 2023 Article en page(s) : p. 1803-1814 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Chimie des surfaces Dureté (matériaux) Eléments finis, Méthode des Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Simulation, Méthode de Toucher Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, the results of new investigations on the relationship between physical surface parameters of polymer-based coatings, skin hydration levels and tactile friction are presented. For this purpose, the chemical composition of the investigated coatings was varied on the basis of the curing and binding agent and also with respect to the addition of selected fillers. This allowed the adjustment of various surface parameters such as hardness, surface wettability and roughness over a wide range. Tribological tests were carried out in which the coefficient of friction between the finger pad and the respective coating was measured for different skin hydration levels. A specially developed setup was used that minimized changing skin hydration levels during the experiments that would impede reproducible friction measurements. While for dry skin the perceived friction correlates well to the coefficient of friction and surface hardness, this is not the case for moist finger skin. The results are explained under the assumption of adhesion dominated friction and the application of the Hertz contact theory. This finding was further investigated through contact mechanic simulations using the finite element method (FEM). To this end, the contact area formation dependence on the reaction force was studied for surfaces of different hardness and skin with different mechanical properties reflecting various hydration levels. The results qualitatively confirmed the experimental findings and the analysis based on the Hertz contact theory. Note de contenu : - EXPERIMENTAL : Materials - Methods - FEM contact model - RESULTS & DISCUSSION : Physical characterization - Tactile friction - Perception studies - Contact simulation - Table 1 : Chemical composition of the UV-curable coatings (all formulations contained 2 wt% Irgacure TPO-L) - Table 2 : Physical surface parameters of the investigated sample coatings - Table 3 : Elastic moduli (in kPa) of the hyperelastic material model (neo-Hookean solid) for the single skin layers Stratum Corneum (SC), Epidermis (ED) and Dermis (D) DOI : https://doi.org/10.1007/s11998-023-00792-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00792-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40162 [article]

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Impact of various Mg(OH)2 morphologies on hydrophobicity, mechanical, and physical properties of polyurethane nanocomposite / Zahra Rajabimashhadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1815-1834 Titre : Impact of various Mg(OH)2 morphologies on hydrophobicity, mechanical, and physical properties of polyurethane nanocomposite Type de document : texte imprimé Auteurs : Zahra Rajabimashhadi, Auteur ; Rahim Naghizadeh, Auteur ; Ashkan Zolriasatein, Auteur ; Sonia Bagheri, Auteur ; Claudio Mele, Auteur ; Carola Espositio Corcione, Auteur Année de publication : 2023 Article en page(s) : p. 1815-1834 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dureté (matériaux) Hydrophobie Hydroxyde de magnésium L'hydroxyde de magnésium est un composé inorganique de formule Mg(OH)2. Ce sel se présente sous la forme d'une poudre pratiquement insoluble dans l'eau. Le « lait de magnésie » est une solution saturée d'hydroxyde de magnésium, d'aspect laiteux. Sa forme minérale naturelle est connue sous le nom de brucite. L'hydroxyde de magnésium est utilisé en thérapeutique comme antiacide (pour calmer les brûlures d'estomac) et comme laxatif. Matériaux hybrides Polyuréthanes Revêtements organiques Revêtements poudre Index. décimale : 667.9 Revêtements et enduits Résumé : Polyurethane (PU) is one of the best polymer coatings due to its wide range of advantages such as easy fabrication, lightness, non-toxicity, durability, adhesion, flexibility, and strength. However, some of its drawbacks make it a suitable choice for the manufacturing of nanocomposites to enhance its properties. Hydrophobicity and flame retardancy are two of the most crucial characteristics of a polymer nanocoating. Magnesium hydroxide (MH), with its ability to be produced in a multitude of morphologies and exceptional properties, especially in flame retardancy, has always attracted the interest of researchers. One of the best methods for synthesizing high-purity, controlled-size, and controlled-shape nanoparticles is the hydrothermal technique. In this paper, magnesium chloride and sodium hydroxide were utilized as raw materials to synthesize four different morphologies of MH, such as plate, flake, spherical, and disk, functionalized using 3-Aminopropyl triethoxysilane (APTES). In the following, PU nanocomposites were fabricated by drop casting method including 3 % w.t. of different synthesized MH. The influence of each morphology on different properties of PU/Mg(OH) was then investigated using different analyses such as spectroscopy, mechanical, and hydrophobicity tests. The observations indicated that different surface topography would result from the presence of nanoparticles with various morphologies on the nanocomposite’s surface. Extremely high water contact angles were attained as a result of the surface roughness, revealing the super hydrophobic behavior of the produced nanocoatings. Also, the presence of MH in PU matrix improved the mechanical properties of the nanocomposite, depending on the aspect ratio and particle size.: Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Nano-MH synthesis - PU/Mg(OH)2 fabrication - Characterization - RESULTS AND DISCUSSION : Nano-MH powder characterization - PU/Mg(OH)2 nanocomposite - Table 1 : Materials used for MH synthesis - Table 2 : Materials used for PU/Mg(OH)2 fabrication - Table 3 : The chemical information of the PU/Mg(OH)2 nanocomposites - Table 4 : Synthesiszed MH powder properties DOI : https://doi.org/10.1007/s11998-023-00797-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00797-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40163 [article]

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Phase separation in Michael addition curable coatings to enhance flexibility and adhesion robustness / Bart A. J. Noordover in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1835-1844 Titre : Phase separation in Michael addition curable coatings to enhance flexibility and adhesion robustness Type de document : texte imprimé Auteurs : Bart A. J. Noordover, Auteur ; Yujing Zhang, Auteur ; Richard Brinkhuis, Auteur ; Martin Bosma, Auteur ; Florian Lunzer, Auteur ; Patrice Roose, Auteur ; Luc Lindekens, Auteur Année de publication : 2023 Article en page(s) : p. 1835-1844 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Analyse thermomécanique dynamique Caractérisation Formulation (Génie chimique) Michael, Addition de L'addition de Michael ou réaction de Michael est une réaction qui permet la création de liaisons carbone-carbone, voire de liaisons carbone-soufre. Il s'agit de l'addition nucléophile d'un carbanion sur un composé carbonylé α,β insaturé (aldéhyde, cétone et même ester α,β insaturé, des nitriles et des amides α,β insaturés pouvant aussi être utilisés). Elle appartient à la famille des additions nucléophiles conjuguées. Cette réaction doit son nom au chimiste américain Arthur Michael. Polyester maloné Réticulation (polymérisation) Revêtements organiques Séparation de phases Souplesse (mécanique) Vernis -- Propriétés mécaniques Index. décimale : 667.7 Cires, laques, vernis Résumé : Polyether-based acryloyl-functional acceptor binders were combined with malonated polyester donor resins in base-catalyzed carbon-Michael addition curable paint systems. The high equivalent weight, flexible polyether-based acceptors afford a multi-phase morphology in the final coating film, which is formed through polymerization-induced incompatibility and phase separation. Additional thermal transitions were observed in dynamic mechanical thermal analysis experiments, indicating the presence of low Tg domains in the highly crosslinked continuous phase. As a consequence, these novel network compositions show strongly improved ductility and adhesion robustness over a range of substrate types. Non-reactive polyether-based binders, lacking covalent bonding to the crosslinked continuous phase, only lead to limited, less robust property improvement. It was demonstrated that acceptor binders based on poly(propylene glycol) segments are highly effective in enhancing flexibility while maintaining a high coating hardness. Both clearcoat and pigmented topcoat formulations were developed showing similar performance improvements, opening the door to benefits in a variety of application fields. Note de contenu : - Experimental section : Materials - Preparation of malonated polyester MPE1 - RMA coating formulation and application - Characterization methods - Results and discussion : Polymerization-induced phase separation using acryloyl-functional polyethers - Mechanical and adhesion properties of multi-phase RMA curable compositions - RMA reactive vs non-reactive polyether segments - Reactive polyether-containing pigmented RMA curable compositions - Table 1 : Michael addition curable clearcoat formulation containing PPG2k UA - Table 2 : Polyether-based UAs studied in RMA coatings - Table 3 : Testing results of multi-phase RMA curable compositions - Table 4 : Testing results of multi-phase RMA curable compositions - Table 5 : Adhesion testing results on different types of substrates for pigmented Michael addition curable compositions based on MPE and DiTMPTA + acceptor resin 2 (% on total resin solids), using a carbonate-blocked strong base as catalyst DOI : https://doi.org/10.1007/s11998-023-00804-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00804-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40164 [article]

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Facile preparation of particle-free hybrid amine silver ink with synergistic effect for low-resistivity flexible films / Liying Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1845-1856 Titre : Facile preparation of particle-free hybrid amine silver ink with synergistic effect for low-resistivity flexible films Type de document : texte imprimé Auteurs : Liying Zhang, Auteur ; Guoyou Gan, Auteur ; Peiyuan Fan, Auteur ; Yunchuan Liu, Auteur ; Tianwei Wang, Auteur ; Weichao Li, Auteur ; Jinghong Du, Auteur Année de publication : 2023 Article en page(s) : p. 1845-1856 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amines Une amine est un composé organique dérivé de l'ammoniac dont certains hydrogènes ont été remplacés par un groupement carboné. Si l'un des carbones liés à l'atome d'azote fait partie d'un groupement carbonyle, la molécule appartient à la famille des amides. Découvertes en 1849, par Wurtz les amines furent initialement appelées alcaloïdes artificiels. On parle d'amine primaire, secondaire ou tertiaire selon que l'on a un, deux ou trois hydrogènes substitués. Par exemple, la triméthylamine est une amine tertiaire, de formule N(CH3)3. Typiquement, les amines sont obtenues par alkylation d'amines de rang inférieur. En alkylant l'ammoniac, on obtient des amines primaires, qui peuvent être alkylées en amines secondaires puis amines tertiaires. L'alkylation de ces dernières permet d'obtenir des sels d'ammonium quaternaire. D'autre méthodes existent : 1. Les amines primaires peuvent être obtenues par réduction d'un groupement azoture, 2. Les amines peuvent aussi être obtenues par la réduction d'un amide, à l'aide d'un hydrure, 3. L'amination réductrice permet l'obtention d'amines substituées à partir de composés carbonylés (aldéhydes ou cétones), 4. Les amines primaires peuvent être obtenues par la réaction de Gabriel. Argent Caractérisation Conduction électrique Encre électronique Ligands Revêtement par centrifugation Souplesse (mécanique) Synergie Index. décimale : 667.4 Encres Résumé : Amine ligand, as one of the essential components of the Ag–amine complex, is necessary to reduce the sintering temperature and time of conductive inks. Herein, we report the facile preparation of hybrid amine conductive silver ink, mainly composed of silver oxalate–hybrid amine complex and methanol–acetone solvent. The synergistic effect of long-chain and short-chain amines enhances the uniformity of silver nanoparticles in the silver film. A uniformly conductive silver film is obtained by spin-coating as-prepared ink on the polyimide film, followed by thermal sintering. Then, the influence of butylamine content and sintering parameters on the physical properties and microstructure of silver film is systematically investigated. The resistivity of silver films, sintered at 170 °C for only 20 min, is found to be 6.71 μΩ·cm, which is four times higher than bulk silver. In addition, silver films after bending and adhesion test exhibit low resistivity and excellent adhesion. These results indicate that the hybrid amine conductive silver ink can provide promising opportunities for fabricating highly conductive flexible printed electronics at low temperatures in short times. Note de contenu : - Materials - Preparation of hybrid amine ink - Spin coating and sintering of conductive silver ink - Materials characterization - Table 1 : The composition of hybrid amine ink - Table 2 : Experimental conditions and electrical properties of silver films in literatures DOI : https://doi.org/10.1007/s11998-023-00781-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00781-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40165 [article]

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Sustainable coatings based on core-shell pigments to enhance antibacterial and other beneficial paper properties / M. G. Mohamed in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1857-1866 Titre : Sustainable coatings based on core-shell pigments to enhance antibacterial and other beneficial paper properties Type de document : texte imprimé Auteurs : M. G. Mohamed, Auteur ; N. M. Ahmed, Auteur ; M. Samir, Auteur Année de publication : 2023 Article en page(s) : p. 1857-1866 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Chimie analytique Dioxyde de titane Fragmentation Papier -- Propriétés mécaniques Papier -- Propriétés optiques Papier -- Revêtements Papier et carton couché Pigments Talc Index. décimale : 667.9 Revêtements et enduits Résumé : Paper manufacturers are constantly looking for new methods to improve coated paper properties. Pigments are encountered in paper coatings to add new functions. For example, titanium dioxide (TiO2 ) and talc are considered among the best-known pigments used in paper coating and manufacturing due to their whiteness and other beneficial properties. Nevertheless, talc has a weak dispersion during which its particles agglomerate, and this disadvantage needs to be overcome before its application which means higher cost. Therefore, in this work, a core–shell technique is used to modify the talc surface and enhance its dispersion in order to promote its use in improving the properties of the paper. Core–shell pigments are composed of a thin shell of (nano- and micronized) titanium dioxide precipitated on talc particles. These prepared talc/TiO2 core–shell pigments were characterized using various techniques such as XRF, SEM, and TEM, and then they were incorporated in paper coatings to evaluate their effect on the different properties of the coated papers. The results showed that nano-talc/TiO2 with the obtained unique chemical and morphological structure has improved the physical, mechanical, and optical properties of the coated papers besides improving their antimicrobial activity, especially when compared to papers coated with micronized talc/TiO2. Note de contenu : - EXPERIMENTAL : Materials - Preparation of nano-TiO2/talc core–shell pigments - Preparation of micronized TiO2/talc core–shell pigments - Methods of instrumental analysis - Application of the prepared TiO2/talc core–shell pigments in paper coating - Antibacterial activity test for the prepared pigment - RESULTS AND DISCUSSION : Characterizations of the prepared pigments - Application of the prepared pigments in paper coatings - Mechanical properties - Antibacterial activity measurements - Surface structure of coated paper - Table 1 : XRF of prepared core–shell pigments - Table 2 : Antibacterial activity of the prepared coated paper samples DOI : https://doi.org/10.1007/s11998-023-00782-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00782-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40166 [article]

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Imidization of styrene-maleic anhydride copolymer for dispersing nano-SiO2 in water / Tao Xue in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1867-1880 Titre : Imidization of styrene-maleic anhydride copolymer for dispersing nano-SiO2 in water Type de document : texte imprimé Auteurs : Tao Xue, Auteur ; Caili Yu, Auteur ; Zhongqun Zhou, Auteur ; Faai Zhang, Auteur Année de publication : 2023 Article en page(s) : p. 1867-1880 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents dispersants (chimie) Analyse thermique Caractérisation Copolymère styrène-maléimide Copolymères -- Synthèse Dioxyde de silicium Nanoparticules Poids moléculaires Solutions aqueuses (chimie) Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : Achieving functional styrene-maleic anhydride (SMA) copolymer dispersant is highly attractive but still remains a challenge. Conventional modified SMA dispersants have complex modification steps, poor performance, and limited applications. Thus, a series of styrene–maleimide (SMI) copolymers with different functionality as amphiphilic dispersants for dispersing nano-SiO2 in an aqueous solution were synthesized using a simple preparation process. The changes in the maleic anhydride groups during imidization were tracked using FTIR spectroscopy, 1H-NMR, and GPC. A rotational viscometer and an inverted bottle method were used to measure the viscosity and coagulation time of the nano-SiO2 aqueous dispersion system, respectively, after adding the SMI dispersants. The particle size, size distribution, and dispersant adsorption amount of the dispersion were analyzed using laser particle size analysis ; FTIR spectroscopy and SEM; and TGA, respectively. The results showed that the hydrogen bonds formed between the amino groups in the dispersant and the hydroxyl groups on the SiO2 surface during stirring allowed the dispersant to be adsorbed onto the SiO2 surface after being added to the nano-SiO2 aqueous system. The addition of the SMI dispersant enhanced the steric hindrance and electrostatic repulsion between the nanoparticles, thus making it possible for the SiO2 nanoparticles not to easily aggregate in water, improving their dispersity and stability. Additionally, the type and amount of SMI dispersant used significantly affected the SiO2 nanoparticles' ability to disperse in water. This makes SiO2 particles convenient to use and transport, not produce dust pollution, and easy to store. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of styrene–maleimide dispersants - Preparation of nano-SiO2 aqueous system - Characterization - RESULTS AND DISCUSSION : Synthesis and characterization of the styrene-maleimide (SMI) copolymers - TGA analysis - DSC analysis - Dispersion of the nano-SiO2 aqueous system - Solubility of polymeric dispersant in different solvents - Table 1 : Recipe and properties of SMI dispersant - Table 2 : Molecular weight and PDI of SMA and SMI - Table 3 : Solubility of polymers in different solvents DOI : https://doi.org/10.1007/s11998-023-00783-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00783-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40167 [article]

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Two-dimensional carbon material incorporated and PDMS-coated conductive textile yarns for strain sensing / G. M. Nazmul Islam in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1881-1895 Titre : Two-dimensional carbon material incorporated and PDMS-coated conductive textile yarns for strain sensing Type de document : texte imprimé Auteurs : G. M. Nazmul Islam, Auteur ; Stewart Collie, Auteur ; Maree Gould, Auteur ; M. Azam Ali, Auteur Année de publication : 2023 Article en page(s) : p. 1881-1895 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse morphologique Capteurs de contraintes Caractérisation Conducteurs organiques Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Encapsulation Enduction textile Enrobage (technologie) Matériaux intelligents Oxyde de graphène Polydiméthylsiloxane Le 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. Polydopamine Polyesters Résistance électrique Structures bidimensionnelles Textiles et tissus -- Propriétés mécaniques Textiles et tissus à usages techniques Index. décimale : 667.9 Revêtements et enduits Résumé : In recent years, innovative technology based upon conductive textile yarns has undergone rapid growth. Nanocomposite-based wearable strain sensors hold great promise for a variety of applications, but specifically for human body motion detection. However, improving the sensitivity of these strain sensors while maintaining their durability remains a challenge in this arena. In the present investigation, polydopamine-treated and two-dimensional nanostructured material, e.g., reduced graphene oxide (rGO)-coated conductive cotton and polyester yarns, was encapsulated using polydimethylsiloxane (PDMS) to develop robustly wash durable and mechanically stable conductive textile yarns. Flexibility and extensibility of all textile yarns of every stage were analyzed using texture analysis. The chemical interactions essential for measuring coating performance among all components were confirmed by Fourier transform infrared and scanning electron microscopy. The rGO-coated cotton and polyester yarns exhibited an extensibility of 11.77 and 73.59%, respectively. PDMS-coated conductive cotton and polyester yarns also showed an electrical resistance of 12.22 and 20.33 kΩ, respectively, after 10 washing cycles. The PDMS coating layer acted as a physical barrier against impairment of conductivity during washing. Finally, the mechanically stable and flexible conductive textile yarns were integrated into a knitted cotton glove and armband to create a highly stretchable and flexible textile-based strain sensor for measuring finger and elbow movement. Truly wearable garments able to record proprioceptive maps are critical for further developing this field of application. Note de contenu : - MATERIALS - METHODS : Polyester and cotton yarns extraction - Polydopamine treatment of textile yarns - Preparation of PVA Solution - Fabrication of conductive textile yarns - PDMS coating - Characterization and measurement of electrical resistance of conductive yarns - RESULTS AND DISCUSSION : Fourier transform infrared (FTIR) analysis - Electrical resistance before washing - Wash durability - Mechanical properties - Morphological analysis - Strain sensing performance analysis - Table 1 : FTIR absorption bands of textile yarns - Table 2 : Electric resistance of rGO-coated textile yarns before PDMS coating - Table 3 : Electric resistance of rGO-coated conductive yarns after PDMS coating - Table 4 : Electric resistance of rGO-coated conductive yarns after washing - Table 5 : Mechanical properties of conductive textile yarns DOI : https://doi.org/10.1007/s11998-023-00784-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00784-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40168 [article]

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Fabrication of functional surfaces of aluminum alloy with a transition from superhydrophilic to superhydrophobic by nanosecond laser irradiation / X. G. Song in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1897-1912 Titre : Fabrication of functional surfaces of aluminum alloy with a transition from superhydrophilic to superhydrophobic by nanosecond laser irradiation Type de document : texte imprimé Auteurs : X. G. Song, Auteur ; Z. H. Liang, Auteur ; H. J. Wang, Auteur ; S. P. Hu, Auteur ; W. Fu, Auteur ; X. R. Xu, Auteur ; C. W. Tan, Auteur Année de publication : 2023 Article en page(s) : p. 1897-1912 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Hydrophilie Hydrophobie lasers Métaux -- Surfaces Mouillage (chimie des surfaces) Spectroscopie de photoélectrons Surfaces fonctionnelles Index. décimale : 667.9 Revêtements et enduits Résumé : The wettability of metal surfaces is of importance in different practical applications. In the present work, we investigated the role of alumina coatings in the variation of the surface wettability of aluminum alloys by nanosecond laser ablation. The superhydrophilic surface (water contact angle close to 0°) was successfully prepared, and the superhydrophilic surface was transformed into the superhydrophobic surface (water contact angle of about 151.4°) after non-fluorinated N-octyltriethoxysilane (OcTES) treatment. XPS results showed that the Al–OH (–OH) hydrophilic groups generated by coating decomposition occupied the main regions on the surface after laser ablation. After OcTES treatment, the OcTES molecules formed Si–O–Al bonds with the rough surface, which significantly increased the C–C(H) hydrophobic groups of the surface. The superhydrophobic surface showed good self-cleaning, anti-icing and anti-corrosion properties. The fabrication method is fast, non-toxic and environmentally friendly, which makes it potentially useful for engineering applications. Note de contenu : - MATERIALS AND METHODS : Materials - Surface preparation - Surface characterization - RESULTS AND DISCUSSION : Superhydrophobicity - Performance of superhydrophobic surfaces for potential applications - Table 1 : Laser ablation parameters in the experiments - Table 2 : Liquid parameters used for the surface energy calculation - Table 3 : High-resolution XPS results of the aluminum alloy surfaces after different power laser treatment - Table 4 : High-resolution XPS results of the OcTES-treated aluminum alloy surfaces after different power laser pretreatment - Table 5 : Parameters extracted from cyclic polarization curves DOI : https://doi.org/10.1007/s11998-023-00785-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00785-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40169 [article]

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Effect of graphene coatings on the morphology of submillimeter thin copper wires after salt spray aging / Krzysztof Lis in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1913-1921 Titre : Effect of graphene coatings on the morphology of submillimeter thin copper wires after salt spray aging Type de document : texte imprimé Auteurs : Krzysztof Lis, Auteur ; Krzysztof Placek, Auteur ; Spyros Diplas, Auteur ; Martin F. Sunding, Auteur ; Sandeep M. Gorantla, Auteur ; Grazyna Gryglewicz, Auteur ; Alicja Bachmatiuk, Auteur Année de publication : 2023 Article en page(s) : p. 1913-1921 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Corrosion Cuivre Essais de brouillard salin Graphène Le 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. Métaux -- Revêtements protecteurs Morphologie (matériaux) Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Unprotected copper conductors are prone to oxidation and corrosion, especially when in contact with salt water or at high temperature. In this study, we compared commercially available coating with graphene oxide and plasma-enhanced chemical vapor deposition (PECVD) graphene coated wires in terms of antioxidation and anticorrosion protection. Samples were subjected to aging tests in a salt spray chamber. Thereafter, both the degree of coverage and surface protection were assessed by X-ray photoelectron spectroscopy measurements and scanning electron microscope images, which showed significant surface protection for both graphene coatings. Raman spectra obtained from the transferred coatings revealed their structural stability, which shows that it is possible to successfully use few atomic-layers-thick coatings to protect commercially available wires. Wire resistance tests performed at temperatures up to 320°C showed similar or better results for graphene coatings than for commercially coated wires. Additionally, images of the wires after high temperature tests showed high antioxidation protection for graphene coatings, especially for PECVD. The results of this study can be applied for further research on mechanical suitability of the coatings and wires themselves, especially after high-temperature CVD processes. Such studies may lead to novel Cu wire processing technologies. Note de contenu : - Coverage and corrosion protection - Coating quality assessment - Resistivity measurements - Table 1 : Summary of samples discussed in the study - Table 2 : Results of resistance measurements at room temperature for wires before and after the aging process DOI : https://doi.org/10.1007/s11998-023-00786-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00786-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40170 [article]

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Preparation of high-performance epoxy soybean oil-based UV-curable oligomers and coatings / Yumei Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1923-1933 Titre : Preparation of high-performance epoxy soybean oil-based UV-curable oligomers and coatings Type de document : texte imprimé Auteurs : Yumei Zhou, Auteur ; Linxi Feng, Auteur ; Jinqing Qu, Auteur Année de publication : 2023 Article en page(s) : p. 1923-1933 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse structurale (ingénierie) Copolymère époxy acrylique Copolymères -- Synthèse Huile de soja Oligomères Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Traction (mécanique) Index. décimale : 667.9 Revêtements et enduits Résumé : Ultraviolet (UV)-curable coatings made from acrylated epoxy soybean oil (AESO) combine the advantages of renewable biobased resources and energy-efficient UV-curable materials, so they serve as the primary research objects for developing eco-friendly coatings. However, due to the lack of rigid structure, the hardness and thermal stability of AESO are much lower than those of petroleum-based epoxy acrylate (EA). Therefore, high-performance soybean oil-based UV-curable oligomers were prepared by using dimethylolpropionic acid (DMPA) and methacrylic anhydride (MAAH) to modify ESO and then blended with high-functional active diluent trimethylolpropane triacrylate (TMPTA). Furthermore, FTIR, 1H NMR, and GPC were used to analyze the molecular structure and molecular weight of the oligomers. The oligomers (DMA/MAAESO and DMA/MAAESO-TM) had high esterification rate, curing degree, and good storage stability. The cured coatings from DMA/MAAESO and DMA/MAAESO-TM oligomers had significantly improved thermal stability, tensile, and coating properties. In all samples, DMA/MAAESO-TM cured coating had excellent coating performances. The glass transition temperature (Tg) of DMA/MAAESO-TM was 78.1°C, and its crosslink density (νe) was 6.87 × 10−3 mol/cm3. The hardness, curing time, gloss, flexibility, and impact resistance were H, 20 s, 108.5, 1 mm, and 50 cm, respectively. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of acrylate epoxy soybean oil (AESO) - Synthesis of DMA/MAA - Synthesis of DMA/MAAESO - Preparation of AESO and DMA/MAAESO coatings - Characterization - RESULTS AND DISCUSSION : Synthesis of DMA/MAA and DMA/MAAESO - Structural analysis of AESO and DMA/MAAESO - GPC of AESO and DMA/MAAESO - Physical properties of UV-curable oligomers - Dynamic mechanical analysis of UV-curable coatings - Thermogravimetric analysis of UV-curable coatings - Tensile properties of UV-curable coatings - Coating film properties - Table 1 : Physical properties of oligomers - Table 2 : Dynamic mechanical properties of UV-curable coatings - Table 3 : Thermal properties of UV-curable coatings - Table 4 : Tensile properties of UV-curable coatings - Table 5 : Coating film propertiesTable 6 Comparison of the DMA/MAAESO-TM with other samples in the literature DOI : https://doi.org/10.1007/s11998-023-00787-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00787-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40171 [article]

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Production of a sprayable waterborne polyurethane coating with silver nanoparticles for combating SARS-CoV-2 / Lucas Dall Agnol in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1935-1947 Titre : Production of a sprayable waterborne polyurethane coating with silver nanoparticles for combating SARS-CoV-2 Type de document : texte imprimé Auteurs : Lucas Dall Agnol, Auteur ; Heitor Luiz Ornaghi Jr., Auteur ; Juliano Roberto Ernzen, Auteur ; Fernanda Trindade Gonzalez Dias, Auteur ; Otavio Bianchi, Auteur Année de publication : 2023 Article en page(s) : p. 1935-1947 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Argent Caractérisation Nanoparticules Polymères en émulsion Polyuréthanes Revêtements antiviraux Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : To halt the ongoing global pandemic of SARS-CoV-2, the use of antiviral surfaces becomes an interesting alternative to prevent the spread of pathogens through contaminated surfaces. In this context, waterborne polyurethane coatings with silver nanoparticles (WPU/AgNPs) were synthesized in order to confer antiviral activity to the nanocomposites for further application on surfaces. The chemical structure, physico-mechanical properties, cytotoxic, antibacterial, and antiviral properties of WPU/AgNPs nanocomposites were evaluated. The addition of nanoparticles in WPU did not change the structure of the polymer chain; hence, properties such as hardness, tensile strength, and elongation were not influenced. However, an increase in the surface hydrophobicity followed by a slight yellowing due to the intrinsic color of the nanosilver was observed. Furthermore, the nanocomposites did not show in vitro cytotoxicity for BALB/3T3 cells. The nanocomposites were tested against SARS-CoV-2, obtaining inactivation yields greater than 99.0%, and antibacterial activity against Escherichia coli and Staphylococcus aureus even after three months of use. Hence, these nanocomposites were produced as a sprayable polyurethane for surface coatings application, providing a fantastic finish to all kinds of surfaces such as tables, handrails, switches, and doorknobs. This finish is durable, attractive, and long-lasting. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of WPU/AgNPs nanocomposites - Characterization of WPU/AgNPs nanocomposites - RESULTS AND DISCUSSION : Chemical structure of WPU/AgNPs nanocomposites - Morphology and dispersion of AgNPs in nanocomposite films - Physical–mechanical properties - Surface free energy - UV–Vis spectroscopy and colorimetry - Leaching of the antiviral agent in an aqueous medium - Cell viability - Antiviral efficiency against Sars-CoV-2 - Antibacterial activity - Table 1 : Physical–mechanical properties of neat WPU and WPU/AgNPs nanocomposites - Table 2 : Contact angle (θ, °C) and surface free energy (γs) of WPU and WPU/AgNPs, including the dispersive (γsD) and polar (γsP) contributions - Table 3 : Colorimetric data of the CIE_L*a*b* using the neat WPU as reference (L*84.3; b*2.1, and a*5.9) - Table 4 Nanocomposites antibacterial activity DOI : https://doi.org/10.1007/s11998-023-00788-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00788-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40172 [article]

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Characteristics, antibacterial activity, and antibiofilm performance of a polysiloxane coating filled with organically modified Cu2O / Phi Hung Dao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1949-1961 Titre : Characteristics, antibacterial activity, and antibiofilm performance of a polysiloxane coating filled with organically modified Cu2O Type de document : texte imprimé Auteurs : Phi Hung Dao, Auteur ; Anh Hiep Nguyen, Auteur ; Thanh Thuy Tran, Auteur ; Thuy Chinh Nguyen, Auteur ; Thi Thu Trang Nguyen, Auteur ; Xuan Thai Nguyen, Auteur ; Thi Mai Tran, Auteur ; An Quan Vo, Auteur ; Huu Nghi Do, Auteur ; Minh Quan Pham, Auteur ; Ngoc Nhiem Dao, Auteur ; Ngoc Tan Nguyen, Auteur ; Hoang Nghia Trinh, Auteur ; Hoang Thai, Auteur Année de publication : 2023 Article en page(s) : p. 1949-1961 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Biofilms Eau de mer Inhibition microbienne Nanoparticules Oxyde de cuivre Revêtements -- Propriétés mécaniques Revêtements -- Propriétés physiques Revêtements antisalissures:Peinture antisalissures Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Test d'immersion Index. décimale : 667.9 Revêtements et enduits Résumé : The effects of Cu2O nanoparticles (Cu2O NPs) modified with 3-(trimethoxysilyl)propyl methacrylate (TMSPM) (m-Cu2O NPs) on the properties of a polysiloxane (PS) coating were investigated. The organic surface modifications improved the antimicrobial activity of the Cu2O NPs and their dispersion in a PS matrix. Due to the broad dispersion of the m-Cu2O NPs, the PS/m-Cu2O coating exhibited better mechanical properties and better thermal stability than unmodified Cu2O (u-Cu2O) coatings. The onset temperature of PS/m-Cu2O was 24 °C higher than that of the neat PS coating and 11 °C higher than that of the PS/u-Cu2O coating. The PS/m-Cu2O coating exhibited high antibacterial activity for sulfate-reducing bacterial strains, but the PS/m-Cu2O coating showed slight bacterial inhibition of Pseudomonas stutzeri B27 bacteria (which were isolated under seawater at Phu Quoc Island, Kien Giang Province, Vietnam). Biofilm inhibition by the PS coatings with and without the m-Cu2O NPs was also tested with a natural seawater immersion test. After a 60-day test, the biofilm formed on the PS coating surface was ten times thicker than that on the PS/m-Cu2O coating. Fourier transform infrared spectroscopy (FTIR) data and the surface properties of the coating indicated that immersion in natural seawater insignificantly affected the functional groups of the coating but had a substantial influence on the smoothness of the coating, which made the surface of the coating more hydrophilic. These results suggested that the PS/m-Cu2O could be used as an antifouling coating for the marine industry. Note de contenu : - EXPERIMENTAL : Materials - Surface modification of Cu2O nanoparticles - Preparation of polysiloxane coatings containing m-Cu2O NPs - Preparation of antifouling paint coatings for biofilm resistance by immersion in natural seawater - Immersion of the investigated coatings in natural seawater - Analyses - RESULTS AND DISCUSSION : Effect of organically modified Cu2O NPs on the mechanical properties of the polysiloxane coatings - Thermal behaviors of polysiloxane coatings containing Cu2O NPs - Morphologies of the polysiloxane coatings containing m-Cu2O NPs - Antibacterial activities of polysiloxane coatings containing m-Cu2O NPs - Investigation of biofilm inhibition by the polysiloxane coatings containing m-Cu2O NPs with immersion in natural seawater in the laboratory - Table 1 : Characteristics and qualities of the seawater at the testing site - Table 2 : Physicomechanical properties of the PS/Cu2O NP coatings - Table 3 : Antimicrobial activities of u-Cu2O NPs and m-Cu2O NPs - Table 4 : Antibacterial activities of the PS coatings for Pseudomonas stutzeri B27 bacteria - Table 5 : Antibacterial activities of the PS coatings for sulfate-reducing bacteria DOI : https://doi.org/10.1007/s11998-023-00789-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00789-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40173 [article]

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Synthesis and characterization of organosilicon-modified self-matting waterborne polyurethane with excellent wear resistance / Pengfei Niu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1963-1976 Titre : Synthesis and characterization of organosilicon-modified self-matting waterborne polyurethane with excellent wear resistance Type de document : texte imprimé Auteurs : Pengfei Niu, Auteur ; Weichen Pan, Auteur ; Wei Wang, Auteur ; Meng Wang, Auteur ; Bao Zhang, Auteur ; Junfeng Yang, Auteur ; Xiaohong Peng, Auteur Année de publication : 2023 Article en page(s) : p. 1963-1976 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse morphologique Caractérisation Matériaux auto-mattants Polymères -- Synthèse Polymères en émulsion Polyuréthanes Résistance à l'usure Index. décimale : 667.9 Revêtements et enduits Résumé : Self-matting waterborne polyurethane (WPU) with a rough surface suffers from poor wear resistance, which inevitably hinders its service span. Here, wear-resistant and self-matting WPU resin was prepared via using hydroxypropyl-terminated polydimethylsiloxane (PDMS) in the preparation of prepolymer and N-2-aminoethyl-3-aminopropyltrimethoxysilane (KH-792) as a post-chain extender. The effects of PDMS, 2, 2-Bis(hydroxymethyl)propionic acid (DMPA), and KH-792 on its morphology, particle size, gloss, wear resistance, and hydrophilicity of WPU were also investigated. The gloss of WPU coatings was found to be negatively correlated with the amount of DMPA. Moreover, the matting effect and the wear resistance of WPU were significantly enhanced by the introduction of PDMS and KH-792. When the content of PDMS, DMPA, and KH-792 was 6 wt%, 2.2 wt%, and 40 mol% respectively, the gloss was 3.2 GU, and the wear mass loss was only 6.6 mg, which was 64% lower than that without silicone-modified. This work could provide a new idea for the preparation of wear-resistant and self-matting coatings. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of silicone-modified self-matting WPU - Characterization - RESULTS AND DISCUSSION : FTIR characterization - NMR characterization - Effect of the DMPA content - Effect of the KH-792 content - SEM analysis - 3D morphology characterization DOI : https://doi.org/10.1007/s11998-023-00790-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00790-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40174 [article]

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Anticorrosion healing properties of epoxy coating with poly(urea–formaldehyde) microcapsules encapsulated linseed oil and benzotriazole / Gan Cui in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1977-1996 Titre : Anticorrosion healing properties of epoxy coating with poly(urea–formaldehyde) microcapsules encapsulated linseed oil and benzotriazole Type de document : texte imprimé Auteurs : Gan Cui, Auteur ; Feiyu Chen, Auteur ; Chuchu Zhang, Auteur ; Jianguo Liu, Auteur ; Xing Xiao, Auteur ; Zili Li, Auteur Année de publication : 2023 Article en page(s) : p. 1977-1996 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Benzotriazole Copolymère urée formaldéhyde Encapsulation Epoxydes Huile de lin L'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. Microcapsules Oxyde de graphène Revêtement autoréparant Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, two-component microcapsules were prepared with benzotriazole (BTA) and linseed oil as the core material and poly(urea–formaldehyde) as the shell material. The effects of stirring speed, temperature, type and amount of emulsifier, core/shell mass ratio, and initial pH on the microcapsule structure and properties were studied, and the optimal preparation process of the two-component microcapsules was obtained. On this basis, the shell stability of the microcapsules was enhanced by adding graphene oxide (GO), and the added content of GO was optimized by means of microscopic observation. The results show that the optimal preparation process of the two-component microcapsules is as follows: The stirring speed is 500 r/min, the temperature is 55°C, the amount of polyvinyl alcohol is 5 g, core/shell mass ratio is 1.25:1, the initial pH is 3, the added amount of GO is 0.3 wt%, and the encapsulation rate of the prepared microcapsules was as high as 83.44%. Subsequently, different contents of graphene-based two-component microcapsules were embedded into the epoxy coating, and the best ones were optimized by self-healing performance test (scratch test) and anticorrosion performance test (salt spray test and electrochemical impedance spectroscopy). The experimental results show that the impedance modulus of the damaged graphene-based two-component self-healing coating after repair can reach 1.29 × 109 Ω cm2, and the repair process can last for 24 h. Note de contenu : - EXPERIMENTAL : Materials - Preparation of graphene-based two-component microcapsules - Preparation of graphene-based two-component self-healing coatings - Characterization - RESULTS AND DISCUSSION : Process optimization of two-component microcapsules - Preparation optimization and performance characterization of graphene-based two-component microcapsules - Self-healing and anticorrosion properties of graphene-based two-component self-healing coatings - Table 1 : Equivalent circuit fitting values of ER, 10-MCs/ER, and 10-GO-MCs/ER DOI : https://doi.org/10.1007/s11998-023-00791-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00791-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40175 [article]

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Low-cost fabrication and physicochemical characterization of ZnFe2O4 nanoparticles as an efficient multifunctional inorganic pigment / Mostafa A. Sayed in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1997-2006 Titre : Low-cost fabrication and physicochemical characterization of ZnFe2O4 nanoparticles as an efficient multifunctional inorganic pigment Type de document : texte imprimé Auteurs : Mostafa A. Sayed, Auteur ; W. M. A. Abdelmaksoud, Auteur ; Said M. Teleb, Auteur ; Adel M. El-Din, Auteur ; Mohamed M. Abo-Aly, Auteur Année de publication : 2023 Article en page(s) : p. 1997-2006 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Composés inorganiques -- Synthèse Essais (technologie) Evaluation Ferrites de zinc Formulation (Génie chimique) Pigments inorganiques Revêtements protecteurs Revêtements:Peinture Spectroscopie d'impédance électrochimique Test d'immersion Index. décimale : 667.9 Revêtements et enduits Résumé : The pursuit of low-cost manufacturing of newly effective pigments is a pressing economic need. Thus, in this work, low-cost ZnFe2O4 spinel nanoparticles (ZF-NPs) with an average diameter of 20 nm were successfully synthesized using a simple sol–gel method, which can be extended for large-scale fabrication of a reddish nano pigment. TGA/DTA, XRD, DRS, HRTEM, and SEM/EDX investigations were used to characterize the as-prepared product. The color of synthesized NPs was studied using CIE L*a*b* colorimetric method with color coordinates of L* = 41.7, a* = 72.2, and b* = 48.8. The newly developed pigment was examined to be superior to the traditional pigment (M6001/Fe2O3: L* = 30.4, a* = 42.16, and b* = 45.7). After that, the synthesized nano pigment was integrated into both ink and paint formulations as a multifunctional coating. The inclusion of synthesized nano pigment in metal coating printing ink formulation was done to produce a good alternative and cost-effective substitute for the commercially available pigment used in the inks industry. Also, the effect of the fabricated nanoparticles on corrosion resistance and thermal stability of epoxy-based paint formulations was evaluated using different standard tests. Therefore, the ZnFe2O4 pigment should be applied as a highly efficient inorganic nano pigment. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of ZnFe2O4 NPs - Instrumentation - Pigment evaluation - Corrosion tests - RESULTS AND DISCUSSION : Characterization of the fabricated ZF-NPs - Applications of the synthesized ZF nano pigment - Table 1 : CIE L*a*b* color coordinates of synthesized ZF and M6001 pigments - Table 2 : Metal coating ink formulations according to Pachin company - Table 3 : Paint formulation incorporating ZF nano pigment - Table 4 : Corrosion results of the coated film after immersion in 3.5% NaCl for 28 days - Table 5 : EIS data of the ZF-NPs-coated film Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40176 [article]

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Synthesis of acrylic-modified water-reducible alkyd resin: improvement of corrosion resistance in painting formulations / Figen Aynali in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2007-2017 Titre : Synthesis of acrylic-modified water-reducible alkyd resin: improvement of corrosion resistance in painting formulations Type de document : texte imprimé Auteurs : Figen Aynali, Auteur ; Gürcan Sakar, Auteur ; Elif Suna Kocyigit, Auteur ; Alper Kades, Auteur Année de publication : 2023 Article en page(s) : p. 2007-2017 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylique Adhésion Anticorrosifs Anticorrosion Caractérisation Matériaux -- Modifications chimiques Monomères Organosilanes Polyalkydes Polymères -- Synthèse Revêtements -- Effets de l'humidité:Peinture -- Effet de l'humidité Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements organiques Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, we investigated the effect of organosilane monomer on the adhesion strength and corrosion protection of the water-reducible alkyd coatings. For this purpose, firstly, alkyd resin was synthesized and modified with acrylic monomers by changing organosilane monomer content in the range of 4–16 wt% in all acrylic monomer compositions. Then, the carboxyl groups on the hybrid resins were neutralized with a base and the coating recipes were formulated using these water-reducible resins. The chemical structure and composition of the synthesized polymers were confirmed using 1H-NMR and FTIR spectroscopies. Mechanical properties of coatings applied on the cold-rolled steel surfaces were investigated via crosshatch adhesion, pendulum hardness, gloss, impact, and conical mandrel bend tester. According to the results, it can be said that water-reducible acrylic-modified alkyd coatings offer a good balance of hardness and flexibility. Then, the line was scratched parallel to the coating system and the surface coating properties of the coated panels, such as the adhesion strength after being exposed to humidity and corrosion resistance, were comparatively investigated. The best results for corrosion resistance and adhesion strength were obtained with the coating which was formulated with the resin having organosilane monomer of 8 wt% in all acrylic monomer mixtures. As the organosilane monomer amount increased to 16 wt%, the coatings’ corrosion resistance and adhesion strength decreased. As a result, it was observed that organosilane modification is significantly effective in improving the adhesion strength and corrosion resistance of water-reducible alkyd coatings. However, increasing the amount of silane monomer may reverse the positive results obtained. This study also reveals significant results about the correlation between the adhesion strength and corrosion resistance of coatings by presenting visual results. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of water-reducible acrylic-modified alkyd resin - Characterization - RESULTS AND DISCUSSION : Resin - Coating - Table 1 : The recipe for acrylic modification of alkyd resin - Table 2 : The properties of synthesized acrylic-modified alkyd resins, VTMS % (wt.) in acrylic monomer composition - Table 3 : Mechanical properties of coatings applied on the CRS surfaces - Table 4 : Adhesion results of all panels after exposure to humidity DOI : https://doi.org/10.1007/s11998-023-00795-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00795-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40177 [article]

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Robust patterned superoleophobic platform for efficient water harvesting / Pan Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2019-2029 Titre : Robust patterned superoleophobic platform for efficient water harvesting Type de document : texte imprimé Auteurs : Pan Li, Auteur ; Chenyang Zhao, Auteur ; Shan Peng, Auteur Année de publication : 2023 Article en page(s) : p. 2019-2029 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amphiphobie Brouillard Eau - Récupération Hydrophilie Morphologie (matériaux) Oléophobie Procédés de fabrication Index. décimale : 667.9 Revêtements et enduits Résumé : With the development of global industry and the increase of population, the shortage of freshwater resources has become a serious global challenge to the sustainable development of human society, prompting in-depth research on advanced water-harvesting technologies. However, the existing methods have many defects, such as easy pollution, insufficient water transportation speed, low water collection efficiency, complex preparation process, expensive raw materials, and so on. Here, inspired by natural organisms, such as beetles and cactus thorns, a new patterned surface combining a superamphiphobic region and a triangular fluorosurfactant (capstone FS50)-modified hydrophilic region has been designed for efficient and rapid water collection and condensation. The superamphiphobic part has an efficient water transmission capacity. On the one hand, owing to a good hydrophilic property, the FS50-modified part efficiently collects fog droplets that are further condensed into much larger water droplets. On the other hand, many large water drops condensed on the superamphiphobic region easily roll onto the hydrophilic FS50-modified surface, and form much larger droplets when combined with the original ones. The patterned surface achieves a very large water collection rate (WCR) of 20.6 mg min−1 cm−2, which is much larger than others reported in previous papers, while it is 1.5 and 1.3 times than that of single superamphiphobic and FS50-modified surfaces. Since both the patterns show superior oil repellency, it presents good resistance to organic pollution, resulting in very superior chemical stability and recyclability. Even after water collection for 60 cycles, the patterned surface can still reach a WCR value of 18 mg min−1 cm−2. The patterned surfaces also collect acid fog, alkali fog, and hot water fog when their WCR values are 20.1, 19.8, and 20.5 mg min−1 cm−2, respectively. This work has found a new patterned superoleophobic surface for efficient water collection, which achieves robust mechanical durability and chemical stability. Note de contenu : - MATERIALS AND METHODS : Materials - Fabrication methods of various samples - RESULTS AND DISCUSSION : Fabrication process of the patterned surface - Morphology and composition of the patterned surface - Wettability summary and demonstration of the patterned surface - Water collection processes of diverse samples - Various critical parameters about water collection capability of diverse specimens - Designed origin of patterned surface and mechanisms of water collection behaviors for diverse specimens - Mechanical durability and chemical stability of superamphiphobic surfaces - Acid fog, alkali fog, and hot water collection processes by the patterned surfaces - Table 1 : Summary of CAs and SAs of various samples DOI : https://doi.org/10.1007/s11998-023-00796-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00796-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40178 [article]

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Preparation of UV-curable nano-SiO2/ acrylate coatings modified by P-containing LEPB and their applications on plywood / Xiaojing LV in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2031-2044 Titre : Preparation of UV-curable nano-SiO2/ acrylate coatings modified by P-containing LEPB and their applications on plywood Type de document : texte imprimé Auteurs : Xiaojing LV, Auteur ; Jinwei Wang, Auteur ; Yong Guo, Auteur ; Yanxin Guo, Auteur Année de publication : 2023 Article en page(s) : p. 2031-2044 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs Caractérisation Composés organiques -- Synthèse Dioxyde de silicium Nanoparticules Phosphore Polyacryliques Polybutadiène époxydé Résistance à l'humidité:Résistance à l'eau Résistance à l'usure Résistance à la flamme Résistance aux taches Revêtements -- Additifs Revêtements -- Propriétés mécaniques Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Phosphorus-containing liquid epoxidate polybutadiene (PDCP-LEPB) is synthesized and used as a reactive additive to improve the water, wear and fire resistance of UV-curable acrylate coatings containing nano-SiO2 as a filler. The structure of PDCP-LEPB and the curing condition are confirmed by Fourier transform infrared spectroscopy (FTIR). The addition of PDCP-LEPB should be controlled at around 10% as shown by thermal stability measurements; with the addition of PDCP-LEPB, composites show earlier degradation to release flame-retardant components, and thus the fire resistance of plywood is improved when its surface is applied by the composite coatings containing PDCP-LEPB. Besides, the fire protecting ability can be greatly enhanced with SiO2 addition due to the synergistic effect of P, Si and Cl coexistence in the matrix. The addition of PDCP-LEPB improves the water resistance of plywood as reflected by the water absorption rates, contact angle measurements and stain resistance test due to the hydrophobic nature of olefin backbone and increment of crosslinking density; the addition of nano-SiO2 has a much more positive effect on the improvement in their stain resistance and wear resistance due to the increase in surface roughness and stiffness, respectively. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of PDCP-LEPB - Preparation of UV-curable samples - Characterizations - RESULTS AND DISCUSSION : Characterization of PDCP-LEPB - Thermal stability and fire resistance evaluation - Water and stain resistance - Mechanical performances - Table 1 : The mass variations of each formula of modified UV-curable polyacrylates - Table 2 : Absorption assignments for FTIR spectra of LEPB, PDCP and PDCP-LEPB - Table 3 : Absorption assignments for FTIR spectra of PDCP-LEPB, neat acrylate and cured composites - Table 4 : TGA data based DOI : https://doi.org/10.1007/s11998-023-00799-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00799-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40179 [article]

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Facile synthesis of BaSO4@SiO2@TiO2 composites and its coating mechanism analysis / Guangyan Hu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2045-2052 Titre : Facile synthesis of BaSO4@SiO2@TiO2 composites and its coating mechanism analysis Type de document : texte imprimé Auteurs : Guangyan Hu, Auteur ; Shengming Jin, Auteur ; Kun Liu, Auteur Année de publication : 2023 Article en page(s) : p. 2045-2052 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Composés inorganiques -- Synthèse Composites Dioxyde de silicium Dioxyde de titane Enrobage (technologie) Sulfate de baryum Index. décimale : 667.9 Revêtements et enduits Résumé : Herein, SiO2-coated BaSO4 powders were prepared by a liquid phase deposition method starting from inexpensive Na2SiO3, and a rutile TiO2 film was subsequently coated on the surface of SiO2 using TiOSO4 as the raw material. Under the optimum experimental conditions, the BaSO4@SiO2@TiO2 composite showed a refraction index of 1.90 and a whiteness of 92.4. The morphology of the cladding film showed that the composites were well dispersed with a small amount of agglomeration. X-ray diffraction (XRD) and transmission electron microscopy (TEM) analysis indicated that a uniform-coated layer of dense TiO2 film on the surface of BaSO4 particles was achieved by coating an amorphous SiO2 interlayer. The electron binding energy and relative intensity of Ti 2p, Si 2p, Ba 3d, and O 1s as a function of the coating process were obtained by X-ray photoelectron spectroscopy (XPS) analysis. The coating mechanism of SiO2 on the surface of the BaSO4 particles and the coating process of TiO2 on the surface of SiO2 were explored. SiO2 formed at the early stage of the reaction was coated on the surface of BaSO4 by electrostatic adsorption, and the TiO2 produced by hydrolysis at the later stage was coated on the surface of SiO2 by chemical bonding, generating Ti-O-Si bonds at the interface between SiO2 and TiO2 particles, as well as a continuous dense TiO2 film by continuing the condensation reaction. A simple process and inexpensive raw materials were employed to realize the facile synthesis of BaSO4@SiO2@TiO2 composites with good dispersion and high whiteness, greatly reducing the amount of TiO2 used and the production cost, which has important guiding significance for production within the coating industry. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of BaSO 4 @SiO 2 @TiO 2 - CHARACTERIZATION METHODS : X-ray diffraction analysis - Scanning electron microscopy investigation - Transmission electron microscopy analysis - X-ray photoelectron spectroscopy analysis - RESULTS AND DISCUSSION DOI : https://doi.org/10.1007/s11998-023-00800-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00800-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40180 [article]

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High-strength and high-toughness spray-type polyurea coating for impact protection of aluminum sheet / Hui Guo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2053-2068 Titre : High-strength and high-toughness spray-type polyurea coating for impact protection of aluminum sheet Type de document : texte imprimé Auteurs : Hui Guo, Auteur ; Mingsheng Yin, Auteur ; Xiao Lv, Auteur ; Yu Chen, Auteur ; Minqian Sun, Auteur Année de publication : 2023 Article en page(s) : p. 2053-2068 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. Analyse des défaillances (fiabilité) Essais de résilience Métaux -- Revêtements protecteurs Polyurée Résistance au chocs Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : This study aims to synthesize polyurea coating material with superior impact resistance for protecting aluminum sheets. Polyurea was synthesized with various ratios of amino-terminated polyether and amine chain extender using the semi-prepolymer method. The optimal composition ratio of polyurea with excellent impact resistance was determined by comparing the basic properties and the quasi-static and dynamic tensile mechanical properties of polyurea. A high-strength and high-toughness polyurea was applied to the aluminum sheet's surface using a high-temperature and high-pressure spraying machine, resulting in a polyurea-coated aluminum sheet. Its protective performance was tested under impact load using split Hopkinson pressure bar method. The effects of different polyurea coating methods on the failure morphology, velocity effect, and energy dissipation law of aluminum sheets were analyzed to guide the engineering application. The research findings demonstrate that coating polyurea on aluminum sheets' front face (load-receiving face) can alleviate stress concentration during the impact process of flat warheads on aluminum sheets and improve the punching shear resistance of aluminum structures. The critical velocity of aluminum sheets can be improved by coating polyurea on the front face and both faces. Moreover, polyurea coating on the load-receiving face of aluminum sheets can improve energy consumption efficiency. The impact resistance of aluminum sheets with different hardness polyurea coatings was further analyzed through finite element simulation. In engineering design, we recommend using harder polyurea on the front face and softer polyurea on the opposite side of the aluminum sheet based on our simulations. Note de contenu : - EXPERIMENT : Polyurea preparation - Experimental scheme - RESULTS AND DISCUSSION : Performance analysis of polyurea - Failure morphology analysis of polyurea-coated aluminum sheets - Velocity effect analysis of polyurea-coated aluminum sheets - NUMERICAL STUDY ON THE EFFECT OF DIFFERENT HARDNESS POLYUREA ON THE PROTECTIVE PERFORMANCE OF ALUMINUM SHEETS - Table 1 : Basic performance of new polyurea coating - Table 2 : Failure modes of four types of test pieces under different impact speeds - Table 3 : Approximate critical velocity of four types of composite sheets and velocity drop per unit area density of each material layer - Table 4 : Energy consumption and energy consumption per unit area density of four types of sheets and each material layer - Table 5 : Model parameter values for numerical simulation DOI : https://doi.org/10.1007/s11998-023-00801-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00801-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40181 [article]

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Mechanical-induced functionalization of graphene with sodium carboxymethyl cellulose toward enhancing anticorrosion performance of waterborne epoxy coatings / Rui Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2069-2080 Titre : Mechanical-induced functionalization of graphene with sodium carboxymethyl cellulose toward enhancing anticorrosion performance of waterborne epoxy coatings Type de document : texte imprimé Auteurs : Rui Wang, Auteur ; Hongling Yi, Auteur Année de publication : 2023 Article en page(s) : p. 2069-2080 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption Anticorrosifs Anticorrosion Caractérisation Carboxyméthylcellulose de sodium Dispersions et suspensions Epoxydes Graphène Le 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. Revêtements -- Propriétés mécaniques Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Non-covalent modification of graphene is prepared by sodium carboxymethyl cellulose via ball milling. Adsorption and thermogravimetric analyzer (TG) indicate interaction of graphene with sodium carboxymethyl cellulose. Particle size and zeta potential results show sodium carboxymethyl cellulose with high DS play more role in assisting stabilization of graphene dispersion. The adsorption of sodium carboxymethyl cellulose onto graphene is inhibited under acidic conditions and the dispersion stability deteriorates sharply. Under neutral and alkaline conditions, the dispersions maintain stable. Embedding a small percentage of well-dispersed graphene nanosheets (CGr1.5%) in waterborne epoxy coating has remarkably improved anticorrosion performance, which is attributed to the synergistic effects of barrier properties of well-dispersed graphene nanosheets and CMC in the epoxy matrix. Open circuit potential (OCP), Tafel and electrochemical impedance spectroscopy (EIS) analysis confirmed that the corrosion rate exhibited by composite coatings with 1.5 wt% graphene is lower than that of neat epoxy coating. Note de contenu : - EXPERIMENTAL : Materials - Adsorption measurements - Preparation of CMC-graphene dispersion - Fabrication of coatings - Testing and characterization - RESULTS AND DISCUSSION : Adsorption isotherm for CMC on graphene with different degree of substitution (DS) - TGA - Particle size distribution - Effect of CMC substitution degree on zeta potential of graphene dispersions - Morphology - Effect of pH on CMC graphene dispersion stability - Coating mechanical properties - Table 1 : Parameters of adsorption isotherm models of CMC with different DS - Table 2 : Mechanical properties of CMC-graphene epoxy coatings Coating corrosion resistance - Table 3 : Polarization parameters of coatings with different CGr contents in 3.5% NaCl solution DOI : https://doi.org/10.1007/s11998-023-00802-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00802-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40182 [article]

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Using electrically conductive polyaniline/polyvinyl alcohol hydrogel electrodes to perform electrodeposition of polysaccharides / Qinghua Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2081-2089 Titre : Using electrically conductive polyaniline/polyvinyl alcohol hydrogel electrodes to perform electrodeposition of polysaccharides Type de document : texte imprimé Auteurs : Qinghua Wang, Auteur ; Yan Yang, Auteur ; Xiaoli Zhang, Auteur ; Tingxue Li, Auteur ; Zequan Xu, Auteur ; Jiangtao Tao, Auteur ; Zongming Chen, Auteur ; Yifeng Wang, Auteur Année de publication : 2023 Article en page(s) : p. 2081-2089 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool polyvinylique Caractérisation Conducteurs organiques Conduction électrique Dépôt électrolytique hydrocolloïdes Polyaniline Polysaccharides Les polysaccharides (parfois appelés glycanes, polyosides, polyholosides ou glucides complexes) sont des polymères constitués de plusieurs oses liés entre eux par des liaisons osidiques. Les polyosides les plus répandus du règne végétal sont la cellulose et l’amidon, tous deux polymères du glucose. De nombreux exopolysaccharides (métabolites excrétés par des microbes, champignons, vers (mucus) du ver de terre) jouent un rôle majeur - à échelle moléculaire - dans la formation, qualité et conservation des sols, de l'humus, des agrégats formant les sols et de divers composés "argile-exopolysaccharide" et composites "organo-minéraux"(ex : xanthane, dextrane, le rhamsane, succinoglycanes...). De nombreux polyosides sont utilisés comme des additifs alimentaires sous forme de fibre (inuline) ou de gomme naturelle. Ce sont des polymères formés d'un certain nombre d'oses (ou monosaccharides) ayant pour formule générale : -[Cx(H2O)y)]n- (où y est généralement x - 1). On distingue deux catégories de polysaccharides : Les homopolysaccharides (ou homoglycanes) constitués du même monosaccharide : fructanes, glucanes, galactanes, mannanes ; les hétéropolysaccharides (ou hétéroglycanes) formés de différents monosaccharides : hémicelluloses. Les constituants participant à la construction des polysaccharides peuvent être très divers : hexoses, pentoses, anhydrohexoses, éthers d'oses et esters sulfuriques. Selon l'architecture de leur chaîne, les polysaccharides peuvent être : linéaires : cellulose ; ramifiés : gomme arabique, amylopectine, dextrane, hémicellulose et mixtes : amidon. Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Here, electrically conductive polyaniline/polyvinyl alcohol (PANI/PVA) hydrogels were prepared. Subsequently, the PANI/PVA hydrogels were used as electrodes to perform electrodeposition of polysaccharides. The experimental results indicate that the resulting PANI/PVA hydrogel is homogeneous and stable. FTIR results suggest the existence of PANI in the hydrogel. XRD analysis suggests an amorphous structure of PANI in the hydrogel. EIS spectrum shows that the PANI/PVA hydrogel is conductive. SEM observation reveals that the PANI/PVA hydrogel presents a porous microstructure. The results from electrodeposition of polysaccharides illustrate that when using the PANI/PVA hydrogels as electrodes, both cathodic electrodeposition of chitosan and anodic electrodeposition of sodium alginate can be achieved, and codeposition of carbon dots (or sodium fluorescein) with polysaccharides can be conducted to obtain nanocomposite films (or fluorescent films). Moreover, the PANI/PVA hydrogel electrodes present good flexibility and formability, which can be conveniently employed to produce electrodeposited polysaccharide films with special shapes and three-dimensional shapes. In this study, for the first time the PANI/PVA hydrogel is utilized as electrode for electrodeposition of polysaccharides. Thus, this study develops a novel flexible electrode based on the electrically conductive hydrogel to perform electrodeposition of polysaccharides, which is promising for applications in functional films and flexible devices. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Chemicals and materials - Preparation of electrically conductive hydrogel electrodes - Electrodeposition of polysaccharides using electrically conductive hydrogel electrodes - Codeposition of polysaccharides using electrically conductive hydrogel electrodes - Preparation of electrodeposited polysaccharides films with three-dimensional shape - Characterization - RESULTS AND DISCUSSION : Fabrication of electrically conductive hydrogel electrodes - Electrodeposition of polysaccharides using PANI/PVA hydrogel electrodes - Properties of PANI/PVA hydrogel electrodes DOI : https://doi.org/10.1007/s11998-023-00803-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00803-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40183 [article]

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Superhydrophilic multifunctional antifogging coatings based on triethoxysilyl-terminated poly(N-vinylpyrrolidone) / Fangfei Meng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2091-2099 Titre : Superhydrophilic multifunctional antifogging coatings based on triethoxysilyl-terminated poly(N-vinylpyrrolidone) Type de document : texte imprimé Auteurs : Fangfei Meng, Auteur ; Wenjin Wang, Auteur ; Yijia Yu, Auteur ; Wenjuan Xia, Auteur ; Ling Wang, Auteur ; Zhaoqiang Wu, Auteur ; Hong Chen, Auteur Année de publication : 2023 Article en page(s) : p. 2091-2099 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Auto-nettoyage Caractérisation Enrobage (technologie) Essais d'adhésion Hydrophilie Polymères -- Synthèse Polyvinylpyrrolidone Revêtements anti-buée Revêtements organiques Surfaces fonctionnelles Transparence (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : A simple and convenient strategy for fabricating superhydrophilic multifunctional antifogging coatings was developed by hydrolyzing triethoxysilyl-terminated poly(N-vinylpyrrolidone) (TRES-PVP) with tetraethyl orthosilicate (TEOS) under acidic conditions. These antifogging coatings can be easily obtained by coating TRES-PVP hydrolysates on substrates at room temperature and then curing by thermal treatment. The superhydrophilic transparent coatings exhibited excellent antifogging, self-cleaning and antifouling properties. Additionally, the coatings also have good adhesion against the cross-cut test and remain stable after exposure to the laboratory environment for five months or immersion in water at room temperature for 20 days. Therefore, the present TRES-PVP hydrolysate coatings are promising for practical multifunctional antifogging applications. Note de contenu : - EXPERIMENTAL : Materials - Instruments and characterization - Preparation of the small molecular initiator (APTES-Br) - Preparation of TRES-PVP polymer - Preparation of multifunctional antifogging coatings - Adhesion tests - Antifogging property of the coating - Stability assessment - Self-cleaning tests - Antifouling property of the coating - RESULTS AND DISCUSSION : Synthesis of TRES-PVP polymers - Preparation and characterization of the TRES-PVP coating - Antifogging properties - Adhesive properties of TRES-PVP coatings - Stability of the TRES-PVP coating - Self-cleaning property - Antifouling property DOI : https://doi.org/10.1007/s11998-023-00805-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00805-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40184 [article]

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Preparation of underwater superoleophobic SiO2/CS/PVA coating on 304 stainless-steel mesh with excellent oil-water separation performance and stability / Pu Gong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2101-2112 Titre : Preparation of underwater superoleophobic SiO2/CS/PVA coating on 304 stainless-steel mesh with excellent oil-water separation performance and stability Type de document : texte imprimé Auteurs : Pu Gong, Auteur ; Enyang Liu, Auteur ; Sirong Yu, Auteur ; Kang Wang, Auteur ; Wei Li, Auteur ; Mingshan Zhang, Auteur ; Yuanji Song, Auteur ; Huaisen Li, Auteur ; Daijun Sun, Auteur ; Wei Xiong, Auteur ; Bingying Wang, Auteur Année de publication : 2023 Article en page(s) : p. 2101-2112 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable Alcool polyvinylique Chitosane Le chitosane ou chitosan est un polyoside composé de la distribution aléatoire de D-glucosamine liée en ß-(1-4) (unité désacétylée) et de N-acétyl-D-glucosamine (unité acétylée). Il est produit par désacétylation chimique (en milieu alcalin) ou enzymatique de la chitine, le composant de l'exosquelette des arthropodes (crustacés) ou de l'endosquelette des céphalopodes (calmars...) ou encore de la paroi des champignons. Cette matière première est déminéralisée par traitement à l'acide chlorhydrique, puis déprotéinée en présence de soude ou de potasse et enfin décolorée grâce à un agent oxydant. Le degré d'acétylation (DA) est le pourcentage d'unités acétylées par rapport au nombre d'unités totales, il peut être déterminé par spectroscopie infrarouge à transformée de Fourier (IR-TF) ou par un titrage par une base forte. La frontière entre chitosane et chitine correspond à un DA de 50 % : en deçà le composé est nommé chitosane, au-delà, chitine. Le chitosane est soluble en milieu acide contrairement à la chitine qui est insoluble. Il est important de faire la distinction entre le degré d'acétylation (DA) et le degré de déacétylation (DD). L'un étant l'inverse de l'autre c'est-à-dire que du chitosane ayant un DD de 85 %, possède 15 % de groupements acétyles et 85 % de groupements amines sur ses chaînes. Le chitosane est biodégradable et biocompatible (notamment hémocompatible). Il est également bactériostatique et fongistatique. Le chitosane est également utilisé pour le traitement des eaux usées par filtration ainsi que dans divers domaines comme la cosmétique, la diététique et la médecine. Dioxyde de silicium Dip-coating Métaux -- Revêtements protecteurs Oléophobie Revêtements -- Stabilité Revêtements organiques Séparation huile/eau Index. décimale : 667.9 Revêtements et enduits Résumé : The wide application prospect of super-wetting materials in the field of oil–water separation has aroused extensive scholarly interest. With the aid of SEM, EDS, and FTIR, it was proved that the SiO2/CS/PVA underwater superoleophobic coating was successfully prepared by etching and dip coating. The surface of the coating formed a mountain-like microstructure and with the extension of etching time, the roughness of the mountain-like microstructure increased. After more than 10 min of etching, the roughness of microstructure was basically unchanged and the underwater OCA was as high as 160.3°. The results indicated that 10 min was the best time for etching reaction. The performance of oil–water separation was tested. The separation efficiency after 50 separation cycles was still more than 98.5%. The results showed that the coating had excellent oil–water separation performance and separation cycle characteristics. The stability of the SiO2/CS/PVA underwater superoleophobic coating was tested. After being placed in acidic solution, alkaline solution or air, the underwater OCA of the coating was higher than 155° and the oil–water separation efficiency was as high as 98%. The experimental results proved the excellent long-term and pH stability. In addition, the coating had self-cleaning ability and low adhesion performance, which can arrest oil phase pollution. Note de contenu : - EXPERIMENTAL : Materials - Preparation of SiO2/CS/PVA underwater superoleophobic coating - RESULTS AND DISCUSSION : Interaction of CS/PVA/GA - Chemical composition - Micromorphology - Wettability - Low adhesion property - Self-cleaning property - Oil-water separation performance - Stability of SiO2/CS/PVA coating DOI : https://doi.org/10.1007/s11998-023-00807-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00807-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40185 [article]

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Thermal stability of cyanate ester modified silicone rubber as matrix of heat-resistant composite coatings / Qing Wen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2113-2123 Titre : Thermal stability of cyanate ester modified silicone rubber as matrix of heat-resistant composite coatings Type de document : texte imprimé Auteurs : Qing Wen, Auteur ; Xiao-Jun Yang, Auteur ; Ding-Yong He, Auteur ; Han-Guang Fu, Auteur Année de publication : 2023 Article en page(s) : p. 2113-2123 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Allongement à la rupture Caractérisation Elastomères silicones vulcanisables à chaud Ester de cyanate Formulation (Génie chimique) Matrices Résistance à la traction Résistance thermique Revêtements -- Propriétés mécaniques Revêtements organiques Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Heat-resistant composites are widely used as high-temperature engineering materials. Polymer materials are often used as the matrix of the composites due to their good processability and adhesion to different substrates. In order to improve the thermal stability of silicone rubber (SR) matrix, CE/SR composites were prepared from cyanate ester (CE) prepolymer and silicone. The chemical structure, morphology and thermal stability of the obtained CE/SR composites were analyzed by Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis (TGA). SEM images of the cross sections of CE/SR show that a two-phase microstructure consisting of continuous SR and dispersed CE can be formed by successively curing of silicone and CE prepolymer. TGA analysis results show that CE modified SR has higher heat resistance than SR, and the thermal stability of CE/SR composites is better than that of pure SR and pure CE in the temperature range of 300–500 °C. The composite of KL and CE/SR was prepared to further improve the heat resistance. Note de contenu : - EXPERIMENTAL : Experimental materials - Preparation of CE/SR and KL/CE/SR - Characterization - RESULTS AND DISCUSSION : FTIR analysis of CE/SR samples - Microstructure of CE/SR and KL/CE/SR samples - Thermal stability of CE/SR and KL/CE/SR samples - Mechanical property of CE/SR samples - Adhesion of CE/SR and KL/CE/SR to the surface of steel - Table 1 : Formulation compositions (phr by mass) of CE/SR and KL/CE/SR samples - Table 2 : TGA analysis results of CE, SR, CE/SR and KL/CE/SR - Table 3 : The Shore hardness of SR and CE/SR samples before and after heat treatment - Table 4 : Tensile strength and elongation at break of CE/SR samples (without heat treatment) - Table 5 : Adhesion gradings of CE, SR, CE/SR and KL/CE/SR on the surface of steel DOI : https://doi.org/10.1007/s11998-023-00808-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00808-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40186 [article]

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Insights into the composite coating for improving the weatherability of TiO2 white pigments / Ying Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2125-2133 Titre : Insights into the composite coating for improving the weatherability of TiO2 white pigments Type de document : texte imprimé Auteurs : Ying Wang, Auteur ; Yangsong Chen, Auteur ; Ling Yang, Auteur ; Jincheng Jian, Auteur ; Shanshan Liu, Auteur ; Shiguang Guo, Auteur ; Wei Cui, Auteur ; Tao He, Auteur Année de publication : 2023 Article en page(s) : p. 2125-2133 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites Dioxyde de titane Photoélectrochimie Pigments inorganiques Résistance aux conditions climatiques Revêtements inorganiques Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Several inorganic coatings, such as ZrO2, SiO2, Al2O3, and AlPO4, have been utilized in the TiO2 pigment industry in order to reduce the natural photoactivity of TiO2 nanoparticles. However, the different role of each material in impacting the TiO2 photoactivity lacks comparative studies, and this is critical to provide a composite coating strategy for TiO2 pigments to achieve optimal weatherability. Our work has shown that each of these coating materials plays a unique role in suppressing the TiO2 photoactivity. For instance, ZrO2 and AlPO4 increase the rate of charge recombination, while SiO2 reduces it. By comparing and analyzing their effects on the charge carrier processes, we have designed and created a composite-coated TiO2 pigment that features a sequential deposition of ZrO2, SiO2, and AlPO4. This product has been proved to exhibit excellent weatherability. Note de contenu : - MATERIALS AND METHODS : Materials - Process of AlPO4 coating - Process of Al2O3 coating - Process of zirconia coating - Process of silica coating - Process of composite coating - Photoactivity assessment by methyl orange (MO) photodegradation - Photoelectrochemical (PEC) measurements - RESULTS AND DISCUSSION : Comparison of AlPO4 and Al2O3-coated TiO2 pigments - Investigation on silica- and zirconia-coated TiO2 pigments - Design of composite-coated TiO2 pigments - Table 1 : Effects of single coating layers toward the TiO2 photoactivity DOI : https://doi.org/10.1007/s11998-023-00809-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00809-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40187 [article]

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Robust superhydrophobic composite coating using h-BN/MWCNT via supercritical fluid processing / S. Rajiv in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2135-2141 Titre : Robust superhydrophobic composite coating using h-BN/MWCNT via supercritical fluid processing Type de document : texte imprimé Auteurs : S. Rajiv, Auteur ; Kumaran Shanmugam, Auteur Année de publication : 2023 Article en page(s) : p. 2135-2141 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres de carbone Fluides supercritiques Hydrophobie Nanotubes de carbone à parois multiples Un nanotube de carbone multifeuillet est constitué de plusieurs feuillets de graphènes enroulés les uns autour des autres. Il existe deux modèles pour décrire la structure des nanotubes multifeuillets : - le modèle poupée russe: les plans de graphène sont arrangés en cylindres concentriques ; - le modèle parchemin: un seul feuillet de graphène est enroulé sur lui-même, comme une feuille de papier. Nitrure de bore Le nitrure de bore est un composé chimique du bore et de l'azote, de formule chimique brute BN (nombre égal d'atomes de chaque élément). Le nitrure de bore est isoélectronique avec le carbone et, comme ce dernier, existe sous plusieurs formes polymorphiques, dont l'une est analogue au diamant et l'autre au graphite. La forme diamant est l'un des matériaux les plus durs connus et la forme graphite est un lubrifiant apprécié. De plus, ces deux polymorphes possèdent des propriétés d'absorption radar. Index. décimale : 667.9 Revêtements et enduits Résumé : We employed a quick method of supercritical fluid processing (SCF) to develop superhydrophobic composite coatings by combining h-boron nitride (h-BN) and multiwalled carbon nanotubes (MWCNT) to create hierarchical nanostructures on fiber-reinforced polymer (FRP) sheets. The prepared BN-MWCNT composite coating demonstrated a high-water contact angle of 169.4°. At high magnification, the surface morphologies of the composite coatings revealed that MWCNT was completely covered by BN nanosheets in all directions. The presence of aligned nano- and microsurface roughness in the coating was investigated using an atomic force microscope (AFM). X-ray diffraction (XRD) study revealed that h-BN nanosheets had a marked effect on the phase separation of MWCNT. The remarkable structural stability of the obtained BN-MWCNT superhydrophobic composite coating was validated by Raman spectroscopy. This study found a cost-effective method to create BN-MWCNT composites by applying the SCF approach. DOI : https://doi.org/10.1007/s11998-023-00816-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00816-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40188 [article]

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