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Iron as an alternative drier for curing of high-solid alkyd coatings / Barbara Pirš in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 965-974 Titre : Iron as an alternative drier for curing of high-solid alkyd coatings Type de document : texte imprimé Auteurs : Barbara Pirš, Auteur ; Bogdan Znoj, Auteur ; Saša Skale, Auteur ; Jožefa Zabret, Auteur ; Jerneja Godnjavec, Auteur ; Peter Venturini, Auteur Année de publication : 2015 Article en page(s) : p. 965-974 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fer Fourier, Spectroscopie infrarouge à transformée de Polyalkydes Revêtements:Peinture Rhéologie Siccatifs Un siccatif est une substance qui joue un rôle de catalyseur en accélérant le séchage ou durcissement (polymérisation) d'un matériau tel une huile ou une peinture à base d'huile (pour le bâtiment ou les artistes). Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Alkyds are widely used polymers in the coating industry for decorative and industrial applications due to their low price, performance, diversity, and containment of renewable constituents. They have been of particular interest in research over the past decade owing to new legislative requirements focused on the reduction of volatile organic coatings (VOC) and the replacement of Cobalt (Co) driers. In the present work, the commercially accessible Fe (bispidon) drier and the Co (bis (2-ethylhexanoate)) drier were studied in high-solid (HS) alkyd coatings that are consistent with allowed VOC values as stipulated by actual EU legislation. Curing kinetic properties of the alkyd oxidation process were analyzed using FTIR spectroscopy. The influence of Fe and Co driers on crosslinking was further evaluated in terms of viscoelastic properties and surface hardness measurements. Finally, cured coating films were compared with the EIS method in order to determine the influence of driers on crosslinked polymer structures and pore resistance of HS alkyd coatings. We compared Fe and Co driers in HS long-oil alkyd coatings. Coatings with Fe drier showed comparable Final Drying Times but dissimilar crosslinking kinetic activity compared with the Co drier. Fe drier enable more uniformity through the entire thickness of the HS alkyd coating and consequently has lower diffusion of ions through the film. Note de contenu : - EXPERIMENTAL : Materials and sample preparation - analytical methods - RESULTS AND DISCUSSION : Film formation characteristics - Chemical curing during film formation process - Physical properties of coating film - Electrochemical characteristics of cured coating film DOI : 10.1007/s11998-015-9724-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9724-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24930 [article]

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Estimation of long-term drag performance of fouling control coatings using an ocean-placed raft with multiple dynamic rotors / A. Lindholdt in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 975-995 Titre : Estimation of long-term drag performance of fouling control coatings using an ocean-placed raft with multiple dynamic rotors Type de document : texte imprimé Auteurs : A. Lindholdt, Auteur ; Kim Dam-Johansen, Auteur ; D. M. Yebra, Auteur ; S. M. Olsen, Auteur ; Søren Kiil, Auteur Année de publication : 2015 Article en page(s) : p. 975-995 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calcul Encrassement Essais dynamiques Mesure Résistance à la salissure Revêtements antisalissures:Peinture antisalissures Salissures biologiques Salissures marines Index. décimale : 667.9 Revêtements et enduits Résumé : An experimental setup was designed and built to estimate changes in the skin friction of fouling control coatings (FCC) over an extended period of time in conditions simulating the vast majority of ship profiles (regarding speed and activity) in the present market. The setup consisted of two separate parts: one aged FCCs directly in seawater in a dynamic manner by simulating the exposure condition of a ship’s hull, and a second, laboratory part measured the torque (drag) of aged coatings in a rotary setup. From the spring to the autumn of 2013 and 2014, four commercial FCCs were exposed for 53 weeks in Roskilde Fjord, Denmark, which is characterized by relatively cold seawater and a salinity of approximately 1.2 wt%. The in situ immersion seawater conditions consisted of five-week cycles divided into 2 weeks of static immersion and 3 weeks of dynamic immersion, during which time the cylinders were rotated at a tangential velocity of 8.1 knots. The skin friction was found to generally increase more during the static period, compared to the dynamic ones. Over the course of the entire exposure period, the skin friction of the investigated FCCs decreased in the following order: fluorinated fouling release coating (FRC) (highest skin friction), hydrogel-based FRC without biocides, silylated acrylate self-polishing copolymer coating, and hydrogel-based FRC with biocides (lowest skin friction). However, the differences in skin friction between the latter three coatings were minor and often within the range of experimental uncertainty. The average surface roughness of the FCCs in the newly applied and mechanically cleaned condition, determined as the Rt(50) and R z parameters, was evaluated as poor predictors of skin friction. Note de contenu : - EXPERIMENTAL SETUP : Drag performance measurement setup - Aging setup - Measurement procedure - MATERIALS AND SAMPLE PREPARATION : Surface roughness measurements - CONVERSION OF TORQUE INTO FRICTION COEFFICIENTS : Conversion of laboratory torque values into friction coefficients for cylinders and flat plates - Estimation of the experimental uncertainty - RESULTS AND DISCUSSION : Smooth cylinder - Material properties - Visual biofouling grading - Drag performance of fouling control coatings - Fuel and power predictions for a tanker DOI : 10.1007/s11998-015-9713-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9713-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24931 [article]

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Influence of alcohols on stability and mechanical properties of polyacrylate coating material / Dangge Gao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 997-1004 Titre : Influence of alcohols on stability and mechanical properties of polyacrylate coating material Type de document : texte imprimé Auteurs : Dangge Gao, Auteur ; Wenbo Zhang, Auteur ; Jianzhong Ma, Auteur ; Congmin Li, Auteur ; Jing Zhang, Auteur Année de publication : 2015 Article en page(s) : p. 997-1004 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcools Couches minces -- Propriétés mécaniques Couches minces -- Stabilité Latex Polyacrylates Polymères -- Propriétés mécaniques Index. décimale : 667.9 Revêtements et enduits Résumé : Alcohols such as ethanol, isopropanol, n-propanol, and ethylene glycol were introduced into waterborne polyacrylate latex to study their influence on their stability and mechanical properties of polyacrylate. Ethanol, n-propanol, isopropanol, and ethylene glycol were showed to keep the polyacrylate latex steady when the pH values were higher than 3.00, 6.00, 3.00, and 2.50, respectively, as determined by centrifugation. The latex stability vs time was studied by Turbiscan LAB and the results are in good agreement with the change of latex particle size observed by dynamic light scattering. The results indicate that the particle size was affected by the alcohol molecular structure. Alcohol amounts and type had effects on breaking strength and elongation at break of polyacrylate film to varying degrees. The latex film-forming process was measured and morphology of the latex film was observed by scanning electron microscope. Different performances of mechanical properties were caused by the morphology of latex film resulting from the forming process. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of polyacrylate latex - Stability of PA incorporated with alcohols - Film preparation - Characterization - RESULTS AND DISCUSSION : Stability of PA latex - Effect of alcohol on physical properties of latex films DOI : 10.1007/s11998-015-9685-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9685-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24932 [article]

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Modified soybean oil as a reactive diluent: coating performance / Priyanka P. Nalawade in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1005-1021 Titre : Modified soybean oil as a reactive diluent: coating performance Type de document : texte imprimé Auteurs : Priyanka P. Nalawade, Auteur ; Mark D. Soucek, Auteur Année de publication : 2015 Article en page(s) : p. 1005-1021 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique Composés organiques -- Synthèse Diluants Formulation (Génie chimique) Huile de soja Polyalkydes Résistance chimique Revêtements -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : A long oil alkyd was formulated with three soybean oil-based reactive diluents. Coatings properties were evaluated as a function of concentration of reactive diluent in the formulation. The tensile, thermomechanical, and general coating properties were evaluated. General coatings properties included crosshatch adhesion, pencil hardness, impact resistance, and solvent resistance. The siloxane and allyl ether-functionalized soybean oil enhanced the tensile modulus and crosslink density by 20% and 70%, respectively. Coatings with fluorine-functionalized soybean oil showed enhanced contact angle and solvent resistance, compared to alkyd coatings alone. The incorporation of reactive diluents in the formulation improved pencil hardness, while other general coating properties were not significantly affected. Note de contenu : - EXPERIMENTAL : Materials - Instrumentation - Sythesis of conjugated soybean oil - Synthesis of fluorine - Functionalized soybean oil - Synthesis of siloxane - Functionalized soybean oil - Synthesis of alkyl ether - Functionalized soybean oil - Synthesis of soybean oil (long oil) alkyd resin - Coating formulation and film preparation - Coating tests - RESULTS : Tensile properties - Dynamic mechanical analysis (DMA) - General coating properties DOI : 10.1007/s11998-015-9691-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9691-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24950 [article]

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Fabrication of superhydrophobic surfaces on FRP composites : from rose petal effect to lotus effect / Jiashu Sun in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1023-1030 Titre : Fabrication of superhydrophobic surfaces on FRP composites : from rose petal effect to lotus effect Type de document : texte imprimé Auteurs : Jiashu Sun, Auteur ; Jigang Wang, Auteur Année de publication : 2015 Article en page(s) : p. 1023-1030 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Carbonate de calcium Le carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole. C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots. Composites à fibres Dioxyde de silicium Hydrophobie Traîtements de surface Tags : 'Surfaces  superhydrophobes'  'Composites  à  fibres'  'Effet  lotus'  pétale  de  rose' Index. décimale : 667.9 Revêtements et enduits Résumé : A simple method is reported for the preparation of superhydrophobic fiber reinforced plastic (FRP) surfaces with controlled adhesion. By simply adjusting the content of CaCO3 and SiO2 of surface coating, after surface treatment, we can obtain the different FRP surfaces with diverse morphologies. The results confirm that the FRP samples not only could achieve superhydrophobicity but also present huge differences in adhesive abilities. The microlens surface presents a strong sticky performance which can hold a 10-μL water droplet even tilted vertically or turned upside down. Such a property is very similar to the rose petal effect. In comparison, the microbowls surface presents a slippery property which can be regarded as a lotus effect. The water roll-off angle is as low as of approximately 9°. At the same time, the adhesion work of the surfaces is decreased from extreme high (34.7 mN/m) to very low (7.9 mN/m). Noticeably, the heat resistance and antifriction of the microbowls surface are better than that of the microlens. Note de contenu : - Materials - The preparation of FRP and surface coating - The preparation of superhydrophobic surfaces of FRP - Characterization DOI : 10.1007/s11998-015-9692-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9692-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24951 [article]

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Variable structural colors and hydrophobicity of SiO2/polyethyleneimine coating on glass substrate / Yongtang Jia in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1031-1039 Titre : Variable structural colors and hydrophobicity of SiO2/polyethyleneimine coating on glass substrate Type de document : texte imprimé Auteurs : Yongtang Jia, Auteur ; Yun Zhang, Auteur ; Guangqing Zhuang, Auteur ; Qinguo Fan, Auteur ; Jianzhong Shao, Auteur ; Guojin Liu, Auteur Année de publication : 2015 Article en page(s) : p. 1031-1039 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Couleur Dioxyde de silicium Hydrophobie Polyéthylèneimine Verre -- Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Films composed of nanoparticles have been commonly used in decorative applications due to their striking colors and useful self-cleaning properties. An efficient option for the structural coloration has been developed through fabrication of the thin films on substrates from SiO2 nanoparticles and PEI. The surface morphology and microstructure of SiO2/polyethyleneimine (PEI) film on glass substrate were analyzed with an SEM, AFM, and thickness analyzer. The homogeneous coatings of limited SiO2 aggregation with air voids were formed on glass substrates. It was strongly suggested that optical properties of the films came from the single-layer thin film interference effect. The structural colors of SiO2/PEI films were captured by digital camera, integrating sphere spectrophotometer and multi-angle spectrophotometer. The results indicated that the films illuminated distinctly as the thickness increased, and presented different lightness values and hues at various viewing angles. Moreover, those films with some surface roughness exhibited high water static contact angle, which endowed the films potential hydrophilicity and self-cleaning property. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Preparation of the solutions - Preparation of the composite SiO2/PEI thin films - Characterization - RESULS AND DISCUSSION : Variable colors through a single-layer interference effect - Structural colors of the SiO2/PEI films with various thickness - Color variation at different angles - Hydrophobic property of the SiO2/PEI coating DOI : 10.1007/s11998-015-9708-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9708-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24952 [article]

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Influences of maleic reactive surfactants with different EO chain lengths on the properties of the acrylate latices / Jianhong Yang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1041-1052 Titre : Influences of maleic reactive surfactants with different EO chain lengths on the properties of the acrylate latices Type de document : texte imprimé Auteurs : Jianhong Yang, Auteur ; Yanhong Zhu, Auteur ; Jianfeng Zhu, Auteur ; Wanghui Liu, Auteur ; Ming Zhou, Auteur ; Lingmin Zhi, Auteur ; Dinglong Li, Auteur ; Qin Shen, Auteur Année de publication : 2015 Article en page(s) : p. 1041-1052 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylates Les monomères acrylates sont un groupe d'esters faisant partie des vinyles, car renfermant une double liaison carbone-carbone et sont utilisés pour former des polyacryliques qui ont de multiples usages. Anhydride maléique Groupe oxyéthylène Latex Polymérisation en émulsion Surfactants Index. décimale : 667.9 Revêtements et enduits Résumé : Three maleic reactive surfactants with different oxyethylene (EO) units (5, 9 and 15) were synthesized and used to prepare the soap-free acrylate latices with methyl methacrylate, butyl acrylate, and hydroxypropyl acrylate as monomers through the polymerization of pre-emulsifying seed emulsion and semi-continuous dropping process. Effects of EO chain lengths on the properties of the latices and their films were investigated. The results showed the polymerization using maleic reactive surfactant with 9 EO units could achieve the highest monomer conversion and the copolymers with highest M w were obtained. The viscosity of latices decreased and their chemical stabilities and particle sizes increased with the increase of EO chain lengths. The EO chain lengths slightly influenced the pencil hardness and adhesion of the latex films, but the shorter the EO chain lengths were, the better were these properties. The amount of maleic reactive surfactants had effects on the properties of the acrylate latices as well. In addition, the results from TEM showed that the latex particles were irregular and there were some “caves” in the particles. It was considered that the particles were formed due to the coil and entanglement of the growing polymer chains in the aqueous phase. Note de contenu : - EXPERIMENTAL : Materials - Preparation of maleic reactive surfactants - Synthesis of soap-free acrylate latex - Characterization - RESULTS AND DISCUSSION : Preparation of maleic reactive surfactants - Effects of maleic reactive surfactants on emulsion polymerization - H NMR analysis - GPC analysis - Effects of surfactants on particle sizes and their distribution - Stability against electrolyte - Viscosity - Effects of reactive surfactants on mechanical properties DOI : 10.1007/s11998-015-9696-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9696-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24956 [article]

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Effect of surface treatments of titanium dioxide pigments on the cure of polyester/triglycidyl isocyanurate powder coatings / Stanley Affrossman in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1053-1064 Titre : Effect of surface treatments of titanium dioxide pigments on the cure of polyester/triglycidyl isocyanurate powder coatings Type de document : texte imprimé Auteurs : Stanley Affrossman, Auteur ; Anthony McKee, Auteur ; Richard A. Pethrick, Auteur Année de publication : 2015 Article en page(s) : p. 1053-1064 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique Dioxyde de titane Isocyanurate de triglycidyle Pigments inorganiques Polyesters Revêtements poudre Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Titanium dioxide pigments will typically have an inorganic surface coating based on a blend of alumina and silica and an organic treatment. Both the organic and inorganic treatments can influence the cure characteristics of polyester powder coatings. This paper attempts to explore the connectivity between the nature of the coating and the cure behavior of a typical heat-cured epoxidized isocyanurate formulation. It is found that a high silica:alumina content in the inorganic pacification layer significantly retards the cure process, but is influenced by the nature of the organic treatment. The organic surface treatment may accelerate or retard the initial cure process and gelation times. Elemental analysis indicates that some of the pigments studied have a significantly higher zirconium content and exhibited enhanced cure rates compared with those with the lower zirconium content. This paper illustrates the potential effects of different grades of titanium dioxide on the cure of polyester powder coatings. Note de contenu : - EXPERIMENTAL : Materials - Titanium dioxide pigments - Surface area measurements - Powder coating production - Strathclyde curometer - Thermally stimulated discharge measurements - Dynamic mechanical thermal analysis - RESULTS AND DISCUSSION : Curometer measurements - Effects of organic surface treatment of the pigment on the cure behavior - Trimethyol propane (TMP)- Triethylamine (TEA) - Trimethyol propane (TMP)/polyethylene wax - Modaflow effects on cure - Effect of pigment loading in a Modaflow-free coating - Effect of pigment loading with 1% Modaflow being present - Effect of pigment loading with 4% Modaflow being present - Conclusion from the curometer study - Thermally stimulated discharge spectroscopy TSD - Dynamic mechanical thermal analysis DOI : 10.1007/s11998-015-9697-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9697-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24957 [article]

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Synthesis of porous magnetite Fe3O4 and its application in thermal control coatings as new black pigment / Moslem Mashayekhi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1065-1071 Titre : Synthesis of porous magnetite Fe3O4 and its application in thermal control coatings as new black pigment Type de document : texte imprimé Auteurs : Moslem Mashayekhi, Auteur ; Kamal Ghani, Auteur ; Reza Shoja Razavi, Auteur ; Narges Kiomarsipour, Auteur Année de publication : 2015 Article en page(s) : p. 1065-1071 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Lumière -- Absorption Magnétite Matériaux poreux Oxyde de fer Pigments -- Synthèse Pigments inorganiques Revêtements -- Propriétés thermiques:Peinture -- Propriétés thermiques Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : In the present work, firstly, porous magnetite Fe3O4 was synthesized using mesoporous silica molecular sieve (SBA-15) as a template. Finally, the infiltrated ferrous precursor into silica mesopores was subjected to an infiltration process, in order to obtain the porous Fe3O4. The structural, morphological, and porosity characteristics and optical property of as-synthesized material were investigated by X-ray diffraction, field emission scanning electron microscopy, N2 adsorption, and diffuse reflectance spectroscopy. Evaluation of the obtained results indicated that the porous Fe3O4 has well-defined morphology and higher light absorption in the UV/Vis region than not only the common Fe3O4 and the other inorganic black pigments, but also common carbon black. Investigation of the prepared coating with this pigment indicated the higher absorption (0.98) and lower reflectance (~2%) than commercial black thermal control coatings (TCC) with inorganic pigments. This pigment presents the best selection for black TCC with inorganic pigment and stable in the space environment. The as-prepared porous magnetite Fe3O4 also has high surface area (~24.78 m2/g) and excellent magnetic properties (M s = 70 emu/g) at room temperature. Note de contenu : - Reagent and materials - Preparation of SBA-15 template - Preparation of porous Fe3O4 - Paint preparation - Materials characterization DOI : 10.1007/s11998-015-9700-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9700-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24958 [article]

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Synthesis of silver nanoparticles embedded novel hyperbranched urethane alkyd-based nanocomposite for high solid antimicrobial coating application / D. Ratna in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1073-1083 Titre : Synthesis of silver nanoparticles embedded novel hyperbranched urethane alkyd-based nanocomposite for high solid antimicrobial coating application Type de document : texte imprimé Auteurs : D. Ratna, Auteur ; R. Baloji Naik, Auteur Année de publication : 2015 Article en page(s) : p. 1073-1083 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Argent Copolymère Alkyde uréthane Microscopie électronique Nanoparticules Polymères ramifiés Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, we describe a simple method for the synthesis of a novel nanocomposite comprising hyperbranched urethane alkyd and silver nanoparticle (embedded in the resin) for a high-solid antimicrobial coating application. During the process, silver benzoate was dispersed in the hyperbranched alkyd (HBA) resin containing free hydroxyl groups and the resin is cured with an isocyanate trimer (Desmodur N3390) to make a silver nanoparticle-based nanocomposite coating. Silver benzoate is reduced by the free radicals, generated from naturally occurring oxidative curing of the fatty acid present in the alkyd resin. Unlike a conventional method, which involves the use of a toxic reducing agent or solvent, the present process does not require any toxic reducing agent for the generation of silver nanoparticles. The formation of silver nanoparticle was confirmed by spectroscopic and electron microscopic analysis. The HBA resin used in this work requires a much lesser amount of solvent for making a coating formulation and offers superior mechanical properties compared to the conventional alkyds. The surfaces coated with the nanocomposite coating showed excellent antimicrobial activity against Serratia marcescens bacteria. Note de contenu : - EXPERIMENTAL : Materials - Preparation of silver nanocomposites - CHARACTERIZATION : UV Visible spectroscopy - Atomic force microscopy (AFM) - Scanning electron microscopy (SEM) - Transmission electron miscroscopy (TEM) - Thermal analysis - Mechanical properties - Testing of antimicrobial activity - Accelerated weathering test - RESULTS AND DISCUSSION : Formation of SNP - UV-Visible spectroscopy - Microscopic analysis - Thermal analysis - Mechanical properties - Testing of antimicrobial activity - Accelerated weathering test DOI : 10.1007/s11998-015-9702-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9702-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24959 [article]

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Urea fertilizer coated with biodegradable polymers and diatomite for slow release and water retention / Jean Felix Mukerabigwi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1085-1094 Titre : Urea fertilizer coated with biodegradable polymers and diatomite for slow release and water retention Type de document : texte imprimé Auteurs : Jean Felix Mukerabigwi, Auteur ; Qing Wang, Auteur ; Xiaoya Ma, Auteur ; Min Liu, Auteur ; Shaojun Lei, Auteur ; Haitao Wei, Auteur ; Xueying Huang, Auteur ; Yu Cao, Auteur Année de publication : 2015 Article en page(s) : p. 1085-1094 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Water  retention'  'Slow  release  fertilizer'  'Coating  material'  Diatomite  Biopolymer  Urea Index. décimale : 667.9 Revêtements et enduits Résumé : Slow release fertilizers (SRFs) are of vital importance to improve agricultural efficiency. However, their use is still limited due to their relatively high costs. Additionally, most of coating materials used to produce SRFs are nonbiodegradable and toxic to the soil. In this context, we utilized various biopolymers such as tamarind, xanthan, and guar gums together with diatomite to coat urea fertilizer granules. In this study, tamarind–urea-diatomite (TUD), guar–urea-diatomite (GUD), and xanthan–urea-diatomite (XUD) SRF granules were prepared in the presence of epichlorohydrin as crosslinker. The nutrients slow release behavior and the water retention capacity of these SRFs in soil were determined. The water absorbency of the product was 89% TUD, 93% GUD, and 142% XUD of its own weight when it was allowed to swell in tap water at room temperature for 2 h. Poly(methacrylic acid) was applied as the outermost layer of XUD to improve the nitrogen slow release efficiency of XUD SRFs. The results showed that the product had an excellent nutrients slow release property of 79.5% and good water retention capacity of 62.9% after 28 days. This suggested that XUDM could effectively improve the utilization of fertilizer. Furthermore, being biodegradable and low cost could be beneficial in agricultural and horticultural applications. Note de contenu : - MATERIALS AND METHODS : Materials - Xanthan gum, tamarind gum, and guar gum viscosity measurement - Preparation of TUD, GUD, and XUD SRF granules - Characterization of the prepared coated urea SFRs - Measurement of water absorbency of TUD, GUD, and XUD SRFs - Slow release behavior of TUD, GUD, and XUD SRFs in soil - Slow release behavior of TUD, GUD, and XUD SRFs in soil - Largest water-holding ratio of soil with TUD, GUD, or XUD SRFs - Measurement of water retention of TUD, GUD, and XUD SRFs - Preparation of enhanced properties efficiency of XUD SRFs - RESULTS AND DISCUSSION : Morphology and characteristics of the coated fertilizers - Polysaccharides viscosity test result - Water absorbency of TUD, GUD, and XUD SRFs test results - Water retention of TUD, GUD, and XUD SRFs in soil - Largest water-holding ratio of soil with TUD, GUD, or XUD SRFs test results - Slow release behavior of TUD, GUD, and XUD SFRs in soil test results - XUD SRFs enhanced properties by applying PMAA as outermost layer DOI : 10.1007/s11998-015-9703-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9703-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24967 [article]

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On the role of water, temperature, and glass transition in the corrosion protection behavior of epoxy coatings for underground pipelines / Hung M. Ha in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1095-1110 Titre : On the role of water, temperature, and glass transition in the corrosion protection behavior of epoxy coatings for underground pipelines Type de document : texte imprimé Auteurs : Hung M. Ha, Auteur ; Akram Alfantazi, Auteur Année de publication : 2015 Article en page(s) : p. 1095-1110 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Hautes températures Pipelines -- Revêtements protecteurs Revêtements -- Corrosion Revêtements -- Détérioration Revêtements organiques Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : Water transport kinetics in the coatings were markedly enhanced and the coating impedances decreased exponentially as temperature increased. The effect of temperature on the coating impedance was attributed to the change in the defect area fraction caused by the thermal expansion of the polymers. The temperature dependence of coating impedance was reversible in a non-aqueous environment but was irreversible in an aqueous environment. This is attributed to the plasticization effect of water on the polymer chains. The effect of glass transition on coating impedances during a short period of exposure to heat source was insignificant. Note de contenu : - EXPERIMENT : Materials and electrolytes - Differential scanning calorimetry (DSC) - Fourier transform infrared spectroscopy (FTIR) - Water uptake - Electrochemical impedance spectroscopy (EIS) - EIS data analysis - RESULTS : Determination of Tg - Water absorption, desorption, and transport - Effect of water absorption and temperature on polymer chemistry - Effect of temperature on coating resistance and capacitance - Effect of repeated heating and cooling on coating performance DOI : 10.1007/s11998-015-9705-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9705-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24968 [article]

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Recovery of titanium dioxide and other pigments from waste paint by pyrolysis / Mikael C. F. Karlsson in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1111-1122 Titre : Recovery of titanium dioxide and other pigments from waste paint by pyrolysis Type de document : texte imprimé Auteurs : Mikael C. F. Karlsson, Auteur ; Daniel Corr, Auteur ; Christer Forsgren, Auteur ; Britt-Marie Steenari, Auteur Année de publication : 2015 Article en page(s) : p. 1111-1122 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de titane Pigments inorganiques Pyrolyse La pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation. Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente. Récupération (Déchets, etc.) Recyclage (déchets, etc.) Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, a model paint containing several types of inorganic pigments was pyrolyzed in a microwave-heated unit. The goal of the pyrolysis process was to recover and recycle the inorganic components in the paint, most importantly titanium dioxide (TiO2). The solid residue remaining after pyrolysis was further heat treated in air to remove most of the char in the TiO2-containing product. The recovered TiO2-containing product was used in two types of paint formulation as a replacement for virgin pigments. The properties of the paints containing recycled TiO2 pigment and extenders were evaluated and compared with a standard paint formulation containing only virgin TiO2 pigment and virgin extenders. A reduction in paint whiteness was observed but the opacity, gloss, and durability were nearly equivalent to that of the standard paint. Another consequence of using recycled pigments was that the recycled mix of TiO2 pigments and extenders was harder to disperse in the paint than the mix based on virgin materials, thus giving the painted surface a somewhat rough texture. The recycled material has shown promising results as a pigment/extender but further work is needed to optimize the recycled product to meet whiteness and dispersion requirements for incorporation in paint formulations on an industrial scale. Note de contenu : - MATERIALS AND METHODS : White model paint - Methods for characterization of pigments and inorganic recovery residues - Microwave pyrolysis experiments - Evaluation of the properties of a paint based on recycled pigment material - RESULTS AND DISCUSSION : Mineralogy and thermal stability of pigments - Thermal stability of binders - Pyrolysis of the model paint - Oxidative after-treatment of the dry residue from pyrolysis experiment 1 - After-treatment of the dry residue from pyrolysis experiments 2 and 3 - Effect of pyrolysis and oxidative after-treatment on specific surface area DOI : 10.1007/s11998-015-9707-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9707-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24969 [article]

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Comparison and characterization of biocompatible polymer coatings on AISI 316L stainless steel / A. Kocijan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1123-1131 Titre : Comparison and characterization of biocompatible polymer coatings on AISI 316L stainless steel Type de document : texte imprimé Auteurs : A. Kocijan, Auteur ; M. Conradi, Auteur ; Dj. Mandrino, Auteur ; T. Kosec, Auteur Année de publication : 2015 Article en page(s) : p. 1123-1131 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable Analyse électrochimique Angle de contact Anticorrosion Métaux -- Revêtements protecteurs Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Polyéthylène glycol Spectroscopie de photoélectrons Index. décimale : 667.9 Revêtements et enduits Résumé : Polyethylene glycol (PEG)- and polydimethylsiloxane (PDMS)-based corrosion protection coatings of the AISI 316L stainless steel surface were investigated. X-ray photoelectron spectroscopy (XPS) was used to confirm successful deposition of the coatings on the substrate as well as to estimate the thickness for both coating types. Contact angle measurements were used to evaluate wetting properties of noncoated, PEG-coated, and PDMS-coated substrates. Hydrophobicity was achieved by applying PDMS coating on the substrate. Potentiodynamic measurements established enhanced corrosion stability of PEG- and PDMS-coated stainless steels. Electrochemical impedance spectroscopy was also performed. It showed superior corrosion protection vs immersion time dependence for PDMS coating in NaCl solution compared to PEG coating. Note de contenu : - EXPERIMENTAL : Materials - Surface modification - XPS measurements - Contact-angle measurements - The potentiodynamic measurements - RESULTS AND DISCUSSION : XPS measurements - Contact-angle measurements - The potentiodynamic measurements - Electrochemical impedance spectroscopy DOI : 10.1007/s11998-015-9698-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9698-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24970 [article]

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Coating process for antimicrobial textile surfaces derived from a polyester dyeing process / Thomas Grethe in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1133-1141 Titre : Coating process for antimicrobial textile surfaces derived from a polyester dyeing process Type de document : texte imprimé Auteurs : Thomas Grethe, Auteur ; Hajo Haase, Auteur ; Hariharasudan Natarajan, Auteur ; Nadia Limandoko, Auteur ; Boris Mahltig, Auteur Année de publication : 2015 Article en page(s) : p. 1133-1141 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alginates L'acide alginique et ses dérivés (base conjuguée, sels et esters) les alginates sont des polysaccharides obtenus à partir d'une famille d'algues brunes : les laminaires ou les fucus. - COMPOSITION CHIMIQUE : L'alginate est un polymère formé de deux monomères liés ensemble : le mannuronate ou acide mannuronique dont certains sont acétylés et le guluronate ou acide guluronique. L'acide alginique permet la production de fibres d'alginates de sodium et de calcium. Les alginates alcalins forment dans l'eau des solutions colloïdales visqueuses. Si l'acide alginique est insoluble dans l'eau, l'alginate de sodium est lui très soluble dans l'eau, et l'alginate de calcium est seulement soluble en milieu basique, notamment en solutions de savon qui sont presque toujours assez alcalines. Les alginates peuvent former des gels durs et thermostables utilisés comme additifs alimentaires. - UTILISATIONS : Les alginates sont utilisés comme épaississants, gélifiants, émulsifiants et stabilisants de produits industriels les plus variés depuis les gelées alimentaires, les produits de beauté, jusqu'aux peintures et aux encres d'imprimerie. L'alginate de propane-1,2-diol (E405), ester de l'acide aliginique, est utilisé, par exemple, pour stabiliser des mousses (vinification, additif de bière, etc.), et est également utilisé dans un procédé de préparation de microcapsules. Antimicrobiens Hautes températures Ions métalliques Polyesters Sol-gel, Procédé Surfaces (technologie) Textiles et tissus Textiles et tissus -- Finition Index. décimale : 667.9 Revêtements et enduits Résumé : The presented study introduces an approach for coating to realize antimicrobial textile surfaces without the use of nanoscaled metal particles. Bactericidal metal ions were used instead of elementary metal particles and stored in alginates, which were fixed on the textile substrate by a coating application. A newly developed coating process for fixation was conducted which was derived from a polyester dyeing process leading to a significantly higher antimicrobial activity than the application of a common sol–gel coating. For this purpose, a specific coating agent was developed. Antimicrobial testing was done by a viability assay against Escherichia coli and Staphylococcus aureus. The promising results in antibacterial activity could probably in the future lead to useful coating applications for textiles as well as for other polymeric substrates. Note de contenu : - INTRODUCTION : Antimicrobial functions on textile surfaces - Immobilization methods - EXPERIMENTAL : Materials and sample preparation - Analytics - Antimicrobial testing - RESULTS AND DISCUSSION : Modified alginates - High temperature process with nonanoic acid - High temperature process with VTEO, OctEO, and modified alginates - Sol-gel process with TEOS, TEA, and modified alginates DOI : 10.1007/s11998-015-9709-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9709-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24971 [article]

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Facile fabrication of superhydrophobic surface with needle-like microflower structure on aluminum substrate / Yinlong Shi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1143-1151 Titre : Facile fabrication of superhydrophobic surface with needle-like microflower structure on aluminum substrate Type de document : texte imprimé Auteurs : Yinlong Shi, Auteur ; Xinyan Xiao, Auteur ; Weiping Zhang, Auteur Année de publication : 2015 Article en page(s) : p. 1143-1151 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite. L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement. L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium. Hydrophobie Microstructures -- Analyse Surfaces (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : A superhydrophobic surface on aluminum substrate was fabricated by creating a needle-like microflower structure based on a simple hydrothermal synthesis process, and subsequently reducing the surface free energy via the self-assembly of lauric acid. The surface morphology, chemical compositions, and hydrophobicity of the as-prepared films on aluminum substrates were measured using a scanning electron microscope, X-ray powder diffraction, Fourier transform infrared spectroscopy, and water contact angle (WCA) measurements. The optimal hydrothermal synthesis conditions, such as reaction temperature, reaction time, and the concentration of zinc ion, were investigated. In addition, the formation mechanism of the microstructure on aluminum surface was also examined. The results showed the surface of aluminum substrate was endowed with a needle-like microflower structure when hydrothermal synthesis was conducted at 90°C for 2 h with 6 mM of zinc ion concentration. In addition, the as-prepared superhydrophobic aluminum surface has a WCA as high as 154.2° and a sliding angle close to 0°. Note de contenu : - FTIR analysis - XRD analysis - Effect of hydrothermal synthesis conditions on the wettability of aluminum substrate - Effect of hydrothermal synthesis conditions on the microstructure of aluminum substrate - Formation of Zn-Al LDH film on aluminum substrate - Wettability of superhydrophobic aluminum surface DOI : 10.1007/s11998-015-9687-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9687-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24972 [article]

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Doped TiO2 nanophotocatalysts for leather surface finishing with self-cleaning properties / Aurora Petica in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p.1153-1163 Titre : Doped TiO2 nanophotocatalysts for leather surface finishing with self-cleaning properties Type de document : texte imprimé Auteurs : Aurora Petica, Auteur ; Carmen Gaidau, Auteur ; Madalina Ignat, Auteur ; Claudiu Sendrea, Auteur ; Liana Anicai, Auteur Année de publication : 2015 Article en page(s) : p.1153-1163 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Cuirs et peaux -- Finition Dioxyde de titane Hydrophilie Nanoparticules Photocatalyse Revêtement auto-nettoyant Index. décimale : 667.9 Revêtements et enduits Résumé : TiO2 nanoparticles (TiO2NPs) doped with N and Fe, exhibiting improved photocatalytic activity in the visible light region, were prepared and then applied onto leather surfaces. Diffuse reflectance spectra measurements evidenced the shifting of the absorption peak toward visible region and the enlargement of absorption band (the so-called “tail” of the band). Absorbance spectra for a 20 ppm methylene blue (MB) solution, in the presence of 0.1% (wt%) doped TiO2NPs after 1 h under visible light irradiation, showed the high efficiency of the doping. Doped TiO2NPs were embedded in composites material based on acrylic binder, nitrocellulose lacquer, and pigmented paste and were used for leather surface finishing. Self-cleaning properties were confirmed by spectrophotometrical measurements and CIELab color coordinates recording for the degradation of MB spots applied to the treated leather surface exposed to UVA (λ = 365 nm) and visible light irradiation. Leather treated with Fe–N co-doped TiO2NPs presents the highest activity for MB spot degradation under visible light irradiation. The photographic images of MB dye spots and ball pen ink lines indicate a complete degradation after 30 h of exposure to visible light. Water contact angle measurements in dynamic conditions evidenced the photo-induced hydrophilicity process on functionalized leather surface, supporting the degradation phenomena through water and oxidative species generation. Note de contenu : - EXPERIMENTAL : Synthesis of doped titania nanopowders - Leather surface treatment - Characterization methods - RESULTS AND DISCUSSION : Structural and morphological characterization - Optical properties of doped TiO2 nanopowders - Photocatalytic activity of the doped TiO2PNs - Self-cleaning characterization of the treated leather DOI : 10.1007/s11998-015-9711-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9711-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24973 [article]

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Preparation and characterization of triazinedithiol nanofilm on surface of sintered NdFeB permanent magnet / Qin Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1165-1172 Titre : Preparation and characterization of triazinedithiol nanofilm on surface of sintered NdFeB permanent magnet Type de document : texte imprimé Auteurs : Qin Liu, Auteur ; Tingting Zhao, Auteur ; Zhixin Kang, Auteur Année de publication : 2015 Article en page(s) : p. 1165-1172 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces Electrochimie Hydrophobie Nanotechnologie Polymérisation Spectroscopie de photoélectrons Triazinedithiol Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, an organic nanofilm was directly prepared on the metal (sintered NdFeB permanent magnet) surface by electrochemical polymerizing of functional triazinedithiol compound 6-(n-allyl-1,1,2,2-tetrahydroperfluorodecyl) amino-1,3,5-triazine-2,4-dithiol monosodium. The polymeric nanofilm was characterized by spectroscopic ellipsometry, static water contact angle meter, and atomic force microscopy. The chemical progress of electrochemical polymerization was studied by cyclic voltammetry. The film formation mechanism was investigated via X-ray photoelectron spectroscopy and Fourier transform infrared reflection spectroscopy and the results showed that the thiol groups play an important role in polymerization of the film on the substrate. This research may provide a basis for fabricating a triazinedithiol film on metal surfaces and have a promising future for expanding the application of depositing polymer films on metals. Note de contenu : - EXPERIMENTAL : Materials - Electrochemical polymerization - Measurements - RESULTS AND DISCUSSION : Electrochemical reactions during the polymerized process - Characterization of ATP film - Formation mechanism of ATP film DOI : 10.1007/s11998-015-9706-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9706-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24974 [article]

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Enhancing the stability of polystyrene ultrathin films by using star-shape polymers as dewetting inhibitors / Nampueng Pangpaiboon in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1173-1183 Titre : Enhancing the stability of polystyrene ultrathin films by using star-shape polymers as dewetting inhibitors Type de document : texte imprimé Auteurs : Nampueng Pangpaiboon, Auteur ; Rakchart Traiphol, Auteur ; Nisamart Traiphol, Auteur Année de publication : 2015 Article en page(s) : p. 1173-1183 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Additifs Couches minces -- Stabilité Revêtements -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : This contribution introduces a new class of materials for improving the stability of polystyrene (PS) ultrathin films. Two types of three-arm polystyrenes (TA-PS) with different arm lengths are added into PS thin films with thicknesses of 7 and 23 nm. Concentration of the TA-PS additives is varied from 0 to 40 wt%. The morphological change of PS films upon annealing above its glass transition temperature is followed by utilizing optical and atomic force microscopy. Our results show that the addition of TA-PS into PS films leads to significant improvement of the film stability. The dewetting rate of PS film containing only 5 wt% of TA-PS is 3 times slower than that of the pure PS film. The increase of TA-PS concentration results in systematic decrease of the dewetting rate. We also observe that the dewetting-suppression efficiency of the TA-PS depends significantly on its arm length. Note de contenu : - Effects of TA-PS additive on film stability - Effects of TA-PS arm length - Effects of film thickness DOI : 10.1007/s11998-015-9715-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9715-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24975 [article]

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Highly transparent thermal stable silicone/titania hybrids with high refractive index for LED encapsulation / Yamen Lai in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1185-1192 Titre : Highly transparent thermal stable silicone/titania hybrids with high refractive index for LED encapsulation Type de document : texte imprimé Auteurs : Yamen Lai, Auteur ; Lujiang Jin, Auteur ; Jianzhong Hang, Auteur ; Xiaoying Sun, Auteur ; Liyi Shi, Auteur Année de publication : 2015 Article en page(s) : p. 1185-1192 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Conditionnement Diodes électroluminescentes Dioxyde de titane Encapsulation Matériaux hybrides Matériel optique Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Silicone/titania hybrids for LED encapsulation were synthesized via hydrolysis and condensation reaction between tetrabutyl titanate and silica sol containing phenyl groups and long alkyl chains. Crack-free thick films (~1 mm) were fabricated by curtain painting. The hybrid films with different Ti contents were characterized by FTIR, UV–VIS, TGA/DSC, AFM, TEM, ellipsometer, etc. Results show that the hybrid films contain long alkyl chains which have high thermal stability against yellowing owing to the steric hindrance given by long alkyl chains. The hybrid films have high transmittance (≥98% in visible range) and high refractive index (1.591–1.681). In LED encapsulation, the silicone/titania hybrids with an RI of 1.605 increased the light extraction efficiency of bare blue LEDs by 19.4%. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials - Synthesis of silica sol - Synthesis of silica–titania hybrid sols and their films - Measurement and characterization - RESULTS AND DISCUSSION : FTIR spectra of the films - Optical properties of the films - Thermal stability of the films - Micromorphology of the films - LED encapsulation DOI : 10.1007/s11998-015-9681-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9681-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24976 [article]

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