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Adhesive properties of an epoxy resin bonding agent modified with waste granite powder / Lukasz Kampa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1303-1316 Titre : Adhesive properties of an epoxy resin bonding agent modified with waste granite powder Type de document : texte imprimé Auteurs : Lukasz Kampa, Auteur ; Agnieszka Chowaniec, Auteur ; Aleksandra Krolicka, Auteur ; Lukasz Sadowski, Auteur Année de publication : 2022 Article en page(s) : p. 1303-1316 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique Déchets industriels -- Recyclage Epoxydes Essais d'adhésion Granite Liaisons chimiques Liants Poudres Résistance à l'arrachement Revêtements de sols Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The article presents the adhesive properties of a new binder based on epoxy resin with the addition of waste granite powder. The binder was modified with granite powder in amounts ranging from 10% to 60% in relation to the weight of the resin. Moreover, a coating was made without the addition of the granite powder in order to compare the obtained results. Previously obtained pull-off test results were also analyzed. The obtained results confirmed that the optimal material solution includes 10% or 20% of granite powder by weight. Additionally, chemical and microstructural analysis was also performed for both the reference sample and the sample modified with 20% of granite powder. The article also presents an explanation of the reasons for such an improvement of pull-off strength, which is based on careful analysis of the adhesive properties of the epoxy resin bonding agent modified with waste granite powder. Moreover, it explains how granite powder particles penetrate into the near-surface layer of the substrate, examines the porosity of the near-surface layer of the substrate using microstructural analysis, and presents the effect of adding waste granite powder to the epoxy resin bonding agent on the chemical properties of the near-surface layer of the substrate. Note de contenu : - MATERIALS AND METHODS : Concrete substrate - Granite powder - Epoxy resin bonding agent - Preparation of the samples - Pull-off strength test - SEM chemical and microstructural analysi - RESULTS : Pull-off strength of the epoxy resin bonding agent - Comparison of the obtained results with other known works - SEM chemical and microstructural analysis - Table 1 : The share of the individual sizes of the aggregate grains that were used to make the concrete substrate - Table 2 : The results of the chemical analysis of the granite powder used for the epoxy resin bonding agent - Table 3 : List of selected modified epoxy coatings DOI : https://doi.org/10.1007/s11998-022-00620-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00620-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38271 [article]

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Corrosion resistance of functionalized carbon nanotubes enhanced epoxy coatings on sintered NdFeB magnets / Hongyi yang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1317-1329 Titre : Corrosion resistance of functionalized carbon nanotubes enhanced epoxy coatings on sintered NdFeB magnets Type de document : texte imprimé Auteurs : Hongyi yang, Auteur ; Liangsong Duan, Auteur ; Pengjie Zhang, Auteur ; Guangqing Xu, Auteur ; Jiewu Cui, Auteur ; Jun Lv, Auteur ; Wei Sun, Auteur ; Bingshan Li, Auteur ; Dongmei Wang, Auteur ; Yucheng Wu, Auteur Année de publication : 2022 Article en page(s) : p. 1317-1329 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Composites à fibres de carbone Epoxydes Essais de résilience Matériaux -- Propriétés fonctionnelles 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. Revêtements organiques Surfaces fonctionnelles Tanins Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, tannic acid (TA) was employed to modify the surface of multiwall carbon nanotubes (CNTs) to form TCNTs hybrids via noncovalent functionalization to enhance its dispersibility in water. Then, the TCNTs enhanced epoxy coatings were applied on sintered NdFeB magnets by cathodic electrophoretic deposition method for corrosion test. The corrosion resistance of prepared specimens was assessed by electrochemical experiments. The results show that TCNTs hybrids present a more homogeneous distribution in epoxy resin than pristine CNTs and could obviously promote anticorrosion properties of prepared specimens. Within 36-day soaking in 3.5 wt.% NaCl solution, the specimens maintain a high value of |Z|0.01Hz (108 Ω cm2) when the concentration of TCNTs is 2 g/L. When immersed in 3.5 wt.% NaCl solution for 40 days, the Ecorr of specimens shifts to − 0.207 V and Jcorr is about 5.281 × 10−11 A cm−2, which demonstrates superior corrosion resistance. Note de contenu : - EXPERIMENT : Materials - Experimental method - Material characterization and corrosion resistance test - RESULTS AND DISCUSSION : Characterization of TCNTs hybrids - Characterization of specimens - Corrosion protection mechanism - Table 1 : Surface chemical composition of CNTs and TCNTs hybrids - Table 2 : |Z|0.01Hz of specimens after being immersed in 3.5 wt.% NaCl solution for different times - Table 3 : Electrochemical polarization parameters of different specimens - Table 4 : Comparation of corrosion protection data of chemical oxidized CNTs enhanced epoxy coatings with this work DOI : https://doi.org/10.1007/s11998-022-00641-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-006241-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38272 [article]

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Parallel measurements and engineering simulations of conversion, shear modulus, and internal stress during ambient curing of a two-component epoxy coating / Qiong Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - P; 1331-1343 Titre : Parallel measurements and engineering simulations of conversion, shear modulus, and internal stress during ambient curing of a two-component epoxy coating Type de document : texte imprimé Auteurs : Qiong Li, Auteur ; Claus Erik Weinell, Auteur ; Søren Kiil, Auteur Année de publication : 2022 Article en page(s) : P; 1331-1343 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique Cinétique chimique Dynamique Epoxydes Modèles mathématiques Réticulation (polymérisation) Revêtements bi-composant Revêtements organiques Rhéologie Taux de retrait Thermodurcissables Index. décimale : 667.9 Revêtements et enduits Résumé : Macroscopic crack initiation and propagation, as a result of internal stress, poses a threat to the performance of protective coatings. In demanding environments, such as corner geometries and saltwater exposure, the cracks may accelerate substrate corrosion and potentially lead to collapse of infrastructure. The present work is focused on the underlying mechanisms of curing-induced internal stress and investigates the dynamics of the parallel processes of crosslinking reactions and evolution of mechanical properties for a solvent and pigment-free epoxy resin cured with a diamine hardener. Experimental techniques, applied at room temperature and constant relative humidity, include attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy, advanced rheometry, dynamic mechanical thermal analysis (DMTA), and a beam deflection device. When taking post-vitrification mobility control into account, the reaction kinetics behind the crosslinking and network development could be simulated with a modified Kamal–Sourour model. In addition, engineering models for simulation of coating modulus, volumetric shrinkage, and internal stress as a function of conversion were proposed and found to be in good agreement with experimental data. This allowed, by comparing the magnitudes of the modulus and the internal stress, for evaluation of whether premature cracks are expected to initiate. Furthermore, we show that the curing-induced internal stress development is strongly influenced by the current coating elastic modulus and film thickness, highlighting the effect of coating property transients. The experimental techniques and engineering modeling tools collected can be used to evaluate, without demanding computational complexities, the simultaneous development of coating modulus and curing-induced internal stress. Note de contenu : - EXPERIMENTAL : Materials and coating preparation - FTIR spectroscopy - Dynamic mechanical thermal analysis (DMTA) measurements - Tensile test - Curing shrinkage measurement - Internal stress measurements - MATHEMATICAL MODELING : Curing kinetics - Chemical strain model - Elastic behavior of coating - RESULTS AND DISCUSSION : Evolution of coating properties during curing - Comparison of model simulations with experimental data DOI : https://doi.org/10.1007/s11998-022-00652-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00652-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38273 [article]

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Polymeric aziridines as benign crosslinkers for water-based coating applications in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1345-1355 Titre : Polymeric aziridines as benign crosslinkers for water-based coating applications Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 1345-1355 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Formulation (Génie chimique) Laque et laquage Morphologie (matériaux) Polyacryliques Polyéthylèneimine Réticulants en phase aqueuse Revêtements en phase aqueuse -- Additifs Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Polymeric aziridines are introduced as a new class of low toxicity two-component crosslinkers for carboxylic resins. Using a combination of industry-standard tests and modern biotechnological approaches, the non-genotoxic nature of these compounds was demonstrated. Mechanical analysis of acrylic films formulated with these polymeric aziridines demonstrated that the high crosslink densities typical for classical aziridine chemistry could be attained. Furthermore, distribution of crosslinker molecules in both wet formulation and dried coating could be controlled by adjusting the stabilizing group of the polymeric aziridine. By tuning this stabilization mechanism, we demonstrated customized functional performance for different coating applications. Note de contenu : - EXPERIMENTAL : Materials - Synthesis - Formulation - DMTA - TTS - Particle size analysis by DLS - Coating preparation for AFM - AFM measurements - Formulation for application testing - RESULTS AND DISCUSSION : Non-mutagenic aziridines - Analysis of network formation - Crosslinker distribution - Application testing - Table 1 : Induction of biomarkers attributed to DNA damage - Table 2 : Application testing results of aziridines in furniture coating formulation - Table 3 : Application testing results of polymeric aziridines in wood lacquer DOI : https://doi.org/10.1007/s11998-022-00626-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00626-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38274 [article]

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Morphological and antimicrobial studies of chitosan/poly(vinyl alcohol)/acyl chloride terminated hyperbranched polyester chemical crosslinked blends / Swaminathan Prabu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1357-1364 Titre : Morphological and antimicrobial studies of chitosan/poly(vinyl alcohol)/acyl chloride terminated hyperbranched polyester chemical crosslinked blends Type de document : texte imprimé Auteurs : Swaminathan Prabu, Auteur ; A. Sultan Nasar, Auteur ; Chickiyan Sivakumar, Auteur Année de publication : 2022 Article en page(s) : p. 1357-1364 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acyle En chimie, un acyle ou un groupement acyle est un radical ou un groupe fonctionnel obtenu en enlevant le groupement hydroxyle d'un acide carboxylique. Le groupement acyle correspondant à un acide carboxylique de formule RCOOH aura pour formule RCO–, où l'atome de carbone et celui d'oxygène sont liés par une double liaison (groupement carbonyle). Parmi les acyles les plus courants, on retrouve les chlorures d'acyle comme le chlorure d'éthanoyle ou encore le chlorure de benzoyle. Ces réactifs sont utilisés en tant que source d'ions acylium, utilisé pour fixer des groupements acyles sur des composés variés difficilement synthétisables directement. Les amides, les esters et les thioesters tout comme les cétones ou encore les aldéhydes. Alcool polyvinylique Alliages polymères Alliages polymères -- Propriétés thermiques Antimicrobiens Caractérisation Chimie analytique 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. Morphologie (matériaux) Polyesters Polymères ramifiés Réticulants Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Chitosan/poly (vinyl alcohol) (CS/PVA) blends were prepared using acyl chloride terminated hyperbranched polyester (ac-HBPE) as chemical crosslinking agent. The structural, morphological, and thermal properties of blends were examined by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The strong inter-hydrogen bonds interaction of blend components were observed using FTIR spectroscopy. XRD studies clearly show that crystallinity of CS was pretentious with increasing amount of ac-HBPE. The nature and chemical interaction of crosslinked CS/PVA blends were studied by SEM. Thermal studies confirmed that the decomposition temperature and melting point of CS/PVA blends could be improved with the addition of crosslinker. The antimicrobial performance of crosslinked CS/ PVA blends were also carried out by disk diffusion method. The results showed that crosslinked CS/PVA blends hold both antibacterial and antifungal properties. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of CS/PVA/ac-HBPE ternary blend - Characterization of CS/PVA/ac-HBPE blend - Antimicrobial evaluation - RESULTS AND DISCUSSION : FTIR analysis of chitosan/PVA/Ac-HBPE ternary blend - X-ray diffraction technique of chitosan/PVA/Ac-HBPE ternary blend - SEM investigation of chitosan/PVA/Ac-HBPE ternary blend - Thermal analysis of chitosan/PVA/Ac-HBPE ternary blend - Antimicrobial activities of chitosan/PVA/Ac-HBPE ternary blend - Table 1 : CS/PVA blends prepared by varying the amount of CS and ac-HBPE - Table 2 : The thermal properties of 1C1L, 1C2L, 1C3L, 2C1L, 2C2L, and 2C3L blends - Table 3 : The antibacterial activity of 1C1L, 1C2L, 1C3L, 2C1L, 2C2L, and 2C3L blends - Table 4 : The antifungal activity of 1C1L, 1C2L, 1C3L, 2C1L, 2C2L, and 2C3L blends DOI : https://doi.org/10.1007/s11998-022-00582-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00582-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38275 [article]

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Preparation and properties of antibacterial styrene-acrylic emulsion containing thiazole structure and its application as coating / Xiaopei Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1365-1379 Titre : Preparation and properties of antibacterial styrene-acrylic emulsion containing thiazole structure and its application as coating Type de document : texte imprimé Auteurs : Xiaopei Zhou, Auteur ; Fang Liu, Auteur ; Shaobo Xiong, Auteur ; Furong Zhou, Auteur ; Hui Xiang, Auteur ; Jingwei He, Auteur Année de publication : 2022 Article en page(s) : p. 1365-1379 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Copolymère styrène acrylique Polymérisation en émulsion Revêtements en phase aqueuse -- Additifs Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : A series of antibacterial styrene-acrylic emulsions (SA-Mn, n = 5, 10, 15, 20) with different contents of 5-(methacryloxy-2-ethoxyaminocarbonyl)methyl-thiazole (MEMT) were successfully synthesized, and SA-M20 was used to prepare a water-based antibacterial coating (PSA-M20). The structures of the films (SA-Mn-F) obtained from SA-Mn were analyzed by Fourier-transform infrared spectrometry using the attenuated total reflectance model (FTIR-ATR). The effects of the MEMT content on the properties of the emulsions and related films were investigated in the aspects of particle size, thermal stability, pencil hardness, adhesive force grade, water resistance, and surface morphology. The results showed that all the emulsions or related films had acceptable properties. The antibacterial and antibacterial durability tests showed that films obtained from emulsions SA-M15, SA-M20, and the coating PSA-M20 had strong and durable antibacterial activity against E. coli and S. aureus. Note de contenu : - EXPERIMENTAL : Materials - Preparation of antibacterial styrene-acrylic emulsion (SA-Mn) - Preparation of antibacterial water-based coating (PSA-M20) - Preparation of films of SA-Mn emulsion (SA-Mn-F), PSA-M20 coating (PSA-M20-F), and PSA-M0 coating (PSA-M0-F) - Characterizations - RESULTS AND DISCUSSION : The ATR-FTIR spectra of SA-Mn-Fs - Properties of SA-Mn emulsions - Properties of SA-Mn-F - Thermal properties of St-BA-AA-MEMT copolymers - Surface morphology of SA-Mn-Fs - Properties of antibacterial water-based coating PSA-M20 - Antibacterial activities of SA-Mn-F, PSA-M20-F and PSA-M0-F - Antibacterial durability of SA-Mn-Fs, PSA-M20-F, and PSA-M0-F - Table 1 : Chemical compositions of synthesized antibacterial styrene-acrylic emulsions with 5-(methacryloxy-2-ethoxyaminocarbonyl)-methyl-thiazole (MEMT) (SA-Mn) - Table 2 : Properties of SA-Mn emulsion (n = 0, 5, 10, 15, 20) - Table 3 : Properties of SA-Mn-Fs (n = 0, 5, 10, 15, 20) - Table 4 : Characteristic temperatures of thermal decomposition and the glass transition temperature (Tg) of St-BA-AA-MEMT copolymers with different content of MEMT - Table 5 : Properties of antibacterial water-based coating PSA-M20 - Table 6 : The results of antibacterial rates of films (SA-Mn-F, PSA-M20-F, PSA-M0-F) against E. coli and S. aureus - Table 7 : Antibacterial rates of films (SA-M0-F, SA-M15-F, SA-M20-F, PSA-M20-F, PSA-M0-F) after being irradiated by a 253.7-nm UV light for 100 h against E. coli and S. aureus - Table 8 : Antibacterial rate of films (SA-M0-F, SA-M15-F, SA-M20-F, PSA-M20-F, PSA-M0-F) after being immersed in water for 7 days against E. coli and S. aureus DOI : https://doi.org/10.1007/s11998-022-00589-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00589-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38276 [article]

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Eco-friendly silane as corrosion inhibitor for dual self-healing anticorrosion coatings / Jialiang Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1381-1391 Titre : Eco-friendly silane as corrosion inhibitor for dual self-healing anticorrosion coatings Type de document : texte imprimé Auteurs : Jialiang Liu, Auteur ; Dashuai Yan, Auteur ; Zhenhua Zhang, Auteur ; Yanli Wang, Auteur ; Dalei Song, Auteur ; Tao Zhang, Auteur ; Jingyuan Liu, Auteur ; Fei He, Auteur ; Meng Zhang, Auteur ; Jun Wang, Auteur Année de publication : 2022 Article en page(s) : p. 1381-1391 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Revêtement autoréparant Revêtements organiques Revêtements protecteurs Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : Corrosion resistance and active protection performance of organic coatings can be improved by incorporation of corrosion inhibitor-loaded nanocontainers. Herein, 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (FTES) as a green corrosion inhibitor was encapsulated in hollow mesoporous silica (HMS). FTES-loaded HMS (FHMS) was embedded in an epoxy coating on the surface of the magnesium (Mg) alloy. Artificial defect in FHMS-loaded epoxy coating was made by needle punching. The long-term anticorrosion behavior and self-healing properties of the modified coating were evaluated by electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). In all cases, FHMS can enhance corrosion resistance of the epoxy coating. Among all the FHMS-loaded coatings, the coating containing 0.5 wt% FHMS (FHMS-0.5%) still exhibits excellent corrosion protection performance after 2688 h of immersion. Meanwhile, it shows superior self-healing ability in the scratched areas. These are attributed to the fact that FTES released from HMS nanoparticles can interact with the epoxy coating and the Mg alloy substrate. Moreover, FTES silane can also form a crosslinked Si-O-Si network by itself. Note de contenu : - EXPERIMENTAL : Materials - Substrate pretreatment - Preparation of HMS and FHMS - Preparation of coatings - Characterization - RESULTS AND DISCUSSION : Characterization of HMS and FHMS - Self-healing properties of different FHMS coatings - Anticorrosion and self-healing mechanism - Table 1 : Textural data for the HMS and FHMS samples DOI : https://doi.org/10.1007/s11998-022-00608-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00608-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38277 [article]

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Dual-curable coatings obtained from multi-functional non-isocyanate polyurethane oligomers / H. R. Asemani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1393-1407 Titre : Dual-curable coatings obtained from multi-functional non-isocyanate polyurethane oligomers Type de document : texte imprimé Auteurs : H. R. Asemani, Auteur ; V. Mannari, Auteur Année de publication : 2022 Article en page(s) : p. 1393-1407 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Décomposition (chimie) Dureté (matériaux) Impédancemétrie Matériaux -- Propriétés fonctionnelles Oligomères Poids moléculaires Polyuréthanes Réticulation à l'humidité Revêtements -- Propriétés mécaniques Revêtements organiques Revêtements sans isocyanates Temps de séchage Index. décimale : 667.9 Revêtements et enduits Résumé : The growing concerns and impending regulations on the usage of monomeric isocyanates in the production of polyurethane resins have led to the introduction of alternative non-isocyanate polyurethane (NIPU) systems. Although two-component NIPU coatings based on the reaction of cyclic carbonates and aliphatic amines have emerged as a promising option, they are still associated with two significant drawbacks: lower crosslinking densities due to reduced functionality of the oligomers and low ambient-temperature reactivity. This study reports the utilization of a hybrid approach to address these drawbacks. Amine-functional NIPU oligomers (NI-PUPA) were synthesized by the reaction of cycloaliphatic amine functional compounds and multi-functional cyclic carbonates in an excess amine molar ratio. After mixing the NI-PUPAs with (3-glycidyloxypropyl) trimethoxysilane (GPTMS), a dual-curable coating could be achieved by ambient curing of amines and epoxies and moisture curing of alkoxy silanes. A comparative experimental design was implemented to evaluate the effect of an additional curing mechanism. The results revealed that the additional moisture curing led to faster ambient curing, faster development of properties, enhanced flexibility even at higher crosslinking densities, and better corrosion resistance. Such advancement could facilitate the future implementation of NIPUs in high-performance ambient-curing coating applications. Note de contenu : - EXPERIMENTAL : Materials - Methods - Testing, characterization, and evaluation - RESULTS AND DISCUSSION : Characterization of NI-PUPAs - Curing characterization - Cured film properties - Table 1 : Molecular weights obtained from GPC analysis in comparison with theoretical values and the values obtained by amine value titration Table 2 : The tack-free and through-dry times of NIPU coatings based on ASTM D5898 standard - Table 3 :Konig pendulum hardness development for NIPU coatings over 7 days of curing time (method: ASTM D4366; unit: number of oscillations) - Table 4 :MEK double-rub development for NIPU coatings over 7 days of curing time - Table 5 :Properties of NIPU coatings after 7 days of curing at ambient conditions - Table 6 :Impedance at low frequencies and pore resistance values obtained from EIS analysis - Table 7 : Decomposition temperatures and residual wt.% obtained by the analysis of TGA thermograms DOI : https://doi.org/10.1007/s11998-022-00614-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00614-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38278 [article]

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Anticorrosion properties of modified basalt powder/epoxy resin coating / Manxia Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1409-1420 Titre : Anticorrosion properties of modified basalt powder/epoxy resin coating Type de document : texte imprimé Auteurs : Manxia Zhang, Auteur ; Xinyi Zhao, Auteur ; Hang Jia, Auteur ; Haoran Xing, Auteur ; Hongjing Zhang, Auteur ; Xinyue Wang, Auteur ; Cheng Liu, Auteur Année de publication : 2022 Article en page(s) : p. 1409-1420 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Basalte Caractérisation Enrobage (technologie) Epoxydes Mesure Poudres Réaction de couplage Revêtements -- Propriétés mécaniques Revêtements organiques Spectroscopie d'impédance électrochimique Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : The epoxy resin coating has been widely used; however, its anticorrosion performance still needs to be improved. Basalt materials have been used as fillers in the field of anticorrosive coatings due to their good corrosion resistance and acid and alkali resistance. In this paper, 3-aminopropyltrimethoxysilane (APTMS) was used as a coupling agent to modify the surface of basalt powder. The modified basalt powder (MBP) was characterized by scanning electron microscope (SEM) and Fourier transform infrared-attenuated total reflectance (FTIR-ATR). The MBP was added to epoxy resin in different proportions as fillers, and the coatings with different MBP contents were prepared by applying the mixture on the metal substrates. The hardness of coatings can be enhanced up to 0.25 GPa with the increase in MBP, and the elastic of coatings increases to the highest of 4.97 GPa for MBP-10/EP. Their water absorption rates after soaking in water for 21 h decreased to 0.75%. Meanwhile, the anticorrosion performance of the coatings on substrates during exposure to 3.5 wt% NaCl solution was investigated by using electrochemical impedance spectroscopy (EIS), and the circuit-fitting of EIS tests was also performed. The corrosion resistance of EP coating has been obviously improved by adding MBP, with the low-frequency impedance value (|Z|0.01Hz) of MBP-10/EP up to 2.43 × 108 Ω·cm2 after being immersed in 3.5 wt% NaCl solution for 15 d, which was 7.8 times higher than that of neat epoxy coating (MBP-0/EP). Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - Measurement and characterization - RESULTS AND DISCUSSION : Characterization of BP and MBP - Characterization of coatings - Table 1 : Chemical composition analysis of basalt powder - Table 2 : Mechanical properties of MBP/EP coatings - Table 3 : Corrosion voltage and corrosion current density of the coatings immersed in 3.5 wt% NaCl solution for 15 d - Table 4 : Changes of electrochemical fitting parameters of each coating immersed in 3.5 wt% NaCl solution for 15 d DOI : https://doi.org/10.1007/s11998-022-00615-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00615-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38279 [article]

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Synthesis of styrene and n-butyl acrylate latex polymers modified by functional monomers and their waterborne paint applications / Gökhan Akbulut in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1421-1435 Titre : Synthesis of styrene and n-butyl acrylate latex polymers modified by functional monomers and their waterborne paint applications Type de document : texte imprimé Auteurs : Gökhan Akbulut, Auteur ; Hayal Bulbul Sonmez, Auteur Année de publication : 2022 Article en page(s) : p. 1421-1435 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Adhésion Caractérisation Dureté (matériaux) Formulation (Génie chimique) Latex Matériaux -- Propriétés fonctionnelles Métaux -- Revêtements:Métaux -- Peinture Monomères Polyacryliques Polymères -- Synthèse Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.6 Peintures Résumé : Emulsion polymerization acrylic latex polymers (in short latex polymers), crucial ingredients of waterborne paints, provide continuous film formation during the drying stage and act as one of the major factors that determine the performance of paints. Modification of latex polymers is an ongoing process to improve paint performance and it can be accomplished by various methods. In this study, styrene and n-butyl acrylate latex polymers are modified by three functional monomers (methacrylamidoethyl ethylene urea (MAEEU), dimethylaminoethyl methacrylate (DMAEMA), and glycidyl methacrylate (GMA)) alone or combined in different amounts in latex polymer formulations. Impacts of these functional monomers both on latex polymers, and paints made from these latex polymers are investigated. The characterization of the latex polymers are analyzed by differential scanning calorimetry (DSC), minimum film forming temperature (MFFT), dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). Scrub resistance, whiteness, hiding power, glossiness, hardness, contact angle, adhesion on annealed glass and hot-dip galvanized steel surfaces, and color retention properties of the paints are examined. The results are compared with a nonfunctional reference and a commercial styrene-acrylic-based latex polymer, separately. The outcomes confirm that alone and the combinations of these monomers in styrene-acrylic-based latex polymers improve the paint by enhancing scrub resistance, better adhesion on surfaces and the ability to control hydrophobicity and color efficiency. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of latex polymers - Preparation of the paints - Characterization of the Latex Polymers - PAINTS - RESULTS AND DISCUSSION : Characterization of latex polymers and their films - CHARACTERIZATION OF THE PAINTS - Table 1 : Materials for emulsion polymerization and paint preparation - Table 2 : The amounts of functional monomers used in formulations - Table 3 : Variables in latex polymer formulations - Table 4 : Specifications of Acronal 290D - Table 5 : Paint formulation - Table 6 : Characterization results of the reference and latex polymers with one functional monomer - Table 7 : Characterization results of the latex polymers that had at least two functional monomers - Table 8 : Characterization results of the paints - Table 9 : Hardness of the paints - Table 10 : Blister test results of the paints - Table 11 : Adhesion on hot-dip galvanized steel DOI : https://doi.org/10.1007/s11998-022-00616-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00616-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38280 [article]

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Evaluating the effectiveness of self-cleaning products applied on external thermal insulation composite systems (ETICS) / Ana Sofia Silva in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1437-1448 Titre : Evaluating the effectiveness of self-cleaning products applied on external thermal insulation composite systems (ETICS) Type de document : texte imprimé Auteurs : Ana Sofia Silva, Auteur ; Giovanni Borsoi, Auteur ; João Luís Parracha, Auteur ; Inês Flores-Colen, Auteur ; Rosario Veiga, Auteur ; Paulina Faria, Auteur ; Amélia Dionísio, Auteur Année de publication : 2022 Article en page(s) : p. 1437-1448 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Applications extérieures Dioxyde de titane Isolation thermique Nanoparticules Photocatalyse Revêtement auto-nettoyant:Peinture auto-nettoyante Revêtements -- Additifs:Peinture -- Additifs Revêtements protecteurs Tests d'efficacité Index. décimale : 667.9 Revêtements et enduits Résumé : External thermal insulation composite systems (ETICS) have been extensively applied on building façades with the aim of implementing the thermal and aesthetical properties of the building envelope. However, the formation of stains and deposition of particulate matter is often observed in the surface of these systems. The use of multifunctional products with self-cleaning properties can reduce surface anomalies and thus enhance the durability of ETICS. This study aims at evaluating the effectiveness of three protective coatings with self-cleaning additives (i.e., TiO2 nanoparticles), when applied on the surface of ETICS. Three different stains (rhodamine, methylene blue and silver paint aerosol) were applied on the ETICS finishing coat, evaluating the removal of these stains after exposure to natural (solar radiation) light source. The surface properties (compactness, hardness, roughness, gloss, and color) of the ETICS were evaluated prior and after sun exposure. Results showed that the application of the three products lead to a modification of the surface properties (compactness, hardness, gloss, roughness) of the ETICS specimens, and sensibly enhance the self-cleaning, hydrophobic and aesthetical properties of the ETICS. Note de contenu : - MATERIALS AND METHODS : ETICS specimens - Protective coatings - Application protocol - Surface properties - Morphological and microstructural characterization - Self-cleaning test - RESULTS : Surface properties - Morphological and microstructural analysis - Self-cleaning test - Table 1 : Physical features and amount of product used in the application of the protective coatings - Table 2 : Mean values and standard deviations of the ultrasonic propagation speed (Sp), surface hardness, surface gloss, surface roughness, and contact angle (θ) of the untreated (P0) and treated (P1, P2, P3) ETICS specimens DOI : https://doi.org/10.1007/s11998-022-00617-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00617-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38281 [article]

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Superhydrophobic graphene/hydrophobic polymer coating on a microarc oxidized metal surface / Li Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1449-1456 Titre : Superhydrophobic graphene/hydrophobic polymer coating on a microarc oxidized metal surface Type de document : texte imprimé Auteurs : Li Li, Auteur ; Tianlu Li, Auteur ; Zhiyuan Zhang, Auteur ; Zheyu Chen, Auteur ; Chen Chen, Auteur ; Fei Chen, Auteur Année de publication : 2022 Article en page(s) : p. 1449-1456 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Frottements (mécanique) 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. Hydrophobie Polyfluorure de vinylidène Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, by exploiting the lubricity and barrier effect of graphene and the hydrophobic polymer (polyvinylidene fluoride, PVDF), a superhydrophobic graphene/PVDF composite coating (G/PVDF) with contact angle of approximately 153.3° was prepared on microarc oxidized aluminum alloy to protect the substrate from friction and corrosion. The G/PVDF coating was strongly bonded with the microarc oxidization (MAO) layer on the aluminum alloy by the ionic interactions between graphene and the cations of polyelectrolyte, and hydrophobic interactions between graphene and PVDF. Results show that the friction coefficient of the G/PVDF coating was lower than that of the MAO-only ceramic coating, with the lowest friction coefficient for the G/PVDF3 film of about 0.3, which demonstrates better antiwear property compared with the MAO-only ceramic coating. In addition, the superhydrophobic coating exhibited enhanced anticorrosion properties compared with the MAO-only ceramic layer, which is attributed to the combined effect of graphene and the superhydrophobicity of the surface. Note de contenu : - Table 1 : Fitting parameters of EIS plot for MAO and G/PVDF3 after corrosion in 3.5 wt% NaCl solution - Table 2 : The derived Tafel polarization parameters of MAO and G/PVDF3 after being immersed in 3.5 wt% NaCl solution DOI : https://doi.org/10.1007/s11998-022-00618-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00618-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38282 [article]

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Synthesis of hydroxy silane coupling agent and the silane-terminated polyurethane chain-extended by butanediol / Chi Quan-chao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1457-1466 Titre : Synthesis of hydroxy silane coupling agent and the silane-terminated polyurethane chain-extended by butanediol Type de document : texte imprimé Auteurs : Chi Quan-chao, Auteur ; Jian Li, Auteur ; Chen-yi Wang, Auteur ; Qiang Ren, Auteur Année de publication : 2022 Article en page(s) : p. 1457-1466 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Butanediol Caractérisation Composés organiques -- Synthèse Essais dynamiques Hydroxy silane Polymères -- Synthèse Polymères à terminaison silane Polyuréthanes Réaction de couplage Résistance à l'humidité Résistance à la traction Réticulation à l'humidité Revêtements -- Propriétés mécaniques Index. décimale : 667.9 Revêtements et enduits Résumé : A novel hydroxy silane coupling agent (HO-silane) was synthesized via Michael addition reaction between 2-hydroxyethyl acrylate and 3-mercaptopropyl-trimethoxysilane, which was then used to synthesize the silane-terminated polyurethane (SPU). The silane-terminated polyurethanes, which showed low viscosity due to the end-capping by HO-silane, could be chain-extended by butanediol to enhance the performance of SPU in non-solvent condition. The effects of chain extender, 1,4-butanediol, and NCO/OH molar ratio (R value) on the properties of silane-terminated polyurethane were investigated. The results show that the hydroxy silane coupling agent and the silane-terminated polyurethane that can be moisture-cured at ambient temperature were successfully synthesized. It is found that by introducing the 1,4-butanediol segment into SPU main chain, the viscosity of SPU was increased, but the tack free time of SPU was shortened, and the hardness and tensile strength of the moisture-cured SPU film were enhanced. As the R value increased, the tack free time of the silane-terminated polyurethane was prolonged, and the hardness and the tensile strength of the moisture-cured film were increased, but the elongation at break was decreased. When the amount of 1,4-butanediol was 10 wt% and the R value was 1.3, respectively, silane-terminated polyurethane with viscosity of 51,000 mPa·s (80% solid content) can be obtained. The tensile strength of the moisture-cured film was 1.1 MPa, and the elongation at break was 713.4%, which shows great potential for sealant and coating applications. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of hydroxy silane coupling agent (HO-silane) - Synthesis and moisture curing of SPU - Characterization - RESULTS AND DISCUSSION : Synthesis of silane terminated polyurethane (SPU) - Tack free time of SPU - The performance of SPU - The effect of R value on the performance of SPU - Glass transition temperatures of moisture-cured films of SPU DOI : https://doi.org/10.1007/s11998-022-00619-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00619-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38283 [article]

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The preparation of hydrophobic hybrid film coatings from siloxane-modified polyacrylate associated with nano-fumed silica and organo-modified clay / Weepol Pramualkijja in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1467-1492 Titre : The preparation of hydrophobic hybrid film coatings from siloxane-modified polyacrylate associated with nano-fumed silica and organo-modified clay Type de document : texte imprimé Auteurs : Weepol Pramualkijja, Auteur ; Nantana Jiratumnukul, Auteur Année de publication : 2022 Article en page(s) : p. 1467-1492 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Angle de contact Angle de glissement Argile Caractérisation Dispersions et suspensions Hydrophobie Matériaux hybrides Morphologie (matériaux) Polyacrylates Polymères modifiés siloxane Revêtements organiques Rugosité Structure chimique Index. décimale : 667.9 Revêtements et enduits Résumé : Superhydrophobic hybrid film coatings were prepared from the dispersions of siloxane-modified polyacrylate associated with organo-modified clay (OMC-20A) and hydrophobic-fumed silica (FS-H15) coated on glass and cement boards by a dipping process. The hydrophobicity, surface morphology, surface energy, and surface roughness of the obtained hybrid film coatings (HBFCs) were investigated. The results showed that the hydrophobicity of the obtained HBFCs was related to surface roughness and the roughness profile of the surface. HBFCs obtained using 10 phr OMC-20A with 35 phr FS-H15 in hybrid coatings and fabricated by four dipping provided high roughness surfaces (Rq) at 546.67 nm with a micro-nano-binary structure and a low surface energy at 2.35 mN/m leading to superhydrophobic surfaces on the coated glass and cement boards demonstrating 151.34° and 150.88° water contact angles, respectively. As a result, these HBFCs coated on cement board performed great water repellent and self-cleaning. Note de contenu : - Experimental : Materials - Preparation of SMPA - Preparation of the HCs - Fabrication of the HBFCs - Characterization - Results and discussion : SMPA dispersions - Hydrophobicity related with adhesion and hardness - Surface morphology - The chemical structure of HBFCs - Surface energy - Surface roughness and profile of roughness - Effect of porous substrates : The water contact angle, water repellent and self-cleaning - The durability - Table 1 : Recipes of the different HC1s - Table 2 : Recipes of the different HC2s - Table 3 : Adhesion of the HBFCs - Table 4 : The sliding angle of HBFC1 and 2s - Table 5 : The water, EG and glycerol contact angles of the different HCs DOI : https://doi.org/10.1007/s11998-022-00621-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00621-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38284 [article]

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Development of novel gallic acid- and cellulose acetate-coated paper as pH-responsive oxygen indicator for intelligent food packaging / Konala Akhila in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1493-1506 Titre : Development of novel gallic acid- and cellulose acetate-coated paper as pH-responsive oxygen indicator for intelligent food packaging Type de document : texte imprimé Auteurs : Konala Akhila, Auteur ; Dakuri Ramakanth, Auteur ; Kirtiraj K. Gaikwad, Auteur Année de publication : 2022 Article en page(s) : p. 1493-1506 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acétate de cellulose L'acétate de cellulose est une matière plastique inventée en 1865. C'est l'ester acétate de la cellulose. Aliments -- Emballages Caractérisation Chimie -- Essais et réactifs Colorimétrie Enrobage (technologie) Etiquettes Indicateur d'oxygène Matériaux intelligents Oxygène Papier enduit pH Phénoliques, Acides Un acide-phénol (ou acide phénolique) est un composé organique possédant au moins une fonction carboxylique et un hydroxyle phénolique. La pratique courante en phytochimie consiste à réserver ce terme aux dérivés de l’acide benzoïque et de l’acide cinnamique. Les acides hydroxybenzoïques dérivent par hydroxylation de l’acide benzoïque avec une structure de base de type C6-C1. Ces hydroxyles phénoliques OH peuvent ensuite être méthylés. Exemples : l'acide gallique, élément constitutif des tanins hydroxylables et l'acide vanillique dont l'aldéhyde, la vanilline, est bien connue comme l'arôme naturel de vanille. Les dérivés de l'acide cinnamique, les acides hydroxycinnamiques ont une structure de base de type C6-C3. Ils appartiennent à la grande famille des phénylpropanoïdes. Les hydroxyles phénoliques OH de ces dérivés peuvent aussi être méthylés (-O-CH3). Exemples : l'acide paracoumarique, dont les lactones, les coumarines, sont largement distribuées dans tout le règne végétal, l'acide caféique, très large représentation chez les végétaux, souvent sous forme de l'acide chlorogénique (ester avec l'acide quinique), comme dans le grain de café, la pomme ou sous forme d'acide 1,3-dicaféylquinique (cynarine) dans l'artichaut et d'acide rosmarinique dans le romarin et le thé de Java (orthosiphon), l'acide férulique et l'acide sinapique. Dans les plantes, ces acides-phénols sont souvent sous forme d'esters d'alcools aliphatiques ou d'esters de l'acide quinique, de l'acide rosmarinique ou de glycosides. Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Intelligent packaging helps in communicating the quality of packed food with time to assure its safety. A gallic acid monohydrate (GA)-based moisture activated oxygen indicator label was developed to visualize the interaction of food with oxygen. Coating solutions were formulated using cellulose acetate, ethyl acetate/ethanol, and different concentrations of GA. It was bar-coated onto a paper substrate using a layer-by-layer technique and dried at ambient conditions. Upon exposure to varying alkaline pH at atmospheric oxygen, the label exhibited a color change from green to yellow as observed in UV–visible spectra because of a change in the structure of GA. Rheological studies showed GA20% has better viscosity for coating. FESEM and AFM images confirmed its smoother surface with a decrease in roughness by approximately 60%. ΔE values at pH 8 have the highest color difference at all concentrations. Therefore, gallic acid has the potential to be used as an oxygen indicator in food packaging applications. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of the pH-responsive coating - Application of coating - Colorimetric analysis of oxygen indicator labels - Characterization of oxygen indicator labels - RESULTS AND DISCUSSION : FTIR Analysis - Field emission scanning electron microscope - UV–visible spectroscopy and pH analysis - Rheology - Atomic force microscopy - Colorimetry - Oxygen sensitivity and time-dependent analysis - Table 1 : Initial viscosity (ηo) and final viscosity (ηf) of samples corresponding to the shear rates 1 and 100 s− 1, respectively, for different concentrations of cellulose acetate and gallic acid at 27°C - Table 2 : Surface roughness parameters of oxygen indicator labels DOI : https://doi.org/10.1007/s11998-022-00622-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00622-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38285 [article]

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Environment-friendly UV-curable alkyd-based non-isocyanate urethanes / Ilknur Babahan-Bircan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1507-1522 Titre : Environment-friendly UV-curable alkyd-based non-isocyanate urethanes Type de document : texte imprimé Auteurs : Ilknur Babahan-Bircan, Auteur ; Jomin Thomas, Auteur ; Mark D. Soucek, Auteur Année de publication : 2022 Article en page(s) : p. 1507-1522 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Diluants Formulation (Génie chimique) 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. Polyalkydes Revêtements -- Propriétés mécaniques Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Revêtements sans isocyanates Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : Two non-isocyanate polyurethanes (NIPUs) were used as reactive diluents for an alkyd to obtain eco-friendly new UV-curable alkyd-polyurethane coatings. A linseed-based alkyd resin was prepared and formulated with the reactive diluents (NIPUs) and free radical photoinitiator, and then UV-cured. NMRs were used to characterize the alkyd and NIPUs and glass transition temperature (Tg) of cured alkyd-polyurethanes were evaluated by using DSC. Further, spectroscopy and thermal stability of the coatings were evaluated by using ATR-IR spectroscopy and thermogravimetric analysis (TGA), respectively. Moreover, coating properties such as pencil hardness, cross-cut adhesion, pull-off adhesion, impact resistance, and reverse impact resistance were also evaluated. It was found that crosslink density, pencil hardness, adhesion, and Tg were dependent and proportional to the amount of the NIPUs (reactive diluents) showing significant improvement in mechanical and thermal properties compared to the linseed-based alkyd resin. Note de contenu : - EXPERIMENTAL : Material - Instruments - Method - RESULTS : IR results - DSC results - Possible H-bond interaction between the alkyd and the urethane - TGA results - Coating properties - Table 1 : Formulations of alkyd with non-isocyanate urethane dimethacrylate reactive diluents - Table 2 : DSC Results of alkyd-polyurethane - Table 3 : TGA results for alkyd-polyurethane systems (AU1 and AU2 series) - Table 4 : Comparison of gel content of coatings (%) - Table 5 : Coating properties of alkyd-polyurethane systems DOI : https://doi.org/10.1007/s11998-022-00623-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00623-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38286 [article]

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Optimization and application of a low-density epoxy composite coating for autonomous air-to-deep sea vehicles / Michael J. Grzenda in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1523-1534 Titre : Optimization and application of a low-density epoxy composite coating for autonomous air-to-deep sea vehicles Type de document : texte imprimé Auteurs : Michael J. Grzenda, Auteur ; Marco M. Maia, Auteur ; Aristedes Costeas, Auteur ; Paul N. Ferri, Auteur ; Francisco Javier Diez, Auteur ; Jonathan P. Singer, Auteur Année de publication : 2022 Article en page(s) : p. 1523-1534 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Electronique -- Matériaux Epoxydes Matériaux hybrides Revêtements organiques Revêtements protecteurs Sous-marins Thermocinétique Index. décimale : 667.9 Revêtements et enduits Résumé : Unmanned, autonomous air-to-sea vehicles, fully capable of transitioning between the two mediums, have only recently become technologically possible and have attracted great interest due to their numerous applications. However, current vehicles are unable to withstand the environmental conditions of the deep sea, especially with regards to their electronics. Previous methods for protecting electronics in the deep sea are not optimized for transitions to air. Here, a novel, lightweight, thermally-conductive, easily processed, mechanically robust, epoxy-based nanocomposite coating is presented. This material was developed with the intention of bringing the multi-domain air-water drone, known as the Naviator, to the deep ocean. In this work, the coating is thoroughly characterized and demonstrated to protect electronics submerged in water at high-pressure benchtop conditions as well as in an actual deep sea mission. The coating is also contrasted against unmodified epoxy, as well as commercial syntactic foam, and deemed superior for this application. Note de contenu : - EXPERIMENTAL SECTION : Methodology - Materials - Processing - Characterization - Benchtop testing - RESULTS AND DISCUSSION : Material characterization - Material performance - Table 1 : Notable aerial-aquatic vehicles - Table 2 : All tests performed on the same nanocomposite ESC board in order DOI : https://doi.org/10.1007/s11998-022-00627-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00627-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38287 [article]

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Ability of metallic nano-particles to provide UV protection to wood surface : a preliminary experiment / Tengfei Yi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1535-550 Titre : Ability of metallic nano-particles to provide UV protection to wood surface : a preliminary experiment Type de document : texte imprimé Auteurs : Tengfei Yi, Auteur ; Jeffrey J. Morrell, Auteur Année de publication : 2022 Article en page(s) : p. 1535-550 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alumine Bois -- Revêtements protecteurs Caractérisation Colorimétrie Dioxyde de silicium Dioxyde de titane Evaluation Fourier, Spectroscopie infrarouge à transformée de Mouillabilité Nanoparticules Oxyde de fer Oxyde de zinc Pins et constituants Protection contre le rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : The effects of various nano-particle types and sizes on color, wettability, and surface chemistry of radiata pine (Pinus radiata) sapwood samples were investigated over 6 weeks of outdoor exposure. Specimens were treated with 0.2% wt/wt water dispersions of zinc oxide (ZnO), titanium dioxide (TiO2), aluminum oxide (Al2O3), silica dioxide (SiO2), cerium dioxide (CeO2), and iron oxide (Fe2O3), and four nano-sizes of Fe2O3. Color changes during exposure were characterized by measuring CIE L*a*b* color parameters, surface wettability changes were assessed using water droplet contact angle, and chemical changes were characterized by Fourier transform infrared spectroscopy (FTIR). Nano-particles protected wood from photo-discoloration to differing degrees with iron oxide providing the most effective and consistent protection. Smaller alpha Fe2O3 nano-particles provided better UV protection. Nano-particles did not reduce wettability of wood after UV exposure nor were they able to completely prevent lignin degradation. Zinc oxide nano-particles provided some cellulose and hemicellulose protection during UV exposure. Iron oxide nano-particles exhibited some potential for limiting degradation, but the differences were small and not significant from untreated controls. The results suggest that combinations of zinc and iron oxide might be useful for UV protection, and further trials are planned with these mixtures. Note de contenu : - MATERIALS AND METHODS : Materials - Characterization of nano-particles - Preparation of nano-particle solutions and treatment of wood surfaces - Exterior exposure - Color measurements - Wettability assessment - Fourier transform infrared spectroscopy (FTIR) - RESULTS AND DISCUSSION : Nano-particle size analysis - Color changes - Surface wettability changes - FTIR spectroscopic analysis - Table 1 : Reported and actual dimensions of nano-particles used in this study - Table 2 : Average solution uptakes of water alone or with 0.2% wt/wt of selected nano-particles - Table 3 : Climate conditions at the test site over the 6-week field exposure - Table 4 : Assignments of infrared bands to molecular bonds in wood - Table 5 : Ratios of selected peaks on the FTIR spectra with the peak at 1057 cm−1 for non-coated radiata pine wood samples before and after 6 weeks of outdoor exposure - Table 6 : Comparisons between ratios of peak heights at 3343 or 2921/2899 cm−1 with those at 1057 cm−1 for radiata pine sapwood treated with selected nano-particles and exposed outdoors for 6 weeks - Table 7 : Comparisons between peak heights of selected peaks with the peak at 1057 cm−1 for radiata pine sapwood treated with selected nano-particles and exposed outdoors for 6 weeks DOI : https://doi.org/10.1007/s11998-022-00628-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00628-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38288 [article]

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Slow-release fertilizers based on lignin–sodium alginate biopolymeric blend for sustained N–P nutrients release / Fatima-Zahra El Bouchtaoui in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1551-1565 Titre : Slow-release fertilizers based on lignin–sodium alginate biopolymeric blend for sustained N–P nutrients release Type de document : texte imprimé Auteurs : Fatima-Zahra El Bouchtaoui, Auteur ; El-Houssaine Ablouh, Auteur ; Ihsane Kassem, Auteur ; Zineb Kassab, Auteur ; Houssine Sehaqui, Auteur ; Mounir El Achaby, Auteur Année de publication : 2022 Article en page(s) : p. 1551-1565 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alginate de sodium L'alginate de sodium ou polymannuronate sodique, de formule NaC6H7O6 est un additif alimentaire (E401) utilisé dans les boissons, constitué d’alginate et de sodium. Il se présente sous forme de poudre blanche à blanc crème, inodore et sans saveur, très soluble dans l'eau. C'est une longue molécule extraite d'algues brunes, constituée d'unités de glucides reliées ensemble pour former une chaîne. Biopolymères Caractérisation Engrais organiques Enrobage (technologie) Fluidisation Formulation (Génie chimique) Lignine La lignine est un des principaux composants du bois, avec la cellulose, l'hémicellulose et des matières extractibles. La lignine est présente principalement dans les plantes vasculaires et dans quelques algues. Ses principales fonctions sont d'apporter de la rigidité, une imperméabilité à l'eau et une grande résistance à la décomposition. Toutes les plantes vasculaires, ligneuses et herbacées, fabriquent de la lignine. Quantitativement, la teneur en lignine est de 3 à 5 % dans les feuilles, 5 à 20 % dans les tiges herbacées, 15 à 35 % dans les tiges ligneuses. Elle est moindre pour les plantes annuelles que pour les vivaces, elle est maximum chez les arbres. La lignine est principalement localisée entre les cellules (voir parois pectocellulosiques), mais on en trouve une quantité significative à l'intérieur même de celles-ci. Bien que la lignine soit un réseau tridimensionnel hydrophobe complexe, l'unité de base se résume essentiellement à une unité de phénylpropane. La lignine est le deuxième biopolymère renouvelable le plus abondant sur la Terre, après la cellulose, et, à elles deux, elles cumulent plus de 70 % de la biomasse totale. C'est pourquoi elle fait l'objet de recherches en vue de valorisations autres que ses utilisations actuelles en bois d'Å“uvre et en combustible. Voie de biosynthèse : La lignine est une molécule dont le précurseur est la phénylalanine. Cet acide aminé va subir une cascade de réactions faisant intervenir une dizaine de familles d'enzymes différentes afin de former des monolignols. Ces enzymes sont : phénylalanine ammonia-lyase (PAL), cinnamate 4-hydroxylase (C4H), 4-coumarate:CoA ligase (4CL), hydroxycinnamoyl-CoA shikimate/quinate hydroxycinnamoyl transferase (HCT), p-coumarate 3-hydroxylase (C3H), caffeoyl-CoA o-methyltransferase (CCoAOMT), cinnamoyl-CoA reductase (CCR), ferrulate 5-hydroxylase (F5H), caffeic acid O-methyltransferase (COMT) et cinnamyl alcohol deshydrogenase (CAD). Dans un certain nombre de cas, des aldéhydes peuvent également être incorporés dans le polymère. Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, biodegradable sodium alginate–lignin (SA-L) blend formulations at different SA/L ratios were developed as low-cost coating material for highly efficient slow-release di-ammonium phosphate (DAP) fertilizer. The structural and chemical properties of different coating formulations were investigated via FTIR spectroscopy, and the slow-release capability of coated fertilizers was determined in water, as well as in soil. Moreover, their impact on the water-holding and retention capacities of soil was also examined. Experimental results indicated that the application of developed coatings corrected the fertilizer surface irregularities by forming a uniform and compact polymeric film. Further, they significantly enhanced its mechanical properties and extended the maximum nutrients availability toward longer periods. It was also found that increasing the lignin content favorably affected the slow-release behavior, exceeding one month before the nutrients complete release in soil, instead of only four days obtained using uncoated DAP. Findings from this work indicated that SA-L blend coating material could interestingly serve in producing new eco-friendly slow-release DAP fertilizer with improved physical quality and nutrients use efficiency. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of SA-L coating formulations - Preparation of coated DAP fertilizers - Characterization methods - RESULTS AND DISCUSSION : SA-L formulation characteristics - Morphological and mechanical properties of SA-L-c-DAP fertilizers - Slow-release behavior in water - Effect of SRFs on water-holding and water-retention capacities of soil - Nutrients release in soil - Table 1 : Weight fraction (%) and nomenclature used to identify all SA-L formulations - Table 2 : Physicochemical properties of soil used in this work DOI : https://doi.org/10.1007/s11998-022-00629-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00629-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38289 [article]

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Development of an image-based measurement instrument for gloss characterization / Stijn Beuckels in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1567-1582 Titre : Development of an image-based measurement instrument for gloss characterization Type de document : texte imprimé Auteurs : Stijn Beuckels, Auteur ; Jan Audenaert, Auteur ; Peter Hanselaer, Auteur ; Frédéric Bernard Leloup, Auteur Année de publication : 2022 Article en page(s) : p. 1567-1582 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique) Caractérisation Mesure -- Instruments Index. décimale : 667.9 Revêtements et enduits Résumé : Gloss is one of the main attributes to describe the appearance of surfaces and objects, as it contributes to the general quality perception. Gloss is a multidimensional quantity of which ‘specular gloss’ is the most commonly applied attribute. Specular gloss meters are standardized and widely used in industry. However, their readings correlate only partially to the general visual gloss impression, which also comprises distinctness-of-the-reflected-image (DOI), haze, contrast and surface-uniformity attributes. This study presents a more profound image-based gloss meter (iGM) which incorporates a CMOS camera detector. This concept is not new, but limited research has been conducted on the inclusion of various image processing evaluations for gloss attributes. The designed iGM is compatible to 60° specular gloss meter standards. The CMOS detector captures the reflected source image, which is processed to measure four perceptual attributes of surface gloss. The obtained results validate the 60° specular gloss evaluation and indicate a promising capability in characterizing DOI, haze, and contrast. Contrast is an important attribute that is not available yet in industrial gloss meters. It is measured using a diffuse aspecular light source. Generally, this iGM maintains the hardware principles of specular gloss meters, while evolving toward a representative gloss perception meter. Note de contenu : - Design of the iGM : Optical design - Spectral characteristics - Mechanical design - Characterization of the iGM - Results : Test samples - Specular gloss - Distinctness-of-image (DOI) - Haze - Contrast - Table 1 : A summary of available measurement metrics is given for the selected perceptual attributes of surface gloss - Table 2 : Comparison of the gloss values, for the first two samples sets, obtained with the iGM, the Rhopoint IQ (GM1) and the BYK-Gardner micro-TRI gloss meter (GM2) - Table 3 : Measurements results for DOI and haze (see below section) metrics on the Alanod 1100G sample are presented for the IQ and the iGM DOI : https://doi.org/10.1007/s11998-022-00629-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00629-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38290 [article]

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The use of poly(styrene-co-chloromethyl styrene) in the modification of triglyceride oils / Tugba Hayri-Senel in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1583-1593 Titre : The use of poly(styrene-co-chloromethyl styrene) in the modification of triglyceride oils Type de document : texte imprimé Auteurs : Tugba Hayri-Senel, Auteur ; Pelin Yazgan-Birgi, Auteur ; Fatih Bildik, Auteur ; A. Tuncer Erciyes, Auteur Année de publication : 2022 Article en page(s) : p. 1583-1593 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Huiles et graisses Liants -- Synthèse Polyaddition Polymères -- Synthèse Polystyrène-co-chlorométhylstyrène Revêtements -- Additifs Revêtements organiques Triglycérides Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, Poly(styrene-co-chloromethyl styrene) [Poly(St-co-CMS)] was prepared and used in the modification of triglyceride oils. The obtained modified triglyceride product was examined in view of oil-based binder. Nitroxide-mediated radical polymerization (NMRP) technique was applied for Poly(St-co-CMS) synthesis. Chloro groups on the Poly(St-co-CMS) backbone were reacted with 2-amino-1-butanol (2-AB) in order to obtain a polymer with hydroxyl ended side branches, [Poly(St—OH)], which were further combined with partial glycerides (PGs) through the reaction with toluene diisocyanate (TDI). The resulting product can also be considered as a polystyrene-modified urethane oil [Poly(St-OH)-SUO]. The structures of both intermediates, [Poly(St-co-CMS), Poly(St—OH)], and final products [Poly(St-OH)-SUO] were verified by using FTIR and 1H-NMR analyses. Additionally, thermal properties of the samples were determined. The film properties of Poly(St-OH)-SUO samples prepared with different polymer/oil ratios and classic urethane oil were examined. Poly(St-OH)-SUO-40 sample exhibited the best film properties among the others. In the end, the obtained results showed that Poly(St-OH)-SUO-40 could be utilized as an oil-based binder. Note de contenu : - Materials - Characterization - Synthesis of poly(St-co-CMS) - Synthesis of poly(St-OH) - Synthesis of partial glyceride mixture from sunflower oil - Preparation of classical urethane oil - Preparation of polystyrene-modified urethane oil [poly(St-OH)-SUO] - Determination of film properties - Table 1 : The polymerization conditions and properties of the Poly(St-co-CMS) sample (Temperature: 135 °C, 8 h) - Table 2 : Ratios of the materials used in all trials - Table 3 : The comparison of the film properties - Table 4 : Comparison of alkali resistances of varies oil-based binder samples 30,31,33,34,35,36,37,38,39,40,41,42 taken from the literature with the Poly(St-OH)-SUO-40 DOI : https://doi.org/10.1007/s11998-022-00631-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00631-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38291 [article]

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Microwave-assisted polyol synthesis of V–ZrSiO4 nanoparticles and its use as a blue ceramic pigment / Hossein Heydari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1595-1607 Titre : Microwave-assisted polyol synthesis of V–ZrSiO4 nanoparticles and its use as a blue ceramic pigment Type de document : texte imprimé Auteurs : Hossein Heydari, Auteur ; Mardali Yousefpour, Auteur ; Esmaeil Emadoddin, Auteur ; Maryam Hosseini Zori, Auteur ; Mohsen Khajeh Aminian, Auteur Année de publication : 2022 Article en page(s) : p. 1595-1607 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bleu (couleur) Caractérisation Colorimétrie Dispersions et suspensions Matériaux céramiques Micro-ondes Pigments inorganiques Polymères -- Synthèse Polyols Zircon Le zircon est un minéral du groupe des silicates, sous-groupe des nésosilicates. De composition ZrSiO4, c'est un silicate de zirconium naturel. Ses cristaux font partie des pierres fines de la joaillerie. Le mot zircon proviendrait, soit de l'arabe zarqun (cinabre), soit du persan zargun (doré). On retrouve cette étymologie dans l'anglais jargoon, qui désigne des zircons de couleur claire. Les zircons jaunes à grenat sont appelés hyacinthes (du grec signifiant "jacinthe"). Les spécimens transparents sont utilisés en joaillerie pour des utilisations similaires à celles du diamant. Le terme de zircon est parfois utilisé à tort pour désigner la zircone, l'oxyde de zirconium de composition ZrO2. La zircone à l'état naturel (minéral baddeleyite (en)) est extraite industriellement pour servir de substitut peu onéreux au diamant. (Wikipedia) Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, a microwave-assisted polyol technique was used to synthesize vanadium-containing nanopigments of ZrSiO4. The influence of microwave power (300–900 W) and irradiation time (60–120 s) on the purity, crystallinity, and particle size of the synthesized nanoparticles was studied. The resulting powder (synthesized and calcined) was investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). XRD analysis shows that the 300 W synthesized powder is composed of solid amorphous particles. The microwave power was increased to 900 W to convert all particles to crystalline nano-ZrSiO4. The experiment revealed the critical influence of irradiation time and microwave power on purity and crystallinity. The microwave effect can accelerate the reaction and the nucleation rate of ZrSiO4 at a lower reaction temperature. The nanoparticles obtained were tested as ceramic pigments, and the colorimetric parameters of CIELab were measured. Structure and colorimetric studies have confirmed that a fully crystalline zircon phase can be obtained at 1100°C and can be used as a blue pigment. Note de contenu : - EXPERIMENTAL PROCEDURE : Precursor and reagents - Preparation of suspensions - Techniques of characterization - RESULTS AND DISCUSSION : Synthesis and characterization of suspensions - Effect of microwave power and irradiation time on crystallinity - Microstructure investigation - Colorimetric results - Table 1 : Sample preparation conditions for different microwave power and irradiation time in EG solvent - Table 2 : CIELab values of the glazes provided by pigments calcined at 1100°C DOI : https://doi.org/10.1007/s11998-022-00632-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00632-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38292 [article]

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Flame retardant finishing of cotton fabric based on ionic liquid compounds containing boron prepared with the sol-gel method / Mohamed El Messoudi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1609-1619 Titre : Flame retardant finishing of cotton fabric based on ionic liquid compounds containing boron prepared with the sol-gel method Type de document : texte imprimé Auteurs : Mohamed El Messoudi, Auteur ; Aicha Boukhriss, Auteur ; Aziz Bentis, Auteur ; Mehdi El Bouchti, Auteur ; Mohamed Ait Chaoui, Auteur ; M'hammed El Kouali, Auteur ; Said Gmouh, Auteur Année de publication : 2022 Article en page(s) : p. 1609-1619 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bore 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). Essais (technologie) Essais de comportement au feu Essais dynamiques Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Liquides ioniques Sol-gel, Procédé Textiles et tissus -- Finition Résumé : Cotton (CO) fabrics with flame retardant properties based on ionic liquids: 1-methyl-3-(-((triethoxysilyl)oxy)propyl)-1H-imidazol-3-ium chloride (MCPTS) and 1-(3-(triethoxysilyl)propyl)pyridine-1-ium chloride (PCPTS) with boron from boric acid are successfully obtained via a sol-gel process. Fourier transform infrared spectroscopy (FTIR), optical microscopy analysis, and scanning electron microscopy (SEM) images, were first carried out to characterize the chemical composition and the morphology of the treated and untreated cotton fabrics, respectively. The investigation of flame resistance was evaluated by the vertical burning test. It was observed that the treated cotton fabrics exhibited good flame-retardant properties and did not burn even after 10 s flame application duration and the rate of flame spread was inhibited compared to the pristine cotton fabric. Furthermore, the thermal comportment of cotton fabrics was analyzed by thermogravimetric (TG) analysis and differential scanning calorimeter (DSC). Moreover, the tensile strength of the treated textiles is mostly reserved. In this work, we prove that the sol-gel method using ionic liquids and boron could be used as an effective flame retardant to develop finishing cotton fabrics for textile fireproof applications. Note de contenu : - EXPERIMENTAL : Material - Synthesis of MCPTS and PCPTS salts - Sols synthesis based on MCPTS doped boron - Treatment of cotton fabric - FTIR analysis - Morphological analysis - Vertical flame test - Thermogravimetric analysis - Differential scanning calorimeter (DSC) - Mechanical properties measurements - The washing test - RESULTS AND DISCUSSION : FTIR analysis - Morphological analysis - Vertical flame test - Thermogravimetric analysis - Differential scanning calorimeter (DSC) - Mechanical properties measurements - The washing test - Table 1 : Samples and their structural design - Table 2 : Results of vertical flammability test of untreated CF and TCF samples - Table 3 : Thermogravimetric data of untreated and treated CO in air atmosphere - Table 4 : Data of untreated and treated CO DOI : https://doi.org/10.1007/s11998-022-00633-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00633-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38293 [article]

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Synthesis and property of room-temperature self-healable cathodic electrophoretic deposition coatings based on cationic waterborne polyurethane / Yingyu Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1621-1633 Titre : Synthesis and property of room-temperature self-healable cathodic electrophoretic deposition coatings based on cationic waterborne polyurethane Type de document : texte imprimé Auteurs : Yingyu Li, Auteur ; Jingwei He, Auteur ; Hongfeng Luo, Auteur ; Xiaoling He, Auteur ; Fang Liu, Auteur Année de publication : 2022 Article en page(s) : p. 1621-1633 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dépôt électrophorétique Polymères -- Synthèse Polymères en émulsion Polyuréthanes Revêtement autoréparant Revêtements -- Propriétés thermiques Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Cathodic electrophoretic deposition (CED) coatings are inevitably scratched following their application in processes such as automotive finishing. Self-healing coatings possess the ability to repair micro-scale damage, thereby extending their service life and reducing maintenance costs. Here, a novel strategy was developed to synthesize room-temperature intrinsic self-healing CED coatings by inserting 2-aminophenyl disulfide (APDS) into the polymer chain of cationic waterborne polyurethane (CWPU). Emulsion films incorporating the disulfide (SCWPU) could self-heal at room temperature via dynamic disulfide bond exchange and hydrogen bonding interactions, and their structures were confirmed by FTIR and Raman spectroscopy. The thermal properties of the SCWPU films were determined by differential scanning calorimetry and thermal gravimetric analysis. The effects of APDS incorporation and hard segment content (HSC) on the self-healing ability, mechanical and emulsion properties of the SCWPU films were systematically investigated. The results showed that the self-healing abilities of SCWPU film were 97.2% at RT over 24 h and 96.5% at 37°C (body temperature) after 4 h. CED coatings (8 μm, 3H pencil hardness) prepared from SCWPU emulsion also displayed self-healing properties at room temperature. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of cationic waterborne polyurethanes with disulfide bond (SCWPU) - Preparation of SCWPU films - Characterization of SCWPU - Self-healing performance - Preparation of films of cathodic electrodeposition (CED) coatings - RESULTS AND DISCUSSION : FTIR and Raman spectra analysis - Thermal properties - Self-healing properties - Properties of the waterborne CED coatings - Table 1 : Composition of Sxa-CWPU samples (mol ratio) - Table 2 : Composition of SCWPU/HSCa samples (mol ratio) - Table 3 : Properties of the CED film coatings and SCWPU emulsions DOI : https://doi.org/10.1007/s11998-022-00634-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00634-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38294 [article]

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