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The effect of formulation variables on fouling-release performance of stratified siloxane-polyurethane coatings / Rajan B. Bodkhe in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 235-249 Titre : The effect of formulation variables on fouling-release performance of stratified siloxane-polyurethane coatings Type de document : texte imprimé Auteurs : Rajan B. Bodkhe, Auteur ; Stephanie E. M. Thompson, Auteur ; Carolyn Yehle, Auteur ; Nicholas Cilz, Auteur ; Justin W. Daniels, Auteur ; Shane J. Stafslien, Auteur ; Maureen E. Callow, Auteur ; James A. Callow, Auteur ; Dean C. Webster, Auteur Année de publication : 2012 Article en page(s) : p. 235-249 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Algues marines Marines (peinture) Polyuréthanes Salissures marines Siloxanes Les siloxanes sont une classe de composés du silicium dont la formule empirique est R2SiO, où R est un groupe radical qui peut être organique. Des exemples représentatifs sont [SiO(CH3)2]n (diméthylsiloxane) et [SiO(C6H5)2]n (diphénylsiloxane), où n est typiquement supérieur à 4. Ces composés peuvent être des hybrides organiques et inorganiques. Les chaînes organiques confèrent au composé des propriétés hydrophobes alors que la chaîne principale -Si-O-Si-O- est purement inorganique. Le mot siloxane est dérivé de Silicium, Oxygène et alkane. Des siloxanes peuvent être trouvés dans des produits tels que des cosmétiques, des déodorants, des enduits hydrophobes pour pare-brise, des peintures et certains savons. Les siloxanes polymérisés (polysiloxanes) sont appelés silicones1,2. Le siloxane est massivement utilisé dans l'industrie cosmétique (rouges à lèvre, conditionneurs et shampooings, déodorants, etc.). Une application récente du Siloxane D5 (2001) a été trouvée dans le nettoyage à sec des textiles en remplacement du perchloroéthylène. Ce procédé est très répandu aux États-Unis et au Royaume-Uni. Il devient de plus en plus courant en Europe continentale dont la France, afin de promouvoir l'usage de procédés écologiques et respectueux de la santé humaine. Index. décimale : 667.9 Revêtements et enduits Résumé : The effects of formulation variables, such as type of polyol, solvent type and solvent content, and coating application method, on the surface properties of siloxane–polyurethane fouling-release coatings were explored. Fouling-release coatings allow the easy removal of marine organisms from a ship’s hull via the application of a shear force to the surface. Self-stratified siloxane–polyurethane coatings are a new approach to a tough fouling-release coating system. Combinatorial High Throughput Experimentation was employed to formulate and characterize 24 different siloxane–polyurethane coatings applied using drawdown and drop-casting methods. The resulting coatings were tested for surface energy using contact angle measurements. The fouling-release performance of the coatings was tested using a number of diverse marine organisms including bacteria (Halomonas pacifica and Cytophaga lytica), sporelings (young plants) of the green macroalga (Ulva linza), diatom ((microalga) Navicula incerta), and barnacle (Amphibalanus amphitrite). The performance of the majority of the coatings was found to be better than the silicone standards, Intersleek® and Silastic® T2. An increase in solvent content in the formulations increased the surface roughness of the coatings. Coatings made with polycaprolactone polyol appeared to be somewhat rougher compared to coatings made with the acrylic polyol. The adhesion strength of sporelings of Ulva increased with an increase in solvent content and increase in surface roughness. The adhesion strengths of Ulva sporelings, C. lytica, and N. incerta were independent of application method (cast or drawdown) in contrast to H. pacifica adhesion, which was dependent on the application method. Note de contenu : - EXPERIMENTAL : Materials - Acrylic polyol synthesis - Synthesis of APT-PDMS (20000 g/mol) - Experimental design- Coating formulation - Coatings application - Water aging - Instrumentation - Biological evaluation : growth and release of Ulva sporelings - Growth and release of Navicula incerta - Bacterial biofilm adhesion - Adult barnacle adhesion - Data analysis DOI : 10.1007/s11998-011-9362-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9362-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15949 [article]

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Critical role of particle/polymer interface in photostability of nano-filled polymeric coatings / Xiaohong Gu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 251-267 Titre : Critical role of particle/polymer interface in photostability of nano-filled polymeric coatings Type de document : texte imprimé Auteurs : Xiaohong Gu, Auteur ; Guodong Chen, Auteur ; Minhua Zhao, Auteur ; Stephanie S. Watson, Auteur ; Tinh Nguyen, Auteur ; Joannie W. Chin, Auteur ; Jonathan W. Martin, Auteur Année de publication : 2012 Article en page(s) : p. 251-267 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais accélérés (technologie) Interfaces (Sciences physiques) Nanoparticules Oxyde de zinc Photodétérioration Polyuréthanes Résistance au rayonnement ultraviolet Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Nanoparticle-filled polymeric coatings have attracted great interest in recent years because the incorporation of nanofillers can significantly enhance the mechanical, electrical, optical, thermal, and antimicrobial properties of coatings. Due to the small size of the fillers, the volume fraction of the nanoparticle/polymer interfacial area in nano-filled systems is drastically increased, and the interfacial region becomes important in the performance of the nano-filled system. However, techniques used for characterizing nanoparticle/polymer interfaces are limited, and thus, the mechanism by which interfacial properties affect the photostability and the long-term performance of nano-filled polymeric coatings is not well understood. In this study, the role of the nanoparticle/polymer interface on the ultraviolet (UV) stability of a nano-ZnO-filled polyurethane (PU) coating system was investigated. The effects of parameters influencing the particle/polymer interfacial properties, such as size, loading, surface modification of the nanoparticles, on photodegradation of ZnO/PU films were evaluated. The nature of the interfacial regions before and after UV exposures were characterized by atomic force microscopy (AFM)-based techniques. Results have shown that the interfacial properties strongly affect chemical, thermo-mechanical, and morphological properties of the UV-exposed ZnO/PU films. By combining tapping mode AFM and novel electric force microscopy (EFM), the particle/polymer interfacial regions have been successfully detected directly from the surface of the ZnO/PU films. Further, our results indicate that ZnO nanoparticles can function as a photocatalyst or a photostabilizer, depending on the UV exposure conditions. A hypothesis is proposed that the polymers in the vicinity of the ZnO/PU interface are preferentially degraded or protected, depending on whether ZnO nanoparticles act as a photocatalyst or a photostabilizer in the polymers. This study clearly demonstrates that the particle/polymer interface plays a critical role in the photostability of nano-filled polymeric coatings. Note de contenu : - EXPERIMENTAL : Materials and specimen preparation - High UV radiant laboratory exposure - Measurements - RESULTS AND DISCUSSION : Thermo-mechanical properties of nano-filled coatings and their relationship with interfacial interactions - Detecting embedded nanoparticle/polymer interface using AFM-based techniques - Role of nanoparticle/polymer interface in photostability of nano-filled polymeric coatings DOI : 10.1007/s11998-011-9326-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9326-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15950 [article]

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Flexible blade coating / A. Jeffrey Giacomin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 269-277 Titre : Flexible blade coating Type de document : texte imprimé Auteurs : A. Jeffrey Giacomin, Auteur ; J. D. Cook, Auteur ; L. M. Johnson, Auteur ; A. W. Mix, Auteur Année de publication : 2012 Article en page(s) : p. 269-277 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Modèles mathématiques Revêtements:Peinture Rhéologie Souplesse (mécanique) Index. décimale : 667.9 Revêtements et enduits Résumé : Flexible blades are often employed to spread liquid coating thinly onto a flat smooth substrate. In this study, we derive a fifth-order nonlinear ordinary differential equation for the thickness of a Newtonian coating and for the corresponding blade deflection. After solving this equation numerically, a graph is produced to help engineers predict the coating thickness. We find that blade deflection and coating thickness are governed by the blade angle and by a new dimensionless group called the blade flexibility. For values of blade flexibility less than one, the coating thickness matches that of a rigid blade. The results of this analysis provide an engineer with the ability to design a flexible blade configuration to deliver the desired coating thickness onto a substrate. DOI : 10.1007/s11998-011-9366-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9366-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15951 [article]

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Application of molecular dynamics computer simulations to evaluate polymer–solvent interactions / Armando Gama Goicochea in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 279-286 Titre : Application of molecular dynamics computer simulations to evaluate polymer–solvent interactions Type de document : texte imprimé Auteurs : Armando Gama Goicochea, Auteur ; Manuel Briseño, Auteur Année de publication : 2012 Article en page(s) : p. 279-286 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymères séquencés Dynamique moléculaire Paramètres de solubilité Polymères -- Solubilité Simulation par ordinateur solvants Index. décimale : 667.9 Revêtements et enduits Résumé : In this article, systematic calculation of the radius of gyration (R g) of a block copolymer immersed in various solvents is presented. Using atomistically detailed, molecular dynamics computer simulations, we carry out the calculation of R g at different polymerization degrees, for each solvent. Our results show that, given a solvent and a polymerization degree, R g can display different values. This aspect is found to be a consequence of the spatial conformation of the constitutive blocks that make up the polymer molecule. Finally, we find that there exists a correlation between R g and the solubility parameter and that the trend in R g predicted by our calculations agrees with previous experimental results. DOI : 10.1007/s11998-011-9364-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9364-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15952 [article]

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Dependent light scattering in white paint films : clarification and application of the theoretical concepts / J.-C. Auger in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 287-295 Titre : Dependent light scattering in white paint films : clarification and application of the theoretical concepts Type de document : texte imprimé Auteurs : J.-C. Auger, Auteur ; Brian Stout, Auteur Année de publication : 2012 Article en page(s) : p. 287-295 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de titane Lumière -- Diffusion Pigments inorganiques Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Among the numerous publications analyzing the causes and consequences of titanium dioxide crowding on the optical properties of white paint films, one notes some inconsistencies. First, a significant number of studies are inclined to describe “dependent” and “multiple” scattering of light as distinct phenomena. Second, the transition from independent to dependent light-scattering is often associated with an ill-defined “threshold” concentration. The aim of this study is to clarify the intricate connections between these two scattering regimes and in particular to show that for white paint films loaded with rutile titanium dioxide pigments, “dependent” light scattering is merely a particular manifestation of multiple scattering processes. We also clarify that the transition from independent to dependent scattering is a continuous process that cannot be formally related to a specific threshold in the pigment volume concentration. Finally, we propose a simple method based on the dependent scattering amplitude to assist paint formulators facing the task of improving the hiding power of a white paint either by increasing the quantity of pigments or by improving their spatial state of dispersion. Note de contenu : - STUDY OF ELECTROMAGNETIC COUPLINGS INVOLVED IN LIGHT-SCATTERING PROCESSES BETWEEN TIO2 PIGMENTS : Previous clafirication - Review of the light propagation models in heterogeneous media - Charaterization of the single-to-multiple scattering transitions - Characterization of the independent-to-dependent scattering transition - Far-field coherent scattering - Evidence of far-field coherent scattering vs near-field interaction via numerical simulations - Partial conclusions - STUDY OF THE DEPENDENT LIGHT-SCATTERING TRANSITION : Description and characterization of dependent scattering transition - Characterization of dependent light-scattering amplitude - PRACTICAL APPLICATION DOI : 10.1007/s11998-011-9371-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9371-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15953 [article]

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Computer rendering and visual detection of orange peel / Jonathan Konieczny in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 297-307 Titre : Computer rendering and visual detection of orange peel Type de document : texte imprimé Auteurs : Jonathan Konieczny, Auteur ; Gary Meyer, Auteur Année de publication : 2012 Article en page(s) : p. 297-307 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Infographie Mesure Revêtements -- Défauts Simulation par ordinateur Index. décimale : 667.9 Revêtements et enduits Résumé : The computer graphic simulation of a common spray painting artifact, called orange peel, is discussed. Orange peel distorts surface reflections and is commonplace in product design applications. The orange peel measurements from a standard industrial instrument are used to construct a height field, and this surface is rendered using traditional normal mapping techniques. Comparisons are made between real panels with orange peel and simulations of those panels. A simple visual model for detecting the presence of orange peel is also presented and evaluated. User testing of the model confirms that orange peel is more visible on dark paint colors than on light paint colors. The latter outcome suggests that to minimize application time, but still keep orange peel below visual threshold, paint application systems should be designed to take paint color into account. Note de contenu : - RELEVANT WORK - DEFINITION AND MEASUREMENT OF ORANGE PEEL - ORANGE PEEL SIMULATION : User interface - Surface construction - Rendering - ORANGE PEEL DETECTION : An analytical model of surface roughness detection - User evaluation DOI : 10.1007/s11998-011-9378-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9378-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15954 [article]

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UV-curable phthalazinone-based epoxy methacrylate antifouling coatings with N-vanillylnonanamide as antifoulant / Jin-Yan Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 309-315 Titre : UV-curable phthalazinone-based epoxy methacrylate antifouling coatings with N-vanillylnonanamide as antifoulant Type de document : texte imprimé Auteurs : Jin-Yan Wang, Auteur ; Ming-Xia Lv, Auteur ; Yan Kou, Auteur ; Qin-Yi Wang, Auteur ; Xi-Gao Jian, Auteur Année de publication : 2012 Article en page(s) : p. 309-315 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes N-vanillylnonanamide Phthalazinone Polyméthacrylates Réticulation (polymérisation) Revêtements -- Séchage sous rayonnement ultraviolet Revêtements antisalissures:Peinture antisalissures Index. décimale : 667.9 Revêtements et enduits Résumé : A UV-curable solvent-free antifouling coating formulated by a novel epoxy methacrylate-containing phthalazinone moiety with reactive diluents and photoinitiator and non-toxic N-vanillylnonanamide as antifoulant was prepared. First, the basic performance of the cured films obtained was evaluated using Chinese National Standards. This environmentally friendly antifouling coating has excellent physical properties, with a pencil hardness of above 5H, an adhesion of grade 1, impact strength above 45 cm, and good resistance to alkali and salt but not acid. Then antifouling evaluation was carried out by the leaching rate of antifoulant, and by immersing samples in natural sea water, respectively. The results from the leaching rate of N-vanillylnonanamide from the antifouling coating shows that the release rate of 45 μg/m2 day of the coating with 15% antifoulant is steady after a slight decrease, and this coating can effectively prevent marine organisms attaching for 6 months, which is also evidenced by field tests in natural sea water. Note de contenu : - EXPERIMENTAL : Materials - Surface preparation of steel panel specimens - Preparation of the UV-curing EMA-P antifoulant coating systems and their cured films - Characterization of the cured films - Performance testing of the cured films - RESULTS AND DISCUSSION : Formulation of the UV-curing EMP-P antifoulant coating systems - Properties of cured films - Antifouling properties of the cured films DOI : 10.1007/s11998-011-9369-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9369-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15961 [article]

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Direct fabrication and morphology of metallic micropatterns by pulsed jet nanoelectrospraying of silver nano-ink / Ke Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 317-322 Titre : Direct fabrication and morphology of metallic micropatterns by pulsed jet nanoelectrospraying of silver nano-ink Type de document : texte imprimé Auteurs : Ke Wang, Auteur ; John P. W. Stark, Auteur Année de publication : 2012 Article en page(s) : p. 317-322 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argent Electronébulisation Encapsulation Encre jet d'encre Nanoparticules Nanotechnologie Surfaces (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : A pulsed jet nanoelectrospray technique was applied to direct fabrication of silver micropatterns. The deposition of a commercial organic silver nano-ink was performed in a fully voltage-controlled fashion by voltage pulses ranging from 550 to 800 V with variable durations. By using 15 μm nozzles, patterns with 100-μm-sized features were locally freeformed on a silicon substrate with a spraying distance of 250 μm. An energy-dispersive X-ray spectrum confirmed metallic silver was developed in all the patterns after heat treatment at 220°C. The size and microstructural evolution of silver films was observed to strongly depend on the deposition volume and material flow over substrate surface. A good linear relationship between the deposition volume and pulse duration was exhibited over the applied voltage range in the cone-jet mode, demonstrating a drop-on-demand capability. By fitting, the deposition volume rate was estimated to be in the range of 0.38–0.59 pL/ms and was shown to increase with the applied voltage. DOI : 10.1007/s11998-011-9370-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9370-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15962 [article]

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Preparation and characterization of water-based polyurethane–acrylic hybrid nanocomposite emulsion based on a new silane-containing acrylic macromonomer / Hamid Javaheriannaghash in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 323-336 Titre : Preparation and characterization of water-based polyurethane–acrylic hybrid nanocomposite emulsion based on a new silane-containing acrylic macromonomer Type de document : texte imprimé Auteurs : Hamid Javaheriannaghash, Auteur ; Nasrin Ghazavi, Auteur Année de publication : 2012 Article en page(s) : p. 323-336 Note générale : Bibliogr. Langues : Américain (ame) Catégories : acrylique, Acide L'acide acrylique ou acide acroléïque ou acide prop-2-énoïque est un composé organique de formule brute C3H4O2 et de formule semi-développée CH2=CHCOOH. C'est un acide carboxylique et un alcène vinylique, et se présente comme un liquide incolore à l'odeur âcre. L'acide acrylique et ses esters, les acrylates, sont utilisés dans la fabrication de matières plastiques, dans les peintures acryliques et dans divers autres polyacryliques qui ont de multiples usages. Anhydride maléique Caractérisation Ethanolamine L'éthanolamine, également appelée 2-aminoéthanol ou monoéthanolamine, est un composé chimique organique qui est à la fois une amine primaire (par son groupe amine) et un alcool primaire (par son groupe hydroxyle). À l'instar des autres amines, la monoéthanolamine se comporte en base faible. L'éthanolamine est un liquide toxique, inflammable, corrosif, incolore et visqueux ; son odeur est similaire à celle de l'ammoniac. Matériaux hybrides Monomères Polyuréthanes Revêtements en phase aqueuse:Peinture en phase aqueuse Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : A new silane-containing acrylic macromonomer, maleimidedoethoxybutoxydimethylsiloxy butyl acrylate (MEBDMSBA), based on maleic anhydride (MA), ethanolamine (EA), 1,4-butanediol (BDO), dichlorodimethylsilane (DCDMS), and acrylic acid (AA) has been synthesized for formulation of waterborne polyurethane (WPU). Also a series of new silane-containing WPU, methyl methacrylate (MMA), MEBDMSBA, and montmorillonite (MMT) with organically modified montmorillonite (OMMT) content (1.25 wt%) hybrid nanocomposites have been successfully prepared by the emulsion polymerization in the presence of a WPU dispersion, using ammonium peroxodisulfate (APS) as an initiator. The WPU dispersion has been synthesized by a polyaddition reaction of isophorone diisocyanate (IPDI) on polypropylene glycol (PPG-1000) and dimethylol propionic acid (DMPA) as chain extender. The monomer was characterized by Fourier transformer infrared spectroscopy (FTIR), elemental analysis, proton (1H NMR), and carbon (13C NMR) nuclear magnetic resonance spectroscopes, respectively. The nanocomposite emulsions were also characterized using Fourier transform infrared spectroscopy (FTIR) and laser light scattering. Thermal properties of the copolymers were studied using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The OMMT was characterized by FTIR and X-ray diffraction (XRD). The morphology of copolymers was investigated by scanning electron microscopy (SEM) and transition electron microscopy (TEM), and then the effects of silane concentrations on the water absorption ratio were examined. Results showed that OMMT could improve the properties of emulsion; in other words, the properties of nanocomposite emulsion were better when compared with those of the silane–acrylate emulsion. Note de contenu : - EXPERIMENTAL : Materials - Preparation of OMMT - Synthesis of bis-hydroxybutoxydimethyl silane (BHBDMS) - Synthesis of an imide ring and silane-containing acrylic macronomer (MEBDMSBA) - Preparation of polyurethane dispersion (PUD) - Semi-continuous emulsions polymerization using polyurethane dispersions - Morphology of P (U/A/Si)/OMMT hybrid emulsion - Film formation - Water absorption - Polymer characterization - RESULTS AND DISCUSSION : Design of MEBDMSBA with silane and imide ring - NMR analysis of MEBDMSBA - FTIR spectra of MMT and OMMT - Distance of MMT and OMMT layers - FTIR spectrum of P (U/A/Si)OMMT nanocomposites - Thermal properties - Morphological characterization of P (U/A), P (U/A/Si), and P (U/A/Si)/OMMT nanocomposites - Effect of MEBDMSBA concentration on reaction rate - Water absorption ratio of the P (U/A/Si)/OMMT nanocomposites DOI : 10.1007/s11998-011-9373-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9373-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15963 [article]

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Surfactant-induced growth of a calcium hydroxide coating at the concrete surface / Eléonore Gueit in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 337-346 Titre : Surfactant-induced growth of a calcium hydroxide coating at the concrete surface Type de document : texte imprimé Auteurs : Eléonore Gueit, Auteur ; Evelyne Darque-Ceretti, Auteur ; Patrick Tintillier, Auteur ; Matthieu Horgnies, Auteur Année de publication : 2012 Article en page(s) : p. 337-346 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chaux Matériaux cimentaires -- Revêtements protecteurs Matériaux hautes performances Surfaces (technologie) Surfactants Index. décimale : 667.9 Revêtements et enduits Résumé : In addition to its remarkable mechanical properties, high-performance concrete (HPC) also exhibits a very smooth surface with low porosity, which makes it particularly suitable for esthetic applications. Unfortunately, the constant environmental aggressions to which the urban buildings are exposed (organic or inorganic particles, algae, micro-organisms, staining from various sources) are a threat to their structural and esthetic durability. This article proposes an innovative method to protect HPC surfaces based on Ca(OH)2 growth at the fresh concrete/formwork interface. With the adequate surfactants used as demolding agents, it is possible to grow a continuous layer of Ca(OH)2 at the concrete surface which closes the porosity, reduces the water uptake, and gives the surface super-hydrophilic properties, facilitating self-cleaning mechanisms. Note de contenu : - MATERIALS AND METHODS : Preparation of mortar samples - Scanning electron microscopy - Image analysis - Water absorption - RESULTS : Influence of the surfactants on the Ca(OH)2 crystals - Influence of the portlandite on mortar surface properties - DISCUSSION : Influence of the surfactants on Ca(OH)2 nucleation - Influence of the surfactants on Ca(OH)2 structure - Influence of the Ca(OH)2 crystals on mortar surface properties DOI : 10.1007/s11998-011-9368-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9368-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15964 [article]

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Chemical and electrochemical characterization of TiO2/Al2O3 atomic layer depositions on AZ-31 magnesium alloy / E. Marin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 347-355 Titre : Chemical and electrochemical characterization of TiO2/Al2O3 atomic layer depositions on AZ-31 magnesium alloy Type de document : texte imprimé Auteurs : E. Marin, Auteur ; A. Lanzutti, Auteur ; L. Guzman, Auteur ; L. Fedrizzi, Auteur Année de publication : 2012 Article en page(s) : p. 347-355 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alumine Anticorrosion Caractérisation Dépôt de couches minces atomiques Magnésium -- Alliages Polarisation (électricité) Revêtement métallique Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, innovative TiO2/Al2O3 mono/multilayers were applied by atomic layer depositions (ALD) on ASTM-AZ-31 magnesium/aluminum alloy to enhance its well-known scarce corrosion resistance. Four different configurations of ALD layers were tested: single TiO2 layer, single Al2O3 layer, Al2O3/TiO2 bilayer and Al2O3/TiO2/Al2O3/TiO2 multilayer deposited using Al[(CH3)]3 (trimethylaluminum, TMA), and TiCl4 and H2O precursors. All depositions were performed at 120°C to obtain an amorphous-like structure of both oxide layers. The four coatings were then investigated using different techniques, such as scanning electron microscope (SEM), stylus profilometer, glow discharge optical emission spectrometry (GDOES) and polarization curves in 0.05-M NaCl solution. The thickness of all the coatings was around 100 nm. The layers compositions were successfully investigated by the GDOES technique, although obtained data seem to be affected by substrate roughness and differences in sputtering rates between ceramic oxides and metallic magnesium alloy. Corrosion resistance showed to be strongly enhanced by the nanometric coatings, giving lower corrosion current densities in 0.05-M NaCl media with respect to the uncoated substrate (from 10−4 to 10−6 A/cm2 for the single layers and from 10−4 to 10−8 A/cm2 for the bi- and multilayers). All polarization curves on coated samples also showed a passive region, wider for the bi-layer (from −0.58 to −0.43 V with respect to Ag/AgCl) and multilayer (from −0.53 to −0.38 V with respect to Ag/AgCl) structures. DOI : 10.1007/s11998-011-9372-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9372-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15965 [article]

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Characterization and property of microarc oxidation coatings on open-cell aluminum foams / Jiaan Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 357-363 Titre : Characterization and property of microarc oxidation coatings on open-cell aluminum foams Type de document : texte imprimé Auteurs : Jiaan Liu, Auteur ; Xianyong Zhu, Auteur ; Zhiqiu Huang, Auteur ; Sirong Yu, Auteur ; Xizhen Yang, Auteur Année de publication : 2012 Article en page(s) : p. 357-363 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite. L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement. L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium. Anticorrosion Caractérisation Mousses (matériaux) Oxydation micro-arc Revêtement de céramique Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : The ceramic coatings were prepared on open-cell aluminum foams by microarc oxidation (MAO) treatment in an alkaline-silicon electrolyte. The morphology, microstructure, elemental distribution, and phase composition of the MAO coatings were investigated by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction, respectively. The corrosion behaviors of the coated and uncoated foams were evaluated by electrochemical polarization measurement. The results show that the MAO coatings cover the surface of open-cell aluminum foams. The coatings were composed of an external porous layer and an internal dense layer. The main phase of the MAO coating phase is γ-Al2O3. The coated aluminum foams exhibit more positive corrosion potential and lower corrosion current density compared with the uncoated aluminum foams. Note de contenu : - Morphologies of the MAO coatings - Phases of the MAO coatings - Electrochemical corrosion test DOI : 10.1007/s11998-011-9377-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9377-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15966 [article]

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Characterization of a water-based paint for corrosion protection / Paula Dias in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 365-374 Titre : Characterization of a water-based paint for corrosion protection Type de document : texte imprimé Auteurs : Paula Dias, Auteur ; Catarina Carneiro, Auteur ; Luísa Andrade, Auteur ; José Sousa, Auteur ; João Machado, Auteur ; Adélio Mendes, Auteur Année de publication : 2012 Article en page(s) : p. 365-374 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Chlorures Ions Matériaux cimentaires -- Revêtements protecteurs Perméabilité Revêtements en phase aqueuse -- Séchage:Peinture en phase aqueuse -- Séchage Index. décimale : 667.9 Revêtements et enduits Résumé : Corrosion of steel rebars in reinforced concrete is one of the major problems in the construction industry. Carbonation reactions of concrete with carbon dioxide and, mainly, the chloride salts action are the main causes responsible for concrete degradation. Protective coatings help to improve the durability of concrete structures by acting as a physical barrier against the corrosion agents. Waterborne paints are usually used for concrete protection rather than solvent-based paints since they are less pollutant. The aim of this work is to investigate the influence of the pore size and porosity on the permeability of the paints films toward sodium chloride. Three characterization methods from membrane science were implemented to characterize paint coatings. The time-lag method was used to determine the permeability toward the sodium chloride and toward helium and argon, these for approximately 100% relative humidity. From the seven waterborne paints formulated, only one was found to be suitable for surface protection of reinforced concrete, since its permeability toward NaCl was smaller than 10−14 m2 s−1, the threshold value required by National Laboratory of Civil Engineering (LNEC) in Portugal. For the formulated paints, it was observed that the average pore size correlates well with the permeability toward sodium chloride. This is an important result since obtaining the permeability toward sodium chloride of corrosion protective paints is very time consuming, while the average pore size can be obtained in a much shorter time. Note de contenu : - EXPERIMENTAL SECTION : Coatings preparation - Application of coatings - Time-lag method : determination of paint films permeability toward chloride salts - Time-lag method : determination of paint films permeability toward gases - Helium picnometry - Mercury porosimetry - RESULTS AND DISCUSSION : Time-lag method - Determination of paint films permeability toward chloride salts - Determination of paint films permeability toward gases - Helium picnometry and mercury porosimetry methods : internal porosimetry determination DOI : 10.1007/s11998-011-9388-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9388-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15967 [article]

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