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Diffusion cell investigations into the acidic degradation of organic coatings / Victor Buhl Møller in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - 1201-1215 Titre : Diffusion cell investigations into the acidic degradation of organic coatings Type de document : texte imprimé Auteurs : Victor Buhl Møller, Auteur ; Ting Wang, Auteur ; Kim Dam-Johansen, Auteur ; Sarah Maria Frankaer, Auteur ; Søren Kiil, Auteur Année de publication : 2018 Article en page(s) : 1201-1215 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acidité Coefficient de diffusion Un coefficient de diffusion est une grandeur caractéristique du phénomène de diffusion de la matière. Le coefficient de diffusion mesure le rapport entre le flux molaire dû à la diffusion moléculaire, et le gradient de concentration de l'espèce chimique considérée (ou, plus généralement, de la variable d'effort entraînant cette diffusion), comme formulé par la loi de Fick. Copolymère vinyle ester Matériaux -- Propriétés barrières Modèles mathématiques Perméation Polyuréthanes Revêtements organiques Revêtements protecteurs -- Détérioration Index. décimale : 667.9 Revêtements et enduits Résumé : Protective organic coatings work by preventing contact between an aggressive environment and a vulnerable substrate. However, the long required lifetime of a barrier coating provides a challenge when attempting to evaluate coating performance. Diffusion cells can be used as a tool to estimate coating barrier properties and lifetime. In this work, a diffusion cell array was designed, constructed, and compared to previous designs, with simplicity being the most important design parameter. Sulfuric acid diffusion through five different coatings was monitored using a battery of cells, and a mathematical model was developed to simulate the experimental data and to study diffusion mechanisms. The diffusion cells allowed an objective and fast analysis of coating barrier properties. It was found that sulfuric acid deteriorated these properties as it diffused through the films. This was also expressed in the modeling results, where a three-step time dependency of the diffusion coefficient was required to simulate both acid breakthrough time and the subsequent steady-state flux. A vinyl ester-based coating proved to be the most effective barrier to sulfuric acid diffusion, followed by a polyurethane coating. Amine-cured novolac epoxies provided the least effective protection. Note de contenu : - PREVIOUS DIFFUSION CELL DESIGN - NEW DIFFUSION CELL DESIGN - DIFFUSION CELL DETAILS - EXPERIMENTAL CONDITIONS - EXPERIMENTAL PROCEDURE - COATINGS INVESTIGATED - MATHEMATICAL MODELING : Mass balance - Estimation of model parameters - EXPERIMENTAL RESULTS : Preliminary conditions - Harsh conditions - MATHEMATICAL MODELING OF DIFFUSION DATA : Using constant diffusion coefficients - Using concentration and time-dependent diffusion coefficients - DISCUSSION : Coating barrier properties - Coating performance and lifetime estimation - Coating degradation and diffusion mechanisms - Water saturation effects - Combined cell mechanism - VALIDATION OF MODEL ASSUMPTIONS DOI : 10.1007/s11998-018-0094-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0094-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31331 [article]

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Preparation and characterization of waterborne polyurethane/polyacrylate emulsions containing sulfonate groups / Xiaorong Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1217-1227 Titre : Preparation and characterization of waterborne polyurethane/polyacrylate emulsions containing sulfonate groups Type de document : texte imprimé Auteurs : Xiaorong Wang, Auteur ; Guoyan Ma, Auteur ; Minyan Zheng, Auteur Année de publication : 2018 Article en page(s) : p. 1217-1227 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Emulsifiants Energie de surface Groupement carboxyle Groupement sulfonate Haut extrait sec Polyacrylates Polymères en émulsion Polyuréthanes Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Polyurethane/polyacrylate emulsions (SDPUA) with high solid content were obtained by using carboxyl groups and sulfonate groups as hydrophilic chain-extenders and internal emulsifiers through surfactant-free emulsion polymerization. Polyurethane/polyacrylate emulsions with ethylene diamine (EDA) as chain-extender (EDPUA) were also prepared. The influence of the different 2,4-diamino-benzenesulfonic acid sodium salt (DABS) content on the properties of the SDPUA products was investigated. The main properties of EDPUA were also discussed compared with the SDPUA samples. Dynamic light scattering results showed that when DABS/DMPA molar ratios increased from 1/4.7 to 1/2.28, the particle size increased from 72.2 to 99.7 nm. The particle size of EDPUA emulsion was larger. The steady rheological measurements illustrated that the viscosity decreased with the shear rate increase and the emulsions were displayed as pseudoplastic behavior. Attenuated total reflection Fourier transform infrared results demonstrated the SDPUA products were successfully prepared. As the function of DABS groups, the thermal stability was enhanced. With the increment in DABS/DMPA molar ratio, the contact angles on SDPUA membranes decreased, and the surface free energies increased. The T-peel strength increased to 88.2 N/mm and DABS/DMPA molar ratio increased to 1/2.28, and it was larger than the EDPUA samples. The compatibility of the dual phases was enhanced. Note de contenu : - EXPERIMENTAL : Materials - Preparation of SDPUA composite emulsions - Characterization - RESULTS AND DISCUSSION : Effect of DABS/DMPA molar ratios on the properties of SDPUA samples - Effect of EDA content on the properties of EDPUA samples DOI : 10.1007/s11998-018-0062-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0062-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31332 [article]

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Preparation of an ionic/nonionic polyurethane-silicone dispersion (PUSD) with a high solid content and low viscosity using complex soft segments / Xiaoli Wei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1229-1237 Titre : Preparation of an ionic/nonionic polyurethane-silicone dispersion (PUSD) with a high solid content and low viscosity using complex soft segments Type de document : texte imprimé Auteurs : Xiaoli Wei, Auteur ; Faxing Zhang, Auteur Année de publication : 2018 Article en page(s) : p. 1229-1237 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère silicone-uréthane Dispersions et suspensions Dispersions et suspensions -- Stabilité Haut extrait sec Hydrophobie Particules -- Morphologie Résistance aux conditions climatiques Revêtements en phase aqueuse Rhéologie Taille des particules Index. décimale : 667.9 Revêtements et enduits Résumé : A series of ionic/nonionic polyurethane-silicone dispersions (PUSDs) with a high solid content and low viscosity were prepared using isophorone diisocyanate as the hard segment, polytetrahydrofuran polyether diol (PTMG) and polysiloxane diol (PESI) as the complex soft segments and an ionic/nonionic low molecular weight polyether diol (DPSA) as the hydrophilic, chain-extending agent. The morphologies and rheological properties of the ionic/nonionic PUSD were examined using particle-size, TEM, and viscosity analyses. The hydrophobic and mechanical properties of the dispersions were also tested. It was found that under the conditions of a constant NCO/OH ratio (2/1) and weight percentage of DPDA (6%), the PUSD dispersions with higher PESI contents possessed higher average particle diameters and wider particle-size distributions. Particles in the PUSD dispersions are generally spherical and have a typical core–shell structure due to the use of complex soft segments. However, the solid content of the ionic/nonionic PUSD increased first and then decreased as the weight ratio of PESI to PTMG increased. When the ratio ranged from 4/10 to 6/10, the max solid content of the ionic/nonionic PUSD reached up to 58%, but the viscosity of the PUSD was less than 400 mPa.s−1. Meanwhile, the water contact angle of the films increased due to the formation of a crosslinking structure on the side of the PUSD macromolecule, and when the weight ratio of PESI to PTMG varied from 3/10 to 7/10, the water contact angle of the films increased from 48.3° to 72.3°. In addition, both the freeze-thaw and thermal stabilities of the PUSD dispersions were enhanced as the weight ratio of PESI to PTMG increased. The PUSD coating had good mechanical properties as well. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of the polyurethane-silicone dispersions (PUSDs) - Characterization - RESULTS AND DISCUSSION : Average particle diameter and distribution of the dispersions - Particle morphology of the dispersions - Rheology of the dispersions - The stability of the dispersions - The hydrophobic properties of the PUSD films - The mechanical properties of the PUSD coating DOI : 10.1007/s11998-018-0063-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0063-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31333 [article]

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Development of direct contact-killing non-leaching antimicrobial polyurethanes through click chemistry / Kaimei Peng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1239-1250 Titre : Development of direct contact-killing non-leaching antimicrobial polyurethanes through click chemistry Type de document : texte imprimé Auteurs : Kaimei Peng, Auteur ; Xuexin Dai, Auteur ; Haili Mao, Auteur ; Hongtao Zou, Auteur ; Zaibo Yang, Auteur ; Weiping Tu, Auteur ; Jianqing Hu, Auteur Année de publication : 2018 Article en page(s) : p. 1239-1250 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Benzisothiazolinone La benzisothiazolinone est un biocide très répandu faisant partie du groupe d´isothiazolinone. Utilisé comme agent conservateur dans la peinture, le vernis et l´adhésif, il a un effet fongicide. Caractérisation Chimie click Composés organiques -- Synthèse Polyuréthanes Résistance à l'humidité:Résistance à l'eau Revêtements -- Propriétés thermiques Index. décimale : 667.9 Revêtements et enduits Résumé : A robust, efficient, and orthogonal click chemistry (copper (I)-catalyzed alkyne-azide cycloaddition) was used to prepare an antimicrobial polymer and precisely control the conjugation ratio of antibiotic molecules to polymer. Antimicrobial polyurethanes with pendant benzisothiazolinone (PU-BIT) were synthesized using click chemistry to connect azide functional polyurethane (PU-N3) and alkyne functional benzisothiazolinone (BIT-Al). The direct contact-killing and non-leaching antimicrobial properties of PU-BIT were verified by both antimicrobial drop and disk diffusion. This approach provides a new methodology and platform for the development of contact-killing and non-leaching antimicrobial materials for a variety of practical applications. This research is the first to demonstrate that the broad-spectrum BIT antibiotic is a selective antibiotic for Gram-positive bacteria when covalently linked to a polymer. PU-BIT film containing 0.8 wt% BIT exhibited a selective antimicrobial performance with bactericidal efficacy of 91.6% and 30% against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli, respectively. The mechanism of the selective antimicrobial activity of PU-BIT is also discussed. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis - Characterization - RESULTS AND DISCUSSION : Monomers and polymers synthesis - Thermal properties - Water-resistance property - Antimicrobial activity DOI : 10.1007/s11998-018-0068-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0068-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31334 [article]

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Oligosilazane cured by moisture as fluorine-free hydrophobic coating for waterproof polymer-matrix composite materials / Mingcun Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1251-1258 Titre : Oligosilazane cured by moisture as fluorine-free hydrophobic coating for waterproof polymer-matrix composite materials Type de document : texte imprimé Auteurs : Mingcun Wang, Auteur ; Yi Ning, Auteur ; Weijian Han, Auteur ; Tong Zhao, Auteur Année de publication : 2018 Article en page(s) : p. 1251-1258 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à matrice organique Imperméabilisation Oligosilazane Réticulation à l'humidité Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Preceramic oligosilazane was applied as a waterproof hydrophobic surface coating for electromagnetic wave-transmitting material (silica cloth-reinforced bismaleimide laminated composite). Oligosilazane spread readily on the surface of the material, due to its good wetting ability, enabling formation of silazane coatings using various processing methods such as spraying, dipping, wiping, etc. When using oligosilazane containing micrometer-sized silica particles as filler, a hydrophobic surface was realized after moisture curing under ambient condition. The hydrophobic surface with oligosilazane coating inhibited water absorption shows promise for application as a waterproof surface coating of electromagnetic wave-transmitting materials. Note de contenu : - EXPERIMENTAL : Processing of oligosilazane coating and curing by atmospheric moisture - Processing of oligosilazane-silica slurry coating and curing by atmospheric moisture - Characterization - RESULTS AND DISCUSSION : Processing of oligosilazane coating and curing by ambient moisture - Hydrophobicity and microscopic morphology of cured coatings - Inhibition of water absorption by oligosilazane coating on advanced composite materials DOI : 10.1007/s11998-018-0092-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0092-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31335 [article]

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Impedance sensor for the early failure diagnosis of organic coatings / Guangyi Cai in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1259-1272 Titre : Impedance sensor for the early failure diagnosis of organic coatings Type de document : texte imprimé Auteurs : Guangyi Cai, Auteur ; Haowei Wang, Auteur ; Dan Jiang ; Zehua Dong Année de publication : 2018 Article en page(s) : p. 1259-1272 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Capteurs (technologie) Caractérisation Essais de brouillard salin Morphologie (matériaux) Revêtements -- Détérioration Revêtements organiques Spectroscopie d'impédance électrochimique Surfaces -- Analyse Index. décimale : 667.9 Revêtements et enduits Résumé : A miniature impedance sensor used for field diagnosis of the early failure of coatings has been developed based on microelectronics and electrochemical impedance spectroscopy (EIS). The aging process of polyurethane-based coatings in salt spray test chamber was studied using the impedance sensor. Several critical indexes related to EIS such as phase angle (θ10Hz, θ15kHz), breakpoint frequency (fb), specific capacitance (C10Hz, C15kHz), and impedance modulus (Z0.1Hz) were proposed to evaluate the severity of coating degradation. The results indicated that the impedance sensor could accurately monitor the degradation process of coatings, and once Z0.1Hz < 106 Ω cm2, fb > 100 Hz, or θ10Hz < 20°, the coating may be regarded as completely degraded and fails to protect the metal substrate. Note de contenu : - EXPERIMENTAL : Coating sensor - Sample preparation - Salt spray test - EIS measurement - Surface characterization - RESULTS AND DISCUSSION : EIS of coated sensors and specimens - Morphology analysis - EIS parameters of coating degradation DOI : 10.1007/s11998-018-0072-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0072-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31338 [article]

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Photooxidative stability provided by condensed tannin additives in acrylic-based surface coatings on exterior exposure in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1273-1282 Titre : Photooxidative stability provided by condensed tannin additives in acrylic-based surface coatings on exterior exposure Type de document : texte imprimé Année de publication : 2018 Article en page(s) : p. 1273-1282 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Applications extérieures Copolymère styrène acrylique Matériaux -- Propriétés fonctionnelles Revêtements -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Condensed tannins, also known as proanthocyanidins, have been added as functional additives to acrylic-based clear coatings to promote polymer coating longevity and also stabilize timber color on accelerated and exterior weathering. When added at < 0.5% w/w content, native tannins and tannins modified with maleate groups extended coating performance > 20% compared to commercial hindered amine light stabilizers (HALS) and phenolic stabilizers used at comparable coating loadings. Other tannin chemical modifications such as methylcarboxylate groups were also associated with greater coating longevity beyond that achieved with the synthetic UV and antioxidant additives. This study has also revealed that tannin addition to acrylic coatings can act to photostabilize timber coloring on exterior exposure. While tannin use can contribute color to coatings, any color was rapidly bleached on UV exposure with a dependency on tannin content, degree of modification, and coating formulation pH. Moreover, through manipulating tannin addition levels, this tannin decolorization could offset typical wood darkening associated with UV exposure to provide low or no wood color change over longer exposure periods. With the photooxidative stability efficacy of tannins established on exterior exposure, condensed tannins in native and modified form offer potential as sustainable functional additives for the coatings sector. Note de contenu : - METHODS AND MATERIALS : Materials - Modification of coatings - Coating application and evaluation - Accelerated weathering - Exterior exposure weathering - Color assessments - Coating evaluations - RESULTS AND DISCUSSION : Artificial weathering evaluation - Exterior weathering evaluation - Coating color contributed by tannin DOI : 10.1007/s11998-018-0086-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0086-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31339 [article]

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Preparation and properties of waterborne polyurethane modified by stearyl acrylate for water repellents in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1283-1292 Titre : Preparation and properties of waterborne polyurethane modified by stearyl acrylate for water repellents Type de document : texte imprimé Année de publication : 2018 Article en page(s) : p. 1283-1292 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylate de stéaryle Caractérisation Emulsions -- Stabilité Enduction textile Essais (technologie) Granulométrie Humidité -- Absorption:Eau -- Absorption Imperméabilisation Polymères -- Synthèse Polymères en émulsion Polyuréthanes Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Double bond end-capped waterborne polyurethane (DWPU) was synthesized from toluene diisocyanate, hydroxypropyl polysiloxane, trimethylolpropane, N-methyldiethanolamine, and hydroxyethyl acrylate. Then water repellents with long-chain hydrophobic alkyl structure were obtained by radical copolymerization of stearyl acrylate (SA) and DWPU. The waterproofing performance and other properties of the water repellents were studied for different SA contents. The results showed that, for the water repellent with SA content of 50 wt%, the water absorption of the film reduced to 4.29% while the water contact angle of fabric coated by the water repellent rose to 141.5°. In addition, the optimum SA content of the water repellent was 40%, achieving the highest score of 85 points in the waterproof performance evaluation. Note de contenu : - EXPERIMENTAL : Materials - Preparation of DWPU - Preparation of staryl acrylate-modified waterborne polyurethane (SAWPU) - Preparation of test samples - Characterization and testing - RESULTS AND DISCUSSION : IR characterization of SAWPU - Appearance and stability of SAWPU emulsions - Particle size and viscosity of SAWPU emulsions - Water absorption of SAWPU - Surface energy and lag angle of SAWPU films - Water repellency of fabric coated by SAWPU emulsion - Static contact angle of fabric - Surface morphology of fabrics - Color difference - Washing resistance of coated fabric DOI : 10.1007/s11998-018-0096-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0096-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31343 [article]

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Synthesis of electroactive tetraaniline-based acrylic polyol by atom transfer radical polymerization for anticorrosive coating application / Gunawant P. Lokhande in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1293-1309 Titre : Synthesis of electroactive tetraaniline-based acrylic polyol by atom transfer radical polymerization for anticorrosive coating application Type de document : texte imprimé Auteurs : Gunawant P. Lokhande, Auteur ; Ramanand N. Jagtap, Auteur Année de publication : 2018 Article en page(s) : p. 1293-1309 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Conducteurs organiques Copolymères séquencés Polyacrylate de butyle Polymères -- Synthèse Polymérisation radicalaire par transfert d'atome Polyméthacrylate de glycidyle Polyols Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, block copolymers of butyl acrylate and glycidyl methacrylate (GMA) having molecular weights 10,000 Da were synthesized with varied GMA block lengths by 10%, 20%, and 30% using atom transfer radical polymerization. The synthesized copolymers were further reacted with tetraaniline to formulate conductive polyol and further characterized by mass spectroscopy, UV–visible spectroscopy, 1HNMR, and FTIR. The block copolymers formed were evaluated by gel permeation chromatography, Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry, and nuclear magnetic resonance (NMR) techniques for structural elucidation. These polyols were formed with 10, 20, and 30 wt% with isocyanate (HDI N-3300) to form a polyurethane. The effect of concentration of conducting polyol on anticorrosive coating performance properties, namely mechanical and optical properties, was further studied. The anticorrosive performance was evaluated by salt spray test and electrochemical impedance spectroscopy. Note de contenu : - EXPERIMENTAL : Materials - Methods - CHARACTERIZATION : Physicochemical analysis of copolymer - UV-visible spectroscopy - Mass spectroscopy - Fourier transform infrared spectroscopy - 1H Nuclear magnetic resonance spectroscopy - GPC - Differential scanning calorimetry - Thermogravimetric analysis - Electrochemical impedance spectroscopy (EIS) - Electrical conductivity measurement - Gloss of paint - Water absorption behavior - Mechanical properties of coating - RESULTS AND DISCUSSION : Physicochemical analysis - FTIR - Mass spectroscopy of tetraaniline - UV-visible spectroscopy of tetraaniline and polyol (MPBGCP) - HNMR spectroscopy - Molecular weight determination by gel permeation chromatography - Differential scanning calorimetric analysis - Anticorrosive properties - Conductivity measurements - GLOSS OF COATINGS : Water absorption - Mechanical properties of coatings DOI : 10.1007/s11998-018-0077-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0077-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31344 [article]

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Evaluation of the effect of surface coatings on protection of concrete against sewage-induced degradation based on gray correlation analysis / Lijuan Kong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1311-1323 Titre : Evaluation of the effect of surface coatings on protection of concrete against sewage-induced degradation based on gray correlation analysis Type de document : texte imprimé Auteurs : Lijuan Kong, Auteur ; Jun Fang, Auteur ; Zhigang Wu ; Bei Zhang Année de publication : 2018 Article en page(s) : p. 1311-1323 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Brai de houille Eaux usées Epoxydes Imperméabilisation Matériaux cimentaires Matériaux cimentaires -- Revêtements protecteurs Revêtement de surface Revêtements protecteurs -- Détérioration Index. décimale : 667.9 Revêtements et enduits Résumé : Surface coating is the most widely used measure in engineering projects for protecting concrete against sewage attack. In this study, three types of conventional surface coating, including epoxy coal tar pitch coating (ECTPC), cement-based capillary crystalline waterproofing coating (CCCWC), and cement-based bactericidal coating (CBC) were examined for such purpose, and their performance of resisting sewage, water, acid, abrasion, and microbial erosion was investigated. Moreover, the gray theory method was adopted to find out the primary index of coatings that affected their protection of concrete against sewage-induced degradation (SID). The results revealed that ECTPC provided the best protection for concrete against sewage attack, due to the joint effects of its water resistance, resistance to flow erosion and bactericidal function. For the two inorganic coatings, there was no apparent difference between them in the bond strength and wear time. Although the water resistance of CCCWC was better than that of CBC, its resistance to sewage attack was worse. This was mainly attributed to the bactericide component in CBC, only a small number of cells can be observed in the attached biofilm layer. The gray correlation analysis indicates that the resistance to microbial growth of coating is the most critical factor of the SID of concrete. Also, the coatings acid resistance had the lowest correlation degree with its resistance to SID. Therefore, the effect of killing microorganisms at the origin is better than that of preventing or slowing down the penetration of sewage. These findings can be used to guide the selection of coatings in concrete sewers to control SID. Note de contenu : - EXPERIMENTAL : Concrete specimens - Surface coatings - Test methods - RESULTS AND DISCUSSION : Resistance to water immersion - Resistance to acid attack - Resistance to flow erosion - Resistance to microbial growth - Resistance to sewage attack - Gray correlation analyis DOI : 10.1007/s11998-018-0079-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0079-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31345 [article]

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Synthesis of ZnS–Mn nano-luminescent pigment for ink applications in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1325-1332 Titre : Synthesis of ZnS–Mn nano-luminescent pigment for ink applications Type de document : texte imprimé Année de publication : 2018 Article en page(s) : p. 1325-1332 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation 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). Encre Lin et constituants Le lin cultivé (Linum usitatissimum) est une plante annuelle de la famille des Linaceae cultivée principalement pour ses fibres, mais aussi pour ses graines oléagineuses. Les fibres du lin permettent de faire des cordes, du tissu (lin textile pour ses qualités anallergiques, isolantes et thermorégulateurs), ou plus récemment des charges isolantes pour des matériaux de construction. Les graines sont utilisées pour produire de l'huile de lin pour l'industrie de l'encre et de la peinture, pour la consommation humaine et animale, à cause de sa richesse en oméga 3. Le lin est une des rares fibres textiles végétales européennes. Elle a comme caractéristiques la légereté, la rigidité et la résistance et comme particularité d'être une fibre longue (plusieurs dizaines de centimètres), par rapport aux fibres courtes (coton, chanvre) ou moyennes (laine). Luminescence Manganèse Nanoparticules Photoluminescence Pigments à effets spéciaux Polyamide 66 Polyvinylpyrrolidone Rhéologie Sérigraphie Sulfure de zinc Textiles et tissus Textiles et tissus imprimés Index. décimale : 667.9 Revêtements et enduits Résumé : In the present study, ZnS–Mn nano-luminescent pigments were synthesized, using co-precipitation method. Polyvinylpyrrolidine (PVP) surface modifier and Mn dopant concentrations were considered as affecting parameters. The luminescent ink was loaded with two different concentrations of pigments. The obtained ink was silk-screened on different types of fabrics mainly treated cotton, cotton and nylon. Structure, microstructure, luminescent properties of nano-pigments, inks and fabrics and also rheological properties of the inks were investigated. The results showed that the ceramic ink prepared with nano-luminescent pigment had high photoluminescence (PL) intensity. Moreover, the optimum concentrations of Mn and PVP for obtaining maximum PL intensity were found as 2 and 5 wt%, respectively. SEM images of fabrics indicated that nanoparticles were loaded, nonuniformly, on the fibers. The treated linen and nylon fabrics showed maximum and minimum PL intensity, respectively, due to ink penetration depth in the fabrics. Furthermore, washing fastness estimated for all fabrics was in the proper range. Note de contenu : - EXPERIMENTAL : Materials - Synthesis method - Characterization - RESULTS AND DISCUSSION : Characterization of ZnS-Mn nanostructure pigments - Printed fabrics - Ink rheology DOI : 10.1007/s11998-018-0081-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0081-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31346 [article]

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Polydopamine functional reduced graphene oxide for enhanced mechanical and electrical properties of waterborne polyurethane nanocomposites / Shengwen Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1333-1341 Titre : Polydopamine functional reduced graphene oxide for enhanced mechanical and electrical properties of waterborne polyurethane nanocomposites Type de document : texte imprimé Auteurs : Shengwen Zhang, Auteur ; Dandan Zhang, Auteur ; Zhen Li ; Yifan Yang ; Meng Sun ; Ziwen Kong ; Yang Wang ; Huiyu Bai ; Weifu Dong Année de publication : 2018 Article en page(s) : p. 1333-1341 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Conduction électrique Matériaux hybrides Nanoparticules Nanoparticules -- Synthèse Oxyde de graphène Polydopamine Polymères en émulsion Polyuréthanes Revêtements -- Propriétés mécaniques Revêtements en phase aqueuse -- Additifs Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne polyurethane/polydopamine (PDA) functional reduced graphene oxide (WPU/PDRGO) nanocomposites were prepared by in situ emulsification method. The presence of a PDA layer and the partial reduction of GO by PDA were confirmed by FTIR, XRD, Raman spectra, and TGA. It was found that the interfacial PDA layers facilitated the dispersion of the PDRGO sheets in the WPU matrix and enhanced mechanical properties of the WPU matrix. The resulting WPU/PDRGO nanocomposite coatings show excellent electrical conductivity (9.9 × 10−6–1.1 × 10−4 S cm−1) corresponding to a PDRGO content of 1–16 wt%. The obtained waterborne polyurethane/graphene nanocomposite dispersions are promising for anticorrosion, antistatic, conductive, and electromagnetic interference shielding coatings. Note de contenu : - EXPERIMENTAL : Materials - Dopamine functinalized and reduction of graphene oxide - Preparation of WPU/PDRGO nanocomposites - Characterization - RESULTS AND DISCUSSION : Functionalization and reduction of GO by dopamine - WPU/PDRGO nanocomposites synthesis and characterization - Mechanical properties of WPU/PDRGO nanocomposite films - Electrical conductivity of the WPU/PDRGO nanocomposite coating - Thermal stability of the WPU/PDRGO nanocomposite films DOI : 10.1007/s11998-018-0082-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0082-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31347 [article]

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Preparation, characterization, and properties of graphene oxide/urushiol-formaldehyde polymer composite coating / Lei Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1343-1356 Titre : Preparation, characterization, and properties of graphene oxide/urushiol-formaldehyde polymer composite coating Type de document : texte imprimé Auteurs : Lei Zhang, Auteur ; Haitang Wu, Auteur ; Ming Wei ; Zeyu Zheng ; Dinh Duy Vu ; Thi Tuyet Xuan Bui ; Xiaohua Huang Année de publication : 2018 Article en page(s) : p. 1343-1356 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Copolymère urushiol formaldéhyde Dispersions et suspensions -- Stabilité Electrochimie Revêtements Revêtements -- Propriétés mécaniques Revêtements -- Propriétés physiques Urushiol L’urushiol est une toxine organique que l'on trouve dans les plantes de la famille des Anacardiaceae, spécialement dans le genre Toxicodendron (par exemple le sumac grimpant en Amérique du Nord). Il provoque des allergies de la peau ou dermatites, pouvant être importantes, au contact de ces plantes. Le nom vient du mot japonais urushi (漆?), qui désigne une laque produite dans l'Asie orientale à partir du suc des arbres kiurushi (arbre à laque). L'oxydation et la polymérisation de l'urushiol dans le suc de l'arbre en présence d'humidité permet de former une laque dure utilisée traditionnellement pour produire des objets d'art laqués en Chine et au Japon. Index. décimale : 667.9 Revêtements et enduits Résumé : Graphene oxide (GO) was modified by 3-methacryloxypropyltrimethoxysilane (MPS) to obtain modified graphene oxide (MGO). MGO was dispersed in urushiol-formaldehyde polymer by mechanical mixing and ultrasonic dispersion, and MGO/urushiol-formaldehyde polymer (UFP) coatings with different MGO contents were fabricated. The microstructure, physico-mechanical properties, and electrochemical properties of the MGO/UFP composite coatings were investigated. The results indicated that the hardness, adhesion, and corrosion resistance of the MGO/UFP composite coatings were obviously enhanced compared with the pure UFP coatings. The hardness and the adhesion grade of the MGO/UFP composite coatings with 3.5 wt% MGO (GO, 1.5 wt%, and MPS, 2.0 wt%) reached 6H and 2, respectively. Additionally, GO connected with MPS by chemical bond and the well-dispersed MGO in UFP could significantly enhance the anticorrosion performance of the UFP coatings, which could result from bending the diffusion pathway of penetrant species in the UFP coating matrix. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of the GO/UFP and MGO/UFP composite coatings - Preparation of the MGO/UFP composite films - Characterization of the MGO/UFP composite coatings - Chemical corrosion-resistant property - Electrochemical measurements - RESULTS AND DISCUSSION : The dispersion stability of the GO suspension - Characterization of the MGO/UFP composite coatings - Electrochemical measurements DOI : 10.1007/s11998-018-0084-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0084-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31348 [article]

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Synergistic effects of aluminum hydroxide on improving the flame retardancy and smoke suppression properties of transparent intumescent fire-retardant coatings / Long Yan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1357-1369 Titre : Synergistic effects of aluminum hydroxide on improving the flame retardancy and smoke suppression properties of transparent intumescent fire-retardant coatings Type de document : texte imprimé Auteurs : Long Yan, Auteur ; Zhisheng Xu, Auteur ; Xinghua Wang ; Nan Deng ; Zhiyong Chu Année de publication : 2018 Article en page(s) : p. 1357-1369 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anti-fumée Calorimétrie Copolymère mélamine-formaldéhyde Essais de comportement au feu Fourier, Spectroscopie infrarouge à transformée de Hydroxyde d'aluminium Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Revêtements -- Propriétés thermiques Revêtements protecteurs Stabilité thermique Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : A series of novel aluminum phosphate ester (APEA) flame retardants were synthesized by the salification of cyclic phosphate ester acid (PEA) with different mass ratios of aluminum hydroxide (ATH) and thoroughly characterized by Fourier transform infrared (FTIR) spectroscopy and 1H nuclear magnetic resonance spectroscopy. The PEA and APEAs were thoroughly mixed with melamine formaldehyde resin to produce five kinds of transparent fire-retardant coatings. The synergistic effects of ATH on the thermal stability, flame retardancy, and smoke suppression properties of the coatings were investigated by different analytical instruments. The results show that the incorporation of ATH greatly decreases the weight loss, char index, flame spread rating, heat release rate, total heat release, smoke production rate, total smoke release and specific optical density in the coatings applied to plywood boards, which is ascribed to a more compact and intumescent char formed during burning, as determined from digital photographs and scanning electron microscopy images. The synergistic effects of ATH in the coatings depend on the content of ATH, and an excessive amount of ATH diminishes the synergistic effects on the flame retardancy and smoke suppression properties based on fire protection tests and cone calorimeter test. Thermo-gravimetric analysis reveals that the thermal stability and char-forming ability of the coatings gradually improve with increasing loading of ATH. FTIR analysis demonstrates that the incorporation of ATH forms a more phosphorus-rich crosslinked char and aromatic char during burning, thus effectively reducing the mass loss, heat release, and smoke production and exhibiting excellent synergistic flame retardant and smoke suppression effects in the coatings. Note de contenu : EXPERIMENTAL : Materials - Synthesis of PEA and the APEAs - Preparation of transparent fire-retardant coatings - Measurements and characterization - RESULTS AND DISCUSSION : Characterization of PEA and the APEAs - Thermal stability analysis - Fire protection test - Cone calorimeter test - Smoke density test - Component analysis of the char residue DOI : 10.1007/s11998-018-0069-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0069-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31349 [article]

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Synthesis and characterization of polyurethane/reduced graphene oxide composite deposited on steel / Eric C. Romani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1371-1377 Titre : Synthesis and characterization of polyurethane/reduced graphene oxide composite deposited on steel Type de document : texte imprimé Auteurs : Eric C. Romani, Auteur ; Stefania Nardecchia, Auteur ; Cecilia Vilani ; Shaojun Qi ; Hanshan Dong ; Fernando L. Freire Année de publication : 2018 Article en page(s) : p. 1371-1377 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. Anticorrosifs Anticorrosion Caractérisation Corrosion Matériaux hybrides Métaux -- Revêtements protecteurs Oxyde de graphène Polyuréthanes Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : There has been an ongoing effort by the coatings industry to improve surface properties in order to increase corrosion and wear resistances, as well as other material properties. In this work, we report a methodology for producing nanocomposite films of polyurethane and graphene oxide and polyurethane and reduced graphene oxide. The coatings were applied on steel. The nanocomposites coatings were characterized by optical microscopy, scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, contact angle measurements, and electrochemical impedance spectroscopy. Corrosion tests reveal that the use of reduced graphene oxide increases corrosion resistance when compared with the use of graphene oxide as filler. DOI : 10.1007/s11998-018-0088-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0088-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31350 [article]

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Enhancing coated paper mechanical properties via doping kaolin with ammonium molybdate / Samya El-Sherbiny in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1379-1390 Titre : Enhancing coated paper mechanical properties via doping kaolin with ammonium molybdate Type de document : texte imprimé Auteurs : Samya El-Sherbiny, Auteur ; Nivin M. Ahmed, Auteur Année de publication : 2018 Article en page(s) : p. 1379-1390 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Kaolin Molybdate d'ammonium Papier -- Propriétés mécaniques Papier et carton couché Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : Mechanical properties of paper coating layers are very important in converting and printing operations. Kaolin is commonly used in paper coating as cheap pigment in addition to its superior properties. In this study, a new approach for improving coated paper mechanical properties using doped kaolin with ammonium molybdate was presented. Kaolin and modified kaolin were characterized using several analyses tools (e.g., XRD, SEM, and EDX), and then they were applied in paper coating mixture. The results revealed that the dopant was found in the kaolin as MoOx; this oxide form with its needle shapes led to change in the kaolin crystals, and its presence in high concentrations led to exfoliation of kaolin. Also, at high concentration it was found that MoOx reacted with γ-alumina that is found in kaolin after its heating at 300°C to form aluminum molybdate. It can be observed that modified kaolin increased the coated paper porosity and consequently the opacity; also bulk and thickness were increased. Significant improvement in coated paper tensile strength, bursting strength, tensile energy absorption, and bending stiffness was also noticed. Thermal study also showed that increasing the concentration of ammonium molybdate increased the heat stability of the coated paper. Note de contenu : - EXPERIMENTAL : Materials - Chemical treatment of kaolin - Preparation of coating mixture - Preparation of coated paper samples - Characterization fo the treated kaolin and coated paper samples - RESULTS AND DISCUSSION : Characterization of unmodified kaolin and modified kaolin - Coated paper properties - Thermal analysis of coated paper DOI : 10.1007/s11998-016-9903-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9903-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31355 [article]

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Hybrid multilayer thin-film fabrication by atmospheric deposition process for enhancing the barrier performance / Srikanth Jagadeesan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1391-1399 Titre : Hybrid multilayer thin-film fabrication by atmospheric deposition process for enhancing the barrier performance Type de document : texte imprimé Auteurs : Srikanth Jagadeesan, Auteur ; Jong Hwan Lim, Auteur ; Kyung Hyun Choi ; Yang Hoi Doh Année de publication : 2018 Article en page(s) : p. 1391-1399 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces multicouches Dépôt de couches minces atomiques Matériaux -- Propriétés barrières Morphologie (matériaux) Revêtements -- Propriétés mécaniques Revêtements -- Propriétés optiques Surfaces -- Analyse Traitement rouleau à rouleau Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, a multilayer barrier thin film, based on polyvinylidene difluoride (PVDF)–silicon dioxide (SiO2), has been fabricated on a PET substrate through a novel method of joint fabrication techniques. The inorganic SiO2 thin film was deposited using a roll-to-roll atmospheric atomic layer deposition system (R2R-AALD), while the organic PVDF layer was deposited on the surface of SiO2 through the electrohydrodynamic atomization (EHDA) technique. The multilayer barrier thin films exhibited very good surface morphology, chemical composition, and optical properties. The obtained values for arithmetic surface roughness and water contact angle of the as-developed multilayer barrier thin film were 3.88 nm and 125°, respectively. The total thickness of the multilayer barrier thin film was 520 nm with a high optical transmittance value (85–90%). The water vapor transmission rate (WVTR) of the barrier thin film was ~ 0.9 × 10−2 g m−2 day−1. This combination of dual fabrication techniques (R2R-AALD and EHDA) for the development of multilayer barrier thin films is promising for gas barrier applications. Note de contenu : - EXPERIMENTAL DETAILS : Materials and method - Roll-to-roll atmospheric atomic layer deposition of SiO2 - PVDF deposition through EHDA technique - Characterization - RESULTS AND DISCUSSION : Surface morphology - Compositional analysis - Optical properties - Barrier properties - Mechanical property DOI : 10.1007/s11998-018-0090-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0090-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31356 [article]

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How rheological properties affect fine-line screen printing of pastes : a combined rheological and high-speed video imaging study / Chenhui Xu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1401-1412 Titre : How rheological properties affect fine-line screen printing of pastes : a combined rheological and high-speed video imaging study Type de document : texte imprimé Auteurs : Chenhui Xu, Auteur ; Norbert Willenbacher, Auteur Année de publication : 2018 Article en page(s) : p. 1401-1412 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Imagerie (technique) Rhéologie Sérigraphie Index. décimale : 667.9 Revêtements et enduits Résumé : Fine-line screen printing is still a great challenge due to the lack of overall understanding between the rheological properties and screen printing process. Here, we prepared ZnO pastes including ethyl cellulose or Thixatrol Max as an additive introducing different physical mechanisms of structure and flow control. Yield stress, viscosity, and its recovery after high shear were obtained using rotational rheometry. Filament breakup was determined in uniaxial elongational tests. Pastes were printed using a commercial screen designed for Si-solar cell front-side metallization, and the process was monitored with high temporal and spatial resolution using a transparent glass substrate and a high-speed imaging setup. Length of the pre-injection zone ahead of the squeegee scales inversely with yield stress and length of the cling zone behind the squeegee is proportional to filament rupture strain, irrespective of used additive. Paste spreading observable at the busbar and fine-line intersection takes place within 100 ms, irrespective of sample composition, demonstrating that fine-line electrode width is determined within the pre-injection zone where the paste is under pressure. A simple flow model is proposed relating electrode width to the reciprocal product of yield stress and high shear viscosity consistent with experimental data including both types of pastes. Note de contenu : - MATERIALS AND PREPARATION - EXPERIMENTS : Rheological measurements - High-speed video imaging of the screen printing process - RESULTS AND DISCUSSION : Rheological properties of pastes - Correlation of printing process features and rheological paste rheological properties - Printed electrode width DOI : 10.1007/s11998-018-0091-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0091-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31357 [article]

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Preparation and properties of hybrid epoxy/hydro-terminated polybutadiene/modified MMT nanocomposites / Hongling Yi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1413-1422 Titre : Preparation and properties of hybrid epoxy/hydro-terminated polybutadiene/modified MMT nanocomposites Type de document : texte imprimé Auteurs : Hongling Yi, Auteur ; Ting Wei, Auteur ; Heng Lin ; Junjie Zhou Année de publication : 2018 Article en page(s) : p. 1413-1422 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites -- Propriétés mécaniques Epoxydes Montmorillonite Nanostructures Polybutadiène Polymères à terminaison hydroxyle Rupture (mécanique) Index. décimale : 667.9 Revêtements et enduits Résumé : The effects of hydroxyl-terminated polybutadiene (HTPB) number average molecular weight ( \overline{{\boldsymbol{M\fancyscript{n}}}} ) and preparation temperature on montmorillonite (MMT) intercalation/exfoliation behavior were investigated. X-ray diffraction and Fourier transform infrared spectroscopy results indicated that 40 to 80°C were the preferred temperatures to obtain nanostructured HTPB/MMT. The higher \overline{{\boldsymbol{M\fancyscript{n}}}} (> 2800) of HTPB led to a more exfoliated nanostructure than lower \overline{{\boldsymbol{M\fancyscript{n}}}} as proven by transmission electron microscopy. The tensile strength, tensile modulus, and elongation at break of nanostructured HTPB/MMT/EP ternary composites were higher than those of the HTPB/EP binary blend, which was due to the HTPB/MMT hybrid structure. The effect of increasing molecular weight on impact strength in the ternary system was less than that in the binary system. The HTPB/MMT/epoxy hybrid composites with low concentration could improve the impact strength, which was due to the superposition effect of organic/inorganic nanostructures. In hybrid HTPB/MMT/epoxy composite system, the toughening was attributed to the slow crack growth and fast crack growth, and the dissipated energy of pulling or debonding nanoclay out from the matrix also contributed. Note de contenu : - EXPERIMENTAL WORK : Materials - Preparation of HTPB/MMT composites - Preparation of HTPB-EP binary blend and HTPB/MMT/EP ternary composites - Analysis and characterization - RESULTS AND DISCUSSION : Preparation of nanostructured MMT/HTPB - The mechanical properties of EP composites - Fracture morphology and failure mechanisms DOI : 10.1007/s11998-018-0093-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0093-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31362 [article]

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Homogeneity analysis of square meter-sized electrodes for PEM electrolysis and PEM fuel cells / Andrea Burdzik in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1423-1432 Titre : Homogeneity analysis of square meter-sized electrodes for PEM electrolysis and PEM fuel cells Type de document : texte imprimé Auteurs : Andrea Burdzik, Auteur ; Markus Stähler, Auteur ; Irene Friedrich ; Marcelo Carmo ; Detlef Stolten Année de publication : 2018 Article en page(s) : p. 1423-1432 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Electrolyse Enduction par filière Membranes (technologie) Piles à combustible Poids Polyélectrolytes Revêtements Supports de catalyseurs Index. décimale : 667.9 Revêtements et enduits Résumé : Electrodes for polymer electrolyte membrane electrolyzers and fuel cells are manufactured by coating a catalyst dispersion, consisting of precious metal, ionomer and solvents, onto a substrate that is subsequently dried. One target of current research is to produce square meter-sized electrodes, but so far the homogeneity that can be achieved in this scaling is unclear. To quantify the achievable homogeneity of an electrode, manufactured by means of slot die coating in a roll-to-roll pilot plant, this study focuses first on the selection of an appropriate substrate by investigating thickness, basis weight and surface free energy distribution at the square meter scale. Afterward, a dispersion is coated on the selected substrate, dried and investigated with respect to thickness and basis weight distribution. Among the investigated substrates, Kapton has the smallest scatter in terms of thickness and basis weight. The subsequent coating results in a precious metal loading of 1.10 mg cm−2, with a scattering of 5.5% that can be further reduced to 4.5% when edge effects can be prevented. These results are now available for further research in which it is necessary to investigate whether or not these fluctuations affect the achievable electrochemical efficiencies of electrodes. Note de contenu : - EXPERIMENTAL : Thickness and basis weight distribution - Surface free energy distribution - Substrate coating - Catalyst basis weight distribution - RESULTS AND DISCUSSION : Catalyst dispersion analysis - Laboratory-scale coating - Thickness and basis weight distribution of decal substrates - SFE distribution of decal substrate - Thickness and basis weight distribution of the coated substrate DOI : 10.1007/s11998-018-0074-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0074-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31363 [article]

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Direct electroplating of nickel on ABS plastic using polyaniline–silver surface composite synthesized using different acids / Maryam Mehdizadeh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1433-1442 Titre : Direct electroplating of nickel on ABS plastic using polyaniline–silver surface composite synthesized using different acids Type de document : texte imprimé Auteurs : Maryam Mehdizadeh, Auteur ; Mehdi Khorasanian, Auteur ; Seyyed Mohammad Lari Baghal Année de publication : 2018 Article en page(s) : p. 1433-1442 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Argent Conduction électrique Dépôt électrolytique Fourier, Spectroscopie infrarouge à transformée de Matières plastiques -- Revêtement Microscopie électronique à balayage Nickel Le nickel est un élément chimique, de symbole Ni et de numéro atomique 28. Le nickel est un métal blanc argenté qui possède un éclat poli. Il fait partie du groupe du fer. C'est un métal ductile (malléable). On le trouve sous forme combinée au soufre dans la millérite, à l'arsenic dans la nickéline. Grâce à sa résistance à l'oxydation et à la corrosion, il est utilisé dans les pièces de monnaie, pour le plaquage du fer, du cuivre, du laiton, dans certaines combinaisons chimiques et dans certains alliages. Il est ferromagnétique, et est fréquemment accompagné de cobalt. Il est particulièrement apprécié pour les alliages qu'il forme. Particules (matières) Polyacrylonitrile Polyaniline Surfaces -- Analyse Terpolymère acrylonitrile butadiène styrène Index. décimale : 667.9 Revêtements et enduits Résumé : Nickel coating was directly electroplated on acrylonitrile butadiene styrene (ABS) plastic substrate using a new method. The substrate surface was first coated by thin polyaniline film, then silver particles were deposited on the surface in order to improve the electrical conductivity. Three different acids (perchloric, nitric, and sulfuric acid) were used to synthesize the primary polyaniline film. The method adopted in the present study was not based on incorporation of silver particles within the polyaniline matrix; rather, the silver was deposited on the substrate surface. The electrical conductivity of the samples was increased to a level high enough for direct electroplating of nickel. The sample synthesized using nitric acid showed the finest grain size (1.57 µm) and greatest thickness of the final nickel coating (57 µm). The sample synthesized using sulfuric acid exhibited the lowest electrical resistance (0.008 Ω). In addition, the nickel coating deposited on the surface of the sample synthesized using perchloric acid exhibited the strongest adhesion to the substrate (5B according to ASTM standard). Note de contenu : - EXPERIMENTAL : Materials - Procedure - Surface characterization - RESULTS AND DISCUSSION : FTIR spectra - Scanning electron microscopy (SEM) - Electrical conductivity - Adhesion DOI : 10.1007/s11998-018-0075-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0075-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31364 [article]

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