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Applied rheology and architectural coating performance / Richard R. Eley in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 263-305 Titre : Applied rheology and architectural coating performance Type de document : texte imprimé Auteurs : Richard R. Eley, Auteur Année de publication : 2019 Article en page(s) : p. 263-305 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cisaillement (mécanique) Floculation Latex Microstructures Particules (matières) Revêtements en bâtiment:Peinture en bâtiment Rhéologie Sédimentation Index. décimale : 667.9 Revêtements et enduits Résumé : Paint rheology is understood to play a vital role in both product performance and customer acceptance. Consequently, the ability to formulate paints having the necessary flow properties is essential for paint technologists. Experienced formulators have said that as much as half the cost of new product development can be consumed in getting the rheology right. In fact, the quality-control viscosity measurement devices in everyday use in the development laboratory are of little help in this endeavor. Among other shortcomings, most such instruments apply shear stresses which are far from those involved in important coating flow processes. The rheological properties required for a successful coating must be defined with due regard to the prevailing conditions of stress involved in application and film formation. This requires that measurements should be taken over a wide range of shear stress and timescales. The task for the applied rheologist is to bridge rheology and technology, but it is often unclear how to connect rheological data with the “real-world” performance of paints, due to the complexity of coating flows. This review in part discusses the use of controlled-stress rheometry to characterize coatings, and presents ways of applying the results effectively to the analysis of paint flow. The methodology is fundamental but not unduly time-consuming, since the objective is to provide sound yet timely guidance to formulators. Thirteen commercial semigloss latex paints were analyzed rheologically to develop correlations to paint performance. Using the method of shear stress mapping, key regions of the non-equilibrium flow curve are identified for the control of paint flow processes. With this approach, simple but strong correlations were obtained of paint flow metrics to viscosity chosen at the relevant stresses. The fact of high correlation means one can expect that an appropriate viscosity adjustment will correspondingly improve performance. It is argued that shear stress, not shear rate, is the correct independent variable both for experimentation and for the graphical presentation and analysis of viscosity data. The yield stress parameter, particle flocculation, and sedimentation are also discussed, and an oscillatory shear method of direct measurement of yield stress is described. Note de contenu : - BASIC RHEOLOGY TERMS AND DEFINITIONS - RHEOLOGY AND COATING FLOWS : Correlations of rheology to performance - Shear rate or shear stress ? - Shear rate or shear stress : experimental aspects - Equilibrium flow methods - Step-shear thixotropic recovery method - The non-equilibrium flow curve - Graphical representation of flow curves - Shear stress mapping - Leveling - Sagging (drainage flow) - Rheology and initial film geometry - Hydrodynamics of brush and roller application - - YIELD STRESS : Yield stress measurement - Yield stress and coating flows - Yield stress and particle settling DOI : 10.1007/s11998-019-00187-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00187-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32405 [article]

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A review on protective polymeric coatings for marine applications / Shatakshi Verma in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 307-338 Titre : A review on protective polymeric coatings for marine applications Type de document : texte imprimé Auteurs : Shatakshi Verma, Auteur ; Smita Mohanty, Auteur ; Sanjay K. Nayak, Auteur Année de publication : 2019 Article en page(s) : p. 307-338 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Epoxydes Marines (peinture) 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. Revêtements antisalissures:Peinture antisalissures Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : The main objective of this review is to discuss the recent research on polymer-based surface coatings contributing to the protection against marine biofouling based on the knowledge available in literature, supplemented by means of figures, mechanism illustrations, mathematical models, and equations. A need for studies on the mathematical behavior of such coatings is emphasized, composed of quantitative evaluation of foul-release performance of coatings using mathematical equations of the concerned parameters. Apart from the synthesis of protective polymeric coatings, understanding the relationship between characteristics of coating materials and accompanying foul-release and antifouling mechanism is important. In this regard, efforts have been made to equally evaluate, simulate, and measure the appropriate performance of the coatings. By examining the physicochemical and mechanical properties of the polymers, adhesion behavior has been found to be one of the prerequisites for the success of polymeric coatings for marine applications. The potential development of a broad spectrum of methods used to evaluate the foul-release performance of polymeric coatings depending on adhesion behavior of fouling organisms with the coatings has been discussed. From the analysis of the factors affecting degradation of coatings, environmental interference is declared a key factor for complete degradation of polymeric coatings. This review opens up new research directions to improve the adhesion performance of polymeric coatings for ship hulls designed with tunable viscoelasticity by the incorporation of elastomeric polymers (like polydimethylsiloxane) into stiff polymers (like epoxy resins) with and without the utilization of additives, modifiers, and nano-fillers. In addition, it provides methods to improve the foul-release performance of such coatings that work on adhesion behavior of biofouling species attached to the coating surface. Note de contenu : - POLYMERIC COATINGS FOR MARINE APPLICATIONS : Superhydrophic coatings - Antifouling coatings - Foul-release coatings - NONFOULING TECHNOLOGY BASED ON (EPOXY RESINS-PDMS) Hybrids : Nonfouling (epoxy resin-PDMS)-unfilled coating systems - ROLE OF FILLERS AND ADDITIVES IN PDMS-BASED COATINGS : Mathematical evaluation of foul-release performance DOI : 10.1007/s11998-018-00174-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00174-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32406 [article]

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Critical view on the possibility of color changes prediction in the surfaces of painted wood exposed outdoors using accelerated weathering in Xenotest / Milos Panek in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 339-352 Titre : Critical view on the possibility of color changes prediction in the surfaces of painted wood exposed outdoors using accelerated weathering in Xenotest Type de document : texte imprimé Auteurs : Milos Panek, Auteur ; Ladislav Reinprecht, Auteur Année de publication : 2019 Article en page(s) : p. 339-352 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs Climat Couleur Décoloration Essais accélérés (technologie) Microscopie Statistique Index. décimale : 667.9 Revêtements et enduits Résumé : The capability to correlate exactly the process of outdoor natural weathering for the coating systems on wood surfaces via their artificial weathering in laboratory conditions would significantly reduce the testing times. In this work, a weathering of 16 different coating systems applied on two wood species (Norway spruce and black locust) having two different degrees of roughness (smooth, rough) was performed with the aim to compare direction and intensity of their color changes in natural exterior exposure without ground contact lasting from 6 to 36 months and in Xenotest lasting from 1 to 12 weeks, respectively. Correlation relationships between the natural and accelerated weathering of painted woods have been evaluated based on linear regressions for changing of the CIE-L*a*b* color parameters ΔL* and ΔE* and by non-linear Spearman rank correlation of ΔE* values. The results exhibit better possibilities for correlating the color changes for wood painted with pigmented coatings compared to transparent ones. The precision of the employed correlations has also been affected by the underlying wood species and its roughness before application of the coating. This means that, in the modeling of painted wood weathering, it is necessary to take into account a number of other factors in addition to the specific climatic conditions of exposure. Note de contenu : - Wood samples - Coatings systems - Natural and accelerated weathering - Color analyses - Microscopic analyses - Statistical evaluation DOI : 10.1007/s11998-018-0125-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0125-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32407 [article]

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Low-viscosity UV-curable polyurethane acrylates containing dendritic acrylates for coating metal sheets / Woo-Chan Choi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 377-385 Titre : Low-viscosity UV-curable polyurethane acrylates containing dendritic acrylates for coating metal sheets Type de document : texte imprimé Auteurs : Woo-Chan Choi ; Won-Ki Lee ; Chang-Sik Ha Année de publication : 2019 Article en page(s) : p. 377-385 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique Caractérisation Copolymère uréthane acrylate Dendrimères Un dendrimère 1,2est une molécule dont la forme reprend celle des branches d'un arbre. Le nom vient du grec "δενδρον"/dendron, signifiant "arbre". En 1979, le premier dendrimère a été synthétisé par D.A. Tomalia3 et d'autres chercheurs de la Dow Chemical Company, et des dendrimères ont depuis été étudiés partout dans le monde pour leur forme unique. Dans la synthèse des dendrimères, les monomères mènent à un polymère monodisperse, tel un arbre4. Il y a deux méthodes définies de synthèse des dendrimères: synthèse divergente5,6 et synthèse convergente7. La première assemble la molécule du noyau jusqu'à la périphérie et le second de l'extérieur vers le noyau. Les propriétés des dendrimères sont engendrées par les structures moléculaires présentes sur sa surface. Par exemple, un dendrimère peut être hydrosoluble quand son extrémité-groupe est un groupe hydrophile, comme un groupe carboxylique. Il est théoriquement possible de concevoir un dendrimère hydrosoluble avec l'hydrophobicité interne, qui lui permettrait de porter un composé hydrophobe dans son intérieur (afin de transporter un composé thérapeutique hydrophobe dans le sang par exemple). Une autre propriété est que le volume d'un dendrimère augmente quand il a une charge positive. Si cette propriété peut être appliquée, des dendrimères peuvent être employés pour les systèmes de transport d'éléments chimiques qui peuvent donner le médicament à la partie visée à l'intérieur du corps d'un patient directement (tumeur par exemple). Les applications sont très diverses comme un élément organique électroluminescent, comme substitut sanguin, traitement anti-cancer, outils pour la multiplication de cellules, mais aussi en matériaux lors d'associations avec des nanotubes ou comme sondes sélectives et efficaces. Dépôt par pulvérisation Essai de dureté Fourier, Spectroscopie infrarouge à transformée de Métaux -- Revêtements Modèles numériques Revêtements -- Séchage sous rayonnement ultraviolet Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : To develop environmentally friendly coating materials with good workability, a low-viscosity polyurethane acrylate (LPUA) was newly synthesized using cycloaliphatic isocyanate, 2-hydroxypropyl acrylate and caprolactone hydroxyl acrylate. Low-viscosity UV-curable dendritic polyurethane acrylate coatings (LPUA-DAs) were then prepared by adding different amounts of dendritic acrylates to LPUA. The viscosity of the resulting products, curing behavior, mechanical and thermal stability, hardness, and flexibility of the UV-cured films were examined. The mechanical properties and the glass transition temperature increased with increasing content of dendritic acrylates but the viscosity decreased. The optimal properties of the coating materials were observed when 10% of dendritic acrylate was used. Note de contenu : - FTIR spectra - Viscosity - Curing behavior - Dynamic mechanical analysis - Pendulum hardness - TGA - Characterization of coating films DOI : 10.1007/s11998-018-0117-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0117-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32408 [article]

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Improving the wettability and antiprotein adsorption property of PDMS by swelling–deswelling approach / Xue-Ke Xia in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 353-361 Titre : Improving the wettability and antiprotein adsorption property of PDMS by swelling–deswelling approach Type de document : texte imprimé Auteurs : Xue-Ke Xia, Auteur ; Xiao-Hong Wang, Auteur ; Wei Zhang, Auteur ; Xue-Lian Han, Auteur ; Ping Chen, Auteur ; Yong Jiang, Auteur Année de publication : 2019 Article en page(s) : p. 353-361 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption Angle de contact Caractérisation Chimie des surfaces Heptaméthyltrisiloxane Microscopie à force atomique Mouillabilité 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. Polymères -- Propriétés optiques Réfraction, Indice de Revêtements -- Propriétés mécaniques Spectroscopie de photoélectrons Surfactants Toxicologie cellulaire Transmittance La transmittance, en général, est le rapport caractérisant la transmission d'une grandeur dans un système. Elle se calcule par le rapport entre la grandeur en entrée et en sortie. En optique, la transmittance d'un matériau ou d'un filtre est la fraction du flux lumineux le traversant. Elle est également nommée facteur de transmission mais aussi transparence dans le domaine de la photographie. Index. décimale : 667.9 Revêtements et enduits Résumé : In order to improve the wettability and antiprotein adsorption property of PDMS, heptamethyltrisiloxane (a well-known superspreader) was coated onto the PDMS substrates by a swelling–deswelling process. PDMS films were first immersed in heptamethyltrisiloxane solution mixtures to coat heptamethyltrisiloxane onto PDMS. During the deswelling process, the hydrophobic siloxane group of the superspreader heptamethyltrisiloxane was trapped in the PDMS matrix, while the hydrophilic group EO was exposed to the surface. In this manner, heptamethyltrisiloxane was finally coated on the PDMS surface via swelling–deswelling process. Contact angle measurements, optical property analyses, X-ray photoelectron spectroscopy, and atomic force microscopy were used to confirm that durable hydrophilic and transparent PDMS surfaces were successfully obtained. The PDMS surface wettability could be adjusted by tuning the solubility parameters of the solution mixture. Additionally, antiprotein adsorption property was investigated and the result indicated the heptamethyltrisiloxane was tethered onto the PDMS surface. The swelling–deswelling method can be applied for the modification of other crosslinked polymers to obtain antifouling surfaces and functional materials for biomedical applications. Note de contenu : - EXPERIMENTAL SECTION : Materials - Fabrication of PDMS films - Swelling-deswelling process of PDMS - Contact angle measurement - Mechanical properties - Refractive index and light transmittance measurements - X-ray photoelectron spectroscopy (XPS) - Atomic force microscopy (AFM) measurements - Protein adsorption test - MTT cytotoxicity - RESULTS AND DISCUSSION : Swelling of PDMS - Contact angle and long-term stability - Optical and mechanical properties of modified PDMS - Surfact characterization - Protein adsorption and cell compatibility DOI : 10.1007/s11998-018-0070-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0070-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32409 [article]

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Numerical modeling of the spray coating of spinning bodies / D. E. Weidner in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 363-376 Titre : Numerical modeling of the spray coating of spinning bodies Type de document : texte imprimé Auteurs : D. E. Weidner, Auteur ; Leonard W. Schwartz, Auteur ; Richard R. Eley, Auteur Année de publication : 2019 Article en page(s) : p. 363-376 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dépôt par pulvérisation Modèles numériques Revêtement par centrifugation Index. décimale : 667.9 Revêtements et enduits Résumé : We derive the lubrication form of the fluid mechanical equations governing the motion of a thin liquid film on an arbitrarily curved, rotating, axisymmetric substrate. The resulting equations are discretized and then solved numerically using an efficient implicit finite difference algorithm. Non-Newtonian effects are included by incorporating an Ellis viscosity model. The primary application for this work is to model the spin coating of the interior of two-piece metal beverage cans, and we consider this problem in some depth. Specifically, we show how adjusting several parameters can eliminate one possible defect in the spin coating process: the tendency for droplets to detach from the substrate when the can is spun at high rotation rates. Note de contenu : - Previous work - Derivation of equations - Nondimensionalization - Numerical aspects - Applications - Conclusion - Appendix 1 : Application of coating layer - Appentix 2 : Calculating the height of a pendant drop of maximum volume DOI : 10.1007/s11998-018-0131-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0131-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32410 [article]

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Synthesis and characterization of castor oil-based branched polyols from renewable resources and their polyurethane-urea coatings / Allauddin Shaik in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 387-400 Titre : Synthesis and characterization of castor oil-based branched polyols from renewable resources and their polyurethane-urea coatings Type de document : texte imprimé Auteurs : Allauddin Shaik, Auteur ; Kabir Baidya, Auteur ; Kirankumar M. Nehete, Auteur ; Subarna Shyamroy, Auteur Année de publication : 2019 Article en page(s) : p. 387-400 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anhydride succinique Caractérisation Copolymère uréthane-urée Gonflement (physique) Huile de ricin et constituants Polymères -- Synthèse Polymères ramifiés Polyols Polyuréthanes Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : The chemical modifications of castor oil (CO) to develop branched polyols and their polyurethane-urea coatings have been investigated. For this purpose, castor oil-based branched polyols (COBPs) were synthesized from CO by modifying with succinic anhydride followed by reaction with hydroxyl group moieties like petrochemical-based pentaerythritol, trimethylolpropane and bio-based glycerol. The COBPs were characterized by using Fourier transform infrared, 1H and 13C nuclear magnetic resonance spectroscopies, gel permeation chromatography and differential scanning calorimetry. These COBPs were further urethanized with isophorone diisocyanate at OH/NCO ratio of 1:1.6 to get the isocyanate-terminated polyurethane prepolymers. The surplus isocyanate groups of the prepolymer were cured with atmospheric moisture at ambient temperature condition to form uniform film with fast surface drying. The thermo-mechanical, viscoelastic and swelling properties were evaluated for the cured coating films. Properties have been discussed from the viewpoint of branched network and also the urethane segment present in the structure. The glass transition temperatures of the coating films were found to be in the range of 32–64°C. The modified castor oil coating films show better thermo-mechanical and viscoelastic properties in comparison with control (unmodified castor oil) coating films. This work delivers an effective and promising way to synthesize branched moieties in plant oil-based high performance coatings. Note de contenu : - EXPERIMENTAL SECTION : Materials - METHODS : Synthesis of acid-terminated castor oil (COSA) - Synthesis of castor oil-based branched polyols (COBPs) - CHARACTERIZATION : Structural analysis of CO, COSA and COBPs - Drying time - DMA analysis - Swelling properties - TGA analysis DOI : 10.1007/s11998-018-0118-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0118-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32411 [article]

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Influence of novel ammonium-modified zinc-free phosphate nanofillers on anticorrosive features of primer-less polyurethane top-coating compositions / Krzysztof Kowalzczyk in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 401-414 Titre : Influence of novel ammonium-modified zinc-free phosphate nanofillers on anticorrosive features of primer-less polyurethane top-coating compositions Type de document : texte imprimé Auteurs : Krzysztof Kowalzczyk, Auteur ; Katarzyna Przywecka, Auteur ; Barbara Grzmil, Auteur Année de publication : 2019 Article en page(s) : p. 401-414 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Electrochimie Essais de brouillard salin Nanoparticules Phosphate d'aluminium Le phosphate d'ammonium est un composé chimique de formule (NH4)3PO4. Il s'agit d'un sel d'ammoniac NH3 et d'acide phosphorique H3PO4, constitué de cations ammonium NH4+ et d'anions phosphate PO43–. Il se forme à l'état de poudre cristalline lorsqu'on mélange deux solutions concentrées d'ammoniac et d'acide phosphorique : 3 NH3 + H3PO4 → (NH4)3PO4. Il est soluble dans l'eau, et la solution aqueuse de phosphate d'ammonium libère de l'ammoniac lorsqu'on la chauffe. Les autres sels d'ammoniac et d'acide phosphorique existent également : phosphate de diammonium (NH4)2HPO4 et phosphate de monoammonium NH4H2PO4. Ils peuvent être convertis l'un en l'autre avec le phosphate d'ammonium en ajoutant davantage d'ammoniac ou d'acide phosphorique selon les besoins. Le phosphate d'ammonium est utilisé dans certains engrais comme source d'azote. Il est également employé comme retardateur de flamme dans la composition des thermoplastiques. Phosphate d'ammonium Phosphate de calcium Phosphate de strontium Phosphate de zinc Polyuréthanes Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Anticorrosive polyurethane coating compositions were compounded using novel zinc-free nanosized phosphates: aluminum ammonium phosphates (AAP) or calcium aluminum ammonium phosphates (CAAP). For comparison, a nanosized strontium phosphate (SP), AAP/SP mixtures, and a microsized zinc phosphate (ZP) were tested. Paints containing ammonium-modified phosphates exhibited similar or a slightly higher viscosity than systems with SP or ZP. Nevertheless, coatings with the AAP or CAAP reached significantly better gloss and adhesion to a steel substrate as well as a slightly higher hardness. Results of a salt spray test showed that anticorrosive properties of the coatings containing AAP/SP mixtures were markedly better in relation to the systems containing solely AAP, CAAP, SP, or ZP. Electrochemical tests revealed the best barrier/anticorrosive features for AAP (electrochemical impedance spectroscopy and potentiodynamic polarization) or SP and CAAP (a novel electrochemical noise technique). Note de contenu : - Preparation of the anticorrosive polyurethane paints - Test methods DOI : 10.1007/s11998-018-0119-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0119-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32412 [article]

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Castor oil-based waterborne hyperbranched polyurethane acrylate emulsion for UV-curable coatings with excellent chemical resistance and high hardness / Daidong Wei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 415-428 Titre : Castor oil-based waterborne hyperbranched polyurethane acrylate emulsion for UV-curable coatings with excellent chemical resistance and high hardness Type de document : texte imprimé Auteurs : Daidong Wei, Auteur ; Bing Liao, Auteur ; Qiwen Yong, Auteur ; Huiyi Wang, Auteur ; Tao Li, Auteur ; Jianheng Huang, Auteur ; Hao Pang, Auteur Année de publication : 2019 Article en page(s) : p. 415-428 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymère uréthane acrylate Dureté (matériaux) Formulation (Génie chimique) Huile de ricin et constituants Humidité -- Absorption:Eau -- Absorption Polyesters Polymères -- Synthèse Polymères en émulsion Résistance chimique Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Revêtements -- Séchage sous rayonnement ultraviolet Revêtements en phase aqueuse Rhéologie Transparence (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : Synthesis, characterization, and coating performance of castor oil (CO)-based waterborne hyperbranched polyurethane acrylate (WHPUA) emulsions are highlighted in this work. Herein, a second-generation CO-based hyperbranched polyester (C20) was synthesized by introducing the renewable CO as a B3 core and dimethylolpropionic acid as an AB2 monomer via a pseudo-one-pot condensation procedure. Three types of CO-based WHPUA emulsions were prepared through the addition of the hyperbranched C20 with maleic anhydride (MA) and the isocyanate-bearing semiadduct (IPDI-HEA) at different MA/IPDI-IH molar ratios without the addition of any emulsifiers. The prepared emulsions were further formulated into UV-curable coating formulations and exposed to a medium-pressure mercury lamp. Consequently, the obtained UV-cured coatings exhibited outstanding adhesion performance, excellent transparency, and an acceptable degree of final double bond conversion. Owing to a relatively low concentration of hydrophilic units and a large number of acrylate functionalities in the waterborne oligomer, the obtained films were endowed with high crosslinking density and low hydrophilic nature, thus producing enhanced tensile strength, pencil hardness, water resistance, and chemical resistance. Due to their combination of renewable materials, a waterborne system and a UV-curing technique, these CO-based WHPUA emulsions offer promising opportunities to be used as environmentally friendly coatings. Note de contenu : - EXPERIMENTAL : Materials - Materials - Synthesis of the second-generation hyperbranched polyester (C20) - Synthesis of the CO-based WHPUA emulsions (WCM&.5I8.5s WCM2I88, and WCM2.4I7.5) - UV-curable coating formulations and UV-curing - Characterization - RESULTS AND DISCUSSION : Synthesis and structure characterization - Appearance, stability, viscosity, and particle diameter distribution - Rheological behavior - Curing kinetics and boule bond conserson - Mechanical properties and performance of the UV-cured coatings - Gel content and water absortion of the UV-cured films - Chemical resistance of the UV-cured films - Thermal properties and transparency of the UV-cured films - COMPLIANCE WITH ETHICAL STANDARDS DOI : 10.1007/s11998-018-0120-1 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32413 [article]

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UV-cured organic–inorganic hybrid moisture barrier materials based on polybutadiene dimethacrylate / Sahohui Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 429-437 Titre : UV-cured organic–inorganic hybrid moisture barrier materials based on polybutadiene dimethacrylate Type de document : texte imprimé Auteurs : Sahohui Liu, Auteur ; Ya Wu, Auteur ; Jun Nie, Auteur ; Yong He, Auteur Année de publication : 2019 Article en page(s) : p. 429-437 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ammoniums quaternaires Caractérisation Montmorillonite Photoréticulation Résistance à l'humidité Revêtements -- Séchage sous rayonnement ultraviolet Revêtements protecteurs Sodium Le sodium est un élément chimique, de symbole Na et de numéro atomique 11. C'est un métal mou et argenté, qui appartient aux métaux alcalins. On ne le trouve pas à l'état de corps pur dans la nature, mais il est très abondant sous forme de composés, par exemple dans le sel. Il brûle avec une flamme jaune. Le sodium possède 22 isotopes connus, avec un nombre de masse variant entre 18 et 37. Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, a synthesized polymerizable quaternary ammonium salt (PQAS-18) was intercalated into inorganic sodium montmorillonite (Na-MMT) as an organic modifier via cationic exchange. Afterward, a novel organic–inorganic hybrid material was prepared through in situ UV-curing technology and combined with a polymer matrix based on polybutadiene dimethacrylate (PBDMA). PQAS-18 fixed the crosslinked network due to its double bond, thereby leading to firm bonding between the polymer matrix and organoclay; moreover, our study showed homogeneous dispersion of the lamellar structure in the polymer matrix. X-ray diffraction proved that the distance between Na-MMT layers increased, and water vapor transmission measurement showed that the moisture barrier property of cured hybrid film was remarkably improved. Note de contenu : - Materials - Preparation of organoclay - Preparation of the organic-inorganic hybrid films - Characterization DOI : 10.1007/s11998-018-0121-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0121-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32414 [article]

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Investigation of substituent effect on cool activity of perylene bisimide pigments / Fahimeh Mahmoudi Meymand in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 439-447 Titre : Investigation of substituent effect on cool activity of perylene bisimide pigments Type de document : texte imprimé Auteurs : Fahimeh Mahmoudi Meymand, Auteur ; Majid Mazhar, Auteur ; Majid Abdous, Auteur Année de publication : 2019 Article en page(s) : p. 439-447 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Pérylène bisimide Pigments Rayonnement infrarouge Réflectance Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, some derivatives of perylene bisimides are successfully synthesized and characterized using FTIR, HNMR and XRD techniques. In addition, their UV–Vis–NIR reflectance spectra are investigated. Synthesized pigments were planned to have high structural similarities as all of them were N,N′-diphenyl-3,4,9,10-perylenedicarboximide derivatives. The substituents are selected from two categories including activating groups and deactivating ones. The correlation between substituent electronic properties and NIR features of the synthesized pigments is investigated, while the data of three previously synthesized derivatives are included. The results have revealed interesting approximate correlation between NIR properties and electronic features of the substituents. Electronically activating groups reduce the reflectance values (on white substrate) of the pigments in comparison with nonsubstituted molecule, while deactivating ones increase the reflectance amount. This result can be a starting point for detailed studying of structure–NIR properties correlation in perylene pigments. Crystallinity (%) of the pigments is estimated using XRD patterns, and the probable correlation of this parameter with NIR properties of the pigments is investigated, and no meaningful correlation is detected. All the pigments are NIR-transparent and subsequently are capable to be used as cool pigments. Note de contenu : - EXPERIMENTAL : Materials - Instruments - General procedure for the synthesis of perylene derivatives - Paint preparation an substrate selection - RESULTS AND DISCUSSION : PBIs characterizations - UV-Vis-NIR reflectance spectra - X-ray diffraction (XRD) DOI : 10.1007/s11998-018-0122-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0122-z Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32415 [article]

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The influence of the structural features of lignin-based polyurethane coatings on ammonium sulfate release: kinetics and thermodynamics of the process / Francisco Averlino ; Isabela Pires Miranda ; Taina Danas Moreira ; Helena Becker ; Francisco Belmino Morero ; Carlos Alberto Kenji Taniguchi ; Selma Elaine Mazzetto ; Filho de Sa Moreira de Souza in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 449-463 Titre : The influence of the structural features of lignin-based polyurethane coatings on ammonium sulfate release: kinetics and thermodynamics of the process Type de document : texte imprimé Auteurs : Francisco Averlino, Auteur ; Isabela Pires Miranda, Auteur ; Taina Danas Moreira, Auteur ; Helena Becker, Auteur ; Francisco Belmino Morero, Auteur ; Carlos Alberto Kenji Taniguchi, Auteur ; Selma Elaine Mazzetto, Auteur ; Filho de Sa Moreira de Souza, Auteur Année de publication : 2019 Article en page(s) : p. 449-463 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux Engrais organiques Lignine La lignine est un des principaux composants du bois, avec la cellulose, l'hémicellulose et des matières extractibles. La lignine est présente principalement dans les plantes vasculaires et dans quelques algues. Ses principales fonctions sont d'apporter de la rigidité, une imperméabilité à l'eau et une grande résistance à la décomposition. Toutes les plantes vasculaires, ligneuses et herbacées, fabriquent de la lignine. Quantitativement, la teneur en lignine est de 3 à 5 % dans les feuilles, 5 à 20 % dans les tiges herbacées, 15 à 35 % dans les tiges ligneuses. Elle est moindre pour les plantes annuelles que pour les vivaces, elle est maximum chez les arbres. La lignine est principalement localisée entre les cellules (voir parois pectocellulosiques), mais on en trouve une quantité significative à l'intérieur même de celles-ci. Bien que la lignine soit un réseau tridimensionnel hydrophobe complexe, l'unité de base se résume essentiellement à une unité de phénylpropane. La lignine est le deuxième biopolymère renouvelable le plus abondant sur la Terre, après la cellulose, et, à elles deux, elles cumulent plus de 70 % de la biomasse totale. C'est pourquoi elle fait l'objet de recherches en vue de valorisations autres que ses utilisations actuelles en bois d'œuvre et en combustible. Voie de biosynthèse : La lignine est une molécule dont le précurseur est la phénylalanine. Cet acide aminé va subir une cascade de réactions faisant intervenir une dizaine de familles d'enzymes différentes afin de former des monolignols. Ces enzymes sont : phénylalanine ammonia-lyase (PAL), cinnamate 4-hydroxylase (C4H), 4-coumarate:CoA ligase (4CL), hydroxycinnamoyl-CoA shikimate/quinate hydroxycinnamoyl transferase (HCT), p-coumarate 3-hydroxylase (C3H), caffeoyl-CoA o-methyltransferase (CCoAOMT), cinnamoyl-CoA reductase (CCR), ferrulate 5-hydroxylase (F5H), caffeic acid O-methyltransferase (COMT) et cinnamyl alcohol deshydrogenase (CAD). Dans un certain nombre de cas, des aldéhydes peuvent également être incorporés dans le polymère. Noix de coco et constituants Polymérisation Polyuréthanes Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The influence of the properties of lignin-based polyurethane (PU) coatings on the release behavior of ammonium sulfate was assessed through complete physicochemical, structural, and morphological characterization. The influence of the release medium was evaluated as well. The higher the amount of lignin in the coatings was, the lower the pore diameter and swelling degree and the higher crosslinking were. The hydrophobicity of coatings was not significantly changed by increasing the lignin content. However, the opposite behavior was observed for their biodegradability. The results of the nutrient release experiments showed that the two formulations of lignin-based PUs had very similar behavior in terms of release rates of NH4+ and SO42− in both release media, despite their different properties. However, there was a difference between their release rate constants obtained by using three different kinetic models. In addition, both PU coatings released a higher amount of SO42− than NH4+ in both media. The thermodynamic data suggest that dissolution and release processes for SO42− are more spontaneous than that for NH4+. Nevertheless, both coatings behaved in accordance with CEN standards for CRF systems, representing a potential technique for agricultural applications. Note de contenu : - MATERIALS AND METHODS : Materials and chemicals - Lignin extraction from CSP by the ethanosolv method - Preparation of lignin-based polyurethane-coated ammonum sulfate (PCAS) - Characterization of CSEL-based polyurethane coatings - Biodegradability assay of PUs A and B by soil burial - Release assays of (NH4)2SO4 in water and in water-saturated sans columns - RESULTS AND DISCUSSION Characterization of lignin-based polyurethane coatings - Biodegradability assay of PUs A and B with soil burial - Release aspects of (NH4)2SO4 in wter and water-saturated sand columns DOI : 10.1007/s11998-018-0123-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0123-y Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32416 [article]

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UV-curable alkyd coating with self-healing ability / Saman Nornadila Mohd in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 465-476 Titre : UV-curable alkyd coating with self-healing ability Type de document : texte imprimé Auteurs : Saman Nornadila Mohd, Auteur ; Desmond Teck-Chye Ang, Auteur ; Nurshafiza Shahabudin, Auteur ; Seng Neon Gan, Auteur ; Wan Jefrey Basirun, Auteur Année de publication : 2019 Article en page(s) : p. 465-476 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Caractérisation Encapsulation Huile de palme et constituants Pentaérythritol tétrakis Polyalkydes Polymères -- Synthèse Revêtement autoréparant Revêtements -- Séchage sous rayonnement ultraviolet Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : UV-curable palm oil-based alkyd coating is a form of environmentally friendly coating that utilizes vegetable oil as one of its main raw materials. Similar to any other coatings, UV-cured alkyd coating is susceptible to damages such as formation of microcracks during its service. Early diagnosis and repair of the damage are important to avoid further catastrophic failure and damage to the substrate. Self-healing ability in coating is therefore a desirable quality and has gained popularity in the industry as it can prolong the lifetime of the coating, as well as the substrate. The aim of this study is to produce UV-curable alkyd coating with self-healing ability. The coating is a form of environmentally friendly self-healing coating owing to its UV curing ability and also due to the fact that the binder is produced using a significant amount of a renewable resource, palm oil. The self-healing alkyd coating is comprised of microcapsules containing healing agent, embedded into alkyd coating matrix. Diglycidyl ether bisphenol-A-based epoxy (EPON828) and pentaerythritol tetrakis (3-mercaptopropionate) were chosen as the healing agents in this work due to their compatibility with the matrix. Self-healing process of the coating takes place within 10 min after the coating was intentionally damaged. The efficacy of the self-healing ability of the coating was investigated using electrochemical impedance spectroscopy measurement. Note de contenu : - EXPERIMENTAL : Materials - Microencapsulation of EPON828 and pentaerythritol tetrakis, PETMP - Analysis of microcapsule size and morphology - Core content characterization - Thermal anlaysis of microcapsule - Alkyd synthesis - Preparation of coating mixture - Coating film properties - Corrosion study - RESULTS AND DISCUSSION : Microcapsule size and morphology - Core content analysis - Thermal analysis of microcapsules - Characterization of alkyd - Coating film properties - EIS measurement DOI : 10.1007/s11998-018-0124-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0124-x Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32417 [article]

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Composite PCL/HA/simvastatin electrospun nanofiber coating on biodegradable Mg alloy for orthopedic implant application / Abdelrahman I. Rezk in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 477-489 Titre : Composite PCL/HA/simvastatin electrospun nanofiber coating on biodegradable Mg alloy for orthopedic implant application Type de document : texte imprimé Auteurs : Abdelrahman I. Rezk, Auteur ; Hamouda M. Mousa, Auteur ; Joshua Lee, Auteur ; Chan Hee Park, Auteur ; Cheol Sang Kim, Auteur Année de publication : 2019 Article en page(s) : p. 477-489 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biodégradation Caractérisation Corrosion électrochimique Essais (technologie) Hydroxyapatite L'hydroxyapatite est une espèce minérale de la famille des phosphates, de formule Ca5(PO4)3(OH), usuellement écrite Ca10(PO4)6(OH)2 pour souligner le fait que la maille de la structure cristalline comprend deux molécules. L'hydroxyapatite est le membre hydroxylé du groupe apatite. L'ion OH- peut être remplacé par le fluor, le chlore ou le carbonate. L'hydroxyapatite cristallise dans le système hexagonal. La poudre d'hydroxyapatite pure est blanche. Celles que l'on trouve dans la nature peuvent cependant être de couleur marron, jaune ou verte. Implants médicaux Implants orthopédiques Magnésium -- Alliages Matériaux hybrides Métaux Nanofibres Nanoparticules Poly-e-caprolactone Revêtements organiques Simvastatine La simvastatine est une statine, c’est-à-dire un inhibiteur puissant de l'enzyme hydroxyméthylglutaryl CoA réductase — ou HMG-CoA réductase — (enzyme impliquée dans la biosynthèse du cholestérol). La simvastatine abaisse la concentration des triglycérides et augmente la dégradation du LDL-cholestérol. La simvastatine pourrait réduire la progression de la plaque d'athérome et donc la mortalité par accident cardiovasculaire. Comme certains inhibiteurs de L'HMG-CoA réductase sont tératogènes chez l'animal, la simvastatine est contre-indiquée pour la femme enceinte. Test d'immersion Index. décimale : 667.9 Revêtements et enduits Résumé : Recently, magnesium (Mg) and its alloys have attracted more attention because of their biodegradability and fascinating mechanical properties in the medical field. However, their low corrosion resistance and high degradability in the body have a great effect on mechanical stability and cytocompatibility, which hinders its clinical applications. Therefore, here we introduce a bifunctional composite coating composed of polycaprolactone and synthesized hydroxyapatite nanoparticles (HA-NPs) loaded with simvastatin deposited on the AZ31 alloy via electrospinning technique. The synthesized HA-NPs and composite nanofibers layer were characterized using TEM, FE-SEM, FTIR, and XRD to understand the physiochemical properties of the composite nanofibers compared to pristine polymer and bare alloy. Corrosion resistance was evaluated electrochemically using potentiodynamic polarization and EIS measurements, and biodegradability was evaluated in terms of pH and Mg ions release in SBF solution. The as-prepared coating was found to retard the corrosion and increased the osteocompatibility as resulted in cell culture test, a higher cell attachment and proliferation on the implant biointerface, in addition to releasing simvastatin in a controlled platform. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of hydroxyapatite nanoparticles (HA-NPs) - Preparation of PCL/HA-NPs/simvastatin nanocomposite coating - Surface characterization - Electrochemical corrosion test - Immersion test - Drug release test - Cytocompatibility and cell proliferation - RESULTS AND DISCUSSION : Materials characterization - Sample biodegradability - Drug release test - Cytocompatibility and cell profileration DOI : 10.1007/s11998-018-0126-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0126-8 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32418 [article]

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Heat dissipation on electrical conductor composites by combination of carbon nanotubes and graphene nanoplatelets / S. G. Prolongo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 494-498 Titre : Heat dissipation on electrical conductor composites by combination of carbon nanotubes and graphene nanoplatelets Type de document : texte imprimé Auteurs : S. G. Prolongo, Auteur ; O. Redondo, Auteur ; M. Campo, Auteur ; A. Urena, Auteur Année de publication : 2019 Article en page(s) : p. 494-498 Note générale : BIbliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : This work analyzes the electrical heating by Joule’s effect of epoxy resins doped with carbon nanotubes (CNTs), graphene nanoplatelets (GNPs) or a combination of both. The main objective is to obtain heat-dissipating materials with relatively high electrical conductivity for future applications in smart electrical and electronic devices. In addition, a thermal and mechanical characterization of the composites is carried out in order to study the combined effect of CNT and GNP. Different nanocomposites were manufactured by a three-roll mill process, as the dispersion technique. A thermal infrared camera was used to acquire the temperature’s increment due to Joule’s heating. CNT addition induces an important increase in electrical conductivity, which has associated an important heating. The combined addition of both nanofillers, GNP and CNT, scarcely modifies the electrical conductivity, but it induces an important increase in thermal conductivity of the composites. This helps lead to a more homogeneous heating and therefore a more efficient heat dissipation. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Samples preparation - Characterization - RESULTS AND DISCUSSION : Morphology - Thermal and mechanical properties - Hyd DOI : 10.1007/s11998-018-0127-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0127-7 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32419 [article]

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Bio-based reactive diluent derived from cardanol and its application in polyurethane acrylate (PUA) coatings with high performance / Yun Hu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 499-509 Titre : Bio-based reactive diluent derived from cardanol and its application in polyurethane acrylate (PUA) coatings with high performance Type de document : texte imprimé Auteurs : Yun Hu, Auteur ; Guodong Feng, Auteur ; Qianqian Shang, Auteur ; Caiying Bo, Auteur ; Puyou Jia, Auteur ; Chengguo Liu, Auteur ; Feng Xu, Auteur ; Yonghong Zhou, Auteur Année de publication : 2019 Article en page(s) : p. 499-509 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux Caractérisation Cardanol Chimie -- Essais et réactifs Copolymère uréthane acrylate Diluants Huile de ricin et constituants Polymères hautes performances Revêtements -- Propriétés mécaniques Revêtements -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : A UV-curable cardanol-based monomer (ECGE) was prepared using cardanol and epichlorohydrin, followed by epoxidation of the unsaturation in alkyl side chains of cardanol segments. After its chemical structure was confirmed by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance (1H NMR), ECGE was used as a reactive diluent to copolymerize with castor oil-based polyurethane acrylate (PUA) and a series of UV-curable coatings were prepared. Results showed that the viscosity and volume shrinkage of the UV-curable PUA system decreased significantly after the introduction of cardanol-based monomer while maintaining reasonably high bio-renewable contents; when containing 50% of ECGE, the biomass content reaches 66.2%, which is 1.41 times that of pure resin. In addition, the coating properties were evaluated to determine hardness, adhesion, flexibility, and water resistance. The properties of UV-curable thermoset were also studied using tensile testing, dynamic mechanical thermal analysis, and thermogravimetric analysis. The cardanol-based coatings showed excellent adhesion, flexibility, medium hardness, and enhanced char yield although tensile strength, tensile modulus and glass transition temperatures were somewhat diminished. All these performances can be attributed to the unique architectures of ECGE that combined the structural features of rigid benzene ring and long flexible alkyl chains. The UV-curing behavior was determined using real-time IR, and the results indicated that the conversion of unsaturated bond was increased with more concentration of ECGE. Note de contenu : - MATERIALS - Characterization - Synthesis of epoxidized cardanol glycidyl ether (ECGE) - Preparation of the UV-curable coatings - RESULTS AND DISCUSSION : Structure characterization of ECG - Bio-based content of the UV-curable coatings - Viscosity - UV-curing behaviors of the UV-curable bio-based coatings - Volumetric shrinkage of the UV-curable coatings - Gel contents of the UV-curable coatings - Tensile properties - DMA of the UV-curable bio-based coatings - Thermal properties of the UV-curable bio-based coatings - Coatings properties of the UV-curable bio-based coatings - Proposed dual-curing mechanism DOI : 10.1007/s11998-018-0128-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0128-6 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32420 [article]

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Synthesis and characterization of high-temperature-resistant and optically transparent polyimide coatings for potential applications in quartz optical fibers protection / Yaojia Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 511-520 Titre : Synthesis and characterization of high-temperature-resistant and optically transparent polyimide coatings for potential applications in quartz optical fibers protection Type de document : texte imprimé Auteurs : Yaojia Zhang, Auteur ; Lingqiao Qu, Auteur ; Jingang Lu, Auteur ; Xiao Wu, Auteur ; Yan Zhang, Auteur ; Renlong Zhang, Auteur ; Haoran Qi, Auteur ; Xiumin Zhang, Auteur Année de publication : 2019 Article en page(s) : p. 511-520 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fibres optiques Hautes températures Polyimides Quartz Résistance thermique Revêtements -- Propriétés optiques Revêtements organiques Revêtements protecteurs Transparence (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : A series of optically transparent and colorless polyimide (CPI) coatings for quartz optical fibers (QOFs) protection were prepared by the copolymerization of two aromatic dianhydrides, 3,3′,4,4′-biphenyltetracarboxylic acid dianhydride (BPDA) and 2,2′-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA), and 2,2′-bis(trifluoromethyl)benzidine (TFMB) by a two-step polymerization procedure via the soluble poly(amic acid) (PAA) precursors followed by thermal imidization at elevated temperatures. Various QOFs with the flexible and tough CPI coatings were successfully fabricated. Scanning electron microscopy measurements revealed that the CPI coatings tightly adhered to the quartz optical fibers without adding any adhesion promoters. The CPI coatings exhibited good optical transparency with the transmittance higher than 83% at 450 nm at a thickness of 10 μm, high lightness (L* > 93), low yellow indices (b* as low as 2.66), and low turbidity (haze as low as 0.57%). In addition, the CPI coatings exhibited good thermal and dimensional stability with glass transition temperatures (Tg) higher than 349°C and coefficients of linear thermal expansion (CTE) as low as 6.8 × 10−6/K in the range of 50–300°C. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials - Characterization methods - Polyimide coating preparation and QOF fabrication - RESULTS AND DISCUSSION : Polyimide coatings preparation and QOF micromorphology - Optical properties - Thermal properties DOI : 10.1007/s11998-018-0129-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0129-5 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32421 [article]

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An evaluation of models and computational approaches for the barrier properties of coatings containing flakes of high aspect ratio / A. Tsiantis in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 521-530 Titre : An evaluation of models and computational approaches for the barrier properties of coatings containing flakes of high aspect ratio Type de document : texte imprimé Auteurs : A. Tsiantis, Auteur ; T. D. Papathanasiou, Auteur Année de publication : 2019 Article en page(s) : p. 521-530 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Matériaux -- Propriétés barrières Paillettes Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : We report on the results of a comprehensive two-dimensional computational study of diffusion across disordered flake composites. Our objective is (1) the evaluation of existing literature models for the effect of flake orientation and (2) the evaluation of the influence of boundary conditions and unit-cell types on the predicted barrier properties. Flake orientation is an important parameter affecting barrier properties in flake-filled composites, as the barrier efficacy of such systems depends significantly on the extent to which the flakes have been oriented as close as possible to being perpendicular to the direction of macroscopic diffusion. Our comparisons rely on an extensive set of computational results in two-dimensional, doubly periodic unit cells, each containing up to 3000 individual unidirectional flake cross-sections which are randomly placed and with their axes forming an angle (π/2 − θ) with the direction of macroscopic diffusion. A unique feature of our study is the consideration of high aspect ratio (α) systems with α = 100 and α = 1000, from the dilute (αφ = 0.01) and into the very concentrated (αφ = 40) regime. The effective diffusivity of the corresponding unit cells is computed from the imposed concentration difference and the computed mass flux, using Fick’s Law. We show that use of cyclic boundary conditions and doubly periodic unit cells results in effective diffusivities which are in agreement with theory and invariant of the shape of the unit cell. In addition, we show that the use of adiabatic boundary conditions produces erroneous results at high flake concentrations. Comparison of our results with existing theoretical models revealed several shortcomings of the latter concerning both the effect of flake concentration (αφ) and the effect of the orientation angle (θ). The principal reason for the latter shortcoming is the fact that said models do not respect the rotational invariance of the diffusivity tensor. Note de contenu : - COMPUTATIONAL - RESULTS AND DISCUSSION : Effect of boundary conditions - Comparison to other relevant models DOI : 10.1007/s11998-018-0130-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0130-z Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32422 [article]

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Novel phosphorus-containing epoxy resin from renewable resource for flame-retardant coating applications / Deepak M. Patil in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 531-542 Titre : Novel phosphorus-containing epoxy resin from renewable resource for flame-retardant coating applications Type de document : texte imprimé Auteurs : Deepak M. Patil, Auteur ; Ganesh A. Phalak, Auteur ; Shashank T. Mhaske, Auteur Année de publication : 2019 Article en page(s) : p. 531-542 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Ressources renouvelables Revêtements protecteurs Sébacique, Acide L'acide sébacique (décanedioïque, 1-8,octanedicarboxylique, HOOC(CH2)8COOH) appartient à la série homologue des acides dicarboxyliques aliphatiques. Leurs sels et esters sont appelés sébaçates. Il est obtenu par la décomposition de l'acide ricinoléique qui est issu de l’huile de ricin. Il sert de monomère, avec l'hexaméthylènediamine (1,6-diaminohexane), pour la synthèse d'un polyamide : le PA 6-10 (polyhexaméthylène sébaçamide). Particularités : Les acides dicarboxyliques aliphatiques ont des propriétés qui leur sont propres. En effet, on remarque que les composés ayant un nombre impair de carbone ont un point de fusion relativement inférieur au composés comportant un nombre pair de carbone. Ces différences sont dues à leur différents états cristallin, plus communément appelé polymorphisme. Ce polymorphisme est causé par les liaisons hydrogène formées par les fonctions acides carboxyliques. Les liaisons se font différemment selon le nombre de carbone présent dans la molécule. Index. décimale : 667.9 Revêtements et enduits Résumé : A phosphorus-containing epoxy resin has been derived from a renewable resource, sebacic acid (SA), and formulated for flame-retardant applications. The synthesized epoxy resin was characterized by physicochemical and spectral analysis including Fourier-transform infrared (FTIR), 1H and 31P nuclear magnetic resonance spectroscopies. Curing of the epoxy resin mixture was carried out with polyamide hardener at 1:1 stoichiometry on equivalent weight basis. The developed coatings were characterized in terms of their mechanical, solvent, gel content, water absorption, chemical, thermal, and flame-retardant properties, while the glass-transition temperature and thermal stability of the coatings were analyzed by differential scanning calorimetry and thermogravimetric analysis, respectively. The results revealed that the coatings with added SA-based epoxy resin showed good mechanical, chemical, and solvent-resistance properties. The thermal profile of the coatings manifested that the char yield increased with the concentration of the SA-based epoxy resin. Limiting oxygen index (LOI) and UL-94 tests were performed to understand the flame-retardancy behavior of the synthesized coatings, revealing an enhancement as the concentration of phosphorus-containing epoxy resin was increased. Note de contenu : - EXPERIMENTAL : Materials - Methods - Formulation and preparation of coating - CHARACTERIZATION : Physicochemical analysis - Acid value (ASTM D1982-87) - Instrumental analysis - Coating characterization - RESULTS AND DISCUSSION : FTIR analysis - H NMR ANALYSIS - P NMR ANALYSIS : Thermal analysis - COATING ANALYSIS : Mechanical properties - Chemical and solvent resistance - Flame-retardant analysis DOI : 10.1007/s11998-018-0116-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0116-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32423 [article]

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Combustion of waterborne intumescent flame-retardant coatings with hybrid industrial filler and biofiller / Khairunisa Md Nasir in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 543-553 Titre : Combustion of waterborne intumescent flame-retardant coatings with hybrid industrial filler and biofiller Type de document : texte imprimé Auteurs : Khairunisa Md Nasir, Auteur ; Nor Hafizah Ramli Sulong, Auteur ; Nor Hafizah Ramli Sulong, Auteur ; Talal Fateh, Auteur ; Mohd Rafie Johan, Auteur ; Amalina Muhammad Afifi, Auteur Année de publication : 2019 Article en page(s) : p. 543-553 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux Calorimétrie Charges (matériaux) Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Intumescence (chimie) Revêtements en phase aqueuse -- Additifs Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : This paper presents the combustibility and thermal stability of an intumescent coating system, which incorporates rice husk ash (RHA) and eggshell as abundant by-products, with two other industrial fillers, namely TiO2 and Al(OH)3. Evaluation was performed using cone calorimeter test at 50 kW m−2 and TGA. Experimental results indicated the influence of fillers on the combustibility properties of coating samples and the decomposition rate of coating materials. The TGA results demonstrated that the addition of RHA and eggshell results in the excess residue weight of more than 35% of the total weight loss. The cone calorimeter test results revealed the coating, which consists of TiO2 and RHA, exerts no effect on fire growth because no ignition is observed. The results proved a remarkable fire resistance of waterborne intumescent coating with the addition of RHA and TiO2 which (1) reduces the total heat release rate (HRR) and heat of combustion; (2) increases the carbon monoxide, carbon dioxide, and smoke yields; and (3) releases the lowest amount of gaseous oxygen released. Consequently, the appropriate combination of hybrid industrial fillers and biofillers has significant influence on the combustibility performance and decomposition of the intumescent coating system. Note de contenu : - MATERIALS AND METHODS : Experimental setup - RESULTS AND DISCUSSION : Thermal stability of intumescent coatings characterization - Cone calorimetric data DOI : 10.1007/s11998-018-0136-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0136-6 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32424 [article]

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Optical analysis of coatings including diffractive pigments using a high-resolution gonioreflectometer / Jiri Filip in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 555-572 Titre : Optical analysis of coatings including diffractive pigments using a high-resolution gonioreflectometer Type de document : texte imprimé Auteurs : Jiri Filip, Auteur ; Radomir Vavra, Auteur ; Frank J. Maile, Auteur Année de publication : 2019 Article en page(s) : p. 555-572 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Diffraction Goniométrie Pigments à effets spéciaux Revêtements -- Propriétés optiques Spectroscopie de réflectance Index. décimale : 667.9 Revêtements et enduits Résumé : The aim of this article is to demonstrate a new way of measuring and understanding the appearance of pigment flake orientation and texture in special effect pigments for use in industrial coatings. We have used diffractive pigments and analyzed the relative orientation of the particles in the coating layers by evaluating their behavior in two common industry applications: solventborne and powder coatings. We have measured the interference color by taking readings with a high-resolution gonioreflectometer, in order to test the viability of automatic diffractive pigment evaluation. The results were analyzed using both psychophysical (i.e., human) and computational (i.e., mechanical) methods. Our later psychophysical and computational analysis of the visual differences that diffractive pigments present in both solventborne (1) and powder coating (2) systems for in-plane and out-of-plane geometries revealed that solventborne liquid paint systems better preserve the appearance of original diffraction gratings. This is due to enhanced orientation of the anisotropic pigment particles. The powder coating surfaces investigated, on the other hand, preserved higher intensity and thus visibility in randomly oriented solitary flakes, creating a greater sparkle contrast. We confirmed our findings by capturing and visualizing coating appearance by means of a bidirectional texture function. We then compared the diffractive pigment evaluation results with other state-of-the-art measuring device readings. We believe that our work provides valuable information on flake orientation and also compares pigment performance in a range of industrial coating systems, which may enable industrial companies to improve paint spraying processes. Note de contenu : - INTRODUCTION : The use of diffractive pigments in industry - The optical appearance of surfaces including diffractive pigments - Manufacture of diffractive pigments - Coatings systems analyzed for this study and panel preparation - EXISTING ANALYSIS METHODS FOR EFFECT COATINGS TO DATE : Angular analysis of effect pigments in general - Analysis of coatings containing diffractive pigments - Texture analysis of effect coatings - MOTIVATION EXPERIMENT ON THE VISUAL APPEARANCE OF DIFFRACTIVE PIGMENTS - DEVELOOPMENT OF AN AUTOMATIC METHOD OF DIFFRACTIVE PIGMENT : Apearance acquisition system - Geometry decription - ANALYSIS : Psychophysical analysis - Computational texture data analysis - EXPERIMENTS ON PIGMENTS OF VARYING CONCENTRATION : Higher pigmentation samples - Lower pigmentation samples - COMPARISON OF PROPOSED METHOD TO A STATE-OF-THE-ART TEXTURE MEASUREMENT DEVICE - CAPTURE APPEARANCE ON COATED OBJECTS DOI : 10.1007/s11998-018-0137-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0137-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32425 [article]

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Improved homogeneity of plasma and coating properties using a lance matrix gas distribution in MW-PECVD / Dennis Kirchheim in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 573-583 Titre : Improved homogeneity of plasma and coating properties using a lance matrix gas distribution in MW-PECVD Type de document : texte imprimé Auteurs : Dennis Kirchheim, Auteur ; Stefan Wilski, Auteur ; Montgomery Jaritz, Auteur ; Felix Mitschker, Auteur ; Moritz Oberberg, Auteur ; Jan Trieschmann, Auteur ; Lars Banko, Auteur ; Markus Brochhagen, Auteur ; Rabea Schreckenberg, Auteur ; Christian Hopmann, Auteur ; Marc Böke, Auteur ; Jan Benedikt, Auteur ; Teresa de los Arcos, Auteur ; Guido Grundmeier, Auteur ; Dario Grochla, Auteur ; Alfred Ludwig, Auteur ; Thomas Mussenbrock, Auteur ; Ralf Peter Brinkmann, Auteur ; Peter Awakowicz, Auteur ; Rainer Dahlmann, Auteur Année de publication : 2019 Article en page(s) : p. 573-583 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dépôt chimique en phase vapeur Dioxyde de silicium Revêtements Simulation par ordinateur Technique des plasmas Index. décimale : 667.9 Revêtements et enduits Résumé : Plasma reactors for the application of silicon oxide coatings (SiOx) are often customized to optimize the processes regarding substrate properties and targeted functionalities. The design of these reactors is often based on qualitative considerations. This paper evaluates the use of a numerical, free simulation software for continuous mechanical problems (OpenFOAM) as a tool to evaluate reactor design options. As demonstrator for this purpose serves a given reactor for large-area pulsed microwave plasmas with a precursor inlet in the form of a shower ring. Previous results indicate that the shower ring may lead to an inhomogeneity in plasma and coatings properties along the substrate surface. Thus, a new precursor inlet design shall be developed. For this, the distribution of the process gases in the reactor for a variety of gas inlet designs and gas flows was simulated and a design chosen based on the results. The reactor was modified accordingly, and the simulations correlated with experimental results of plasma and coating properties. The results show that, despite many simplifications, a simulation of the neutral gas distribution using an open-access software can be a viable tool to support reactor and process design development. Note de contenu : - EXPERIMENTAL SECTION : Characterization methods, coatings, and initial plasma chamber - Initial plasma chamber - Electron density - Coating characteristics - Substrate - RESULTS : Investigations on plasma and coating properties for square ring gas inlet - Numerical simulation - Plasma and coating characterization after simulation-based redesign - Electron densities - Stress measurements - Water vapor transmission rate (WVTR) - DISCUSSION DOI : 10.1007/s11998-018-0138-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0138-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32426 [article]

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Corrosion protection of carbon steel using hydrotalcite/graphene oxide nanohybrid / Thuy Duong Nguyen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 585-595 Titre : Corrosion protection of carbon steel using hydrotalcite/graphene oxide nanohybrid Type de document : texte imprimé Auteurs : Thuy Duong Nguyen, Auteur ; Bo An Tran, Auteur ; Ke Oanh Vu, Auteur ; Anh Son Nguyen, Auteur ; Anh Truc Trinh, Auteur ; Gia Vu Pham, Auteur ; Thi Xuan Hang To, Auteur ; Minh Vuong Phan, Auteur ; Thanh Thao Phan, Auteur Année de publication : 2019 Article en page(s) : p. 585-595 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier au carbone Anticorrosifs Anticorrosion Electrochimie Essais de brouillard salin Hydrotalcites Matériaux hybrides Métaux -- Revêtements protecteurs Oxyde de graphène Index. décimale : 667.9 Revêtements et enduits Résumé : Zinc aluminum hydrotalcite/graphene oxide (HTC-GO) nanohybrid as inhibition additive for organic coatings was prepared using the co-precipitation method. The synthesized HTC-GO was characterized using Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy, and thermogravimetric analysis. Surface charge properties of HTC-GO were evaluated with zeta potential measurement. The corrosion inhibition effect of HTC-GO on carbon steel in NaCl solution was investigated using electrochemical methods, energy-dispersive X-ray, and SEM. The effect of HTC-GO on corrosion resistance of epoxy coating applied on carbon steel was evaluated by salt spray test. It was shown that hydrotalcite structures were formed on GO surface, subsequently becoming hydrotalcite/graphene oxide nanohybrid. The results obtained by electrochemical measurements indicate that HTC-GO is an anodic corrosion inhibitor with an inhibition efficiency of about 92% at 1 g/L concentration. The presence of intercalated GO improved the barrier properties and adsorption of HTC-GO on steel surface. The corrosion resistance of epoxy coatings was improved with 1 wt% HTC-GO. Note de contenu : - EXPERIMENTAL : Materials - Preparation of graphene oxide - reparation of HTC and HTC-GO - Coating preparation - Analytical characterization - Electrochemical measurements - Corrosion test - RESULTS AND DISCUSSION : Characterization of HTC-GO - Corrosion inhibition effect of HTC-GO - Salt-spray test DOI : 10.1007/s11998-018-0139-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0139-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32427 [article]

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Preparation of novel organo-montmorillonite and its influence on the acid resistance of hybrid cathodic electrodeposition polyurethane coating / Zijian Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 597-605 Titre : Preparation of novel organo-montmorillonite and its influence on the acid resistance of hybrid cathodic electrodeposition polyurethane coating Type de document : texte imprimé Auteurs : Zijian Li, Auteur ; Cuiping Li, Auteur ; Dongxin Li, Auteur ; Yuxiang Jiang, Auteur ; Zaifeng Li, Auteur Année de publication : 2019 Article en page(s) : p. 597-605 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Electrophorèse Matériaux hybrides Montmorillonite Polymères à terminaison hydroxyle Polyuréthanes Pulvérisation cathodique Résistance chimique Revêtements:Peinture Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Index. décimale : 667.9 Revêtements et enduits Résumé : Based on the super-composite effect of clay minerals consisting of silicate layers on the polymer, nano-hybrid organic–inorganic composites have attracted great interest. In this paper, a novel organoclay with reactive hydroxyl group was prepared by incorporation into a hydroxyl-terminated cationic polyurethane oligomer (HTCPU) via interlamination. Sodium montmorillonite was organically modified with HTCPU oligomers in the water medium. The modified organo-montmorillonite was characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction, and thermogravimetric analysis. After sequential poly-addition reactions, the hydroxyl-terminated polyurethane hybrid resins with nano-silica layers were prepared and then the resin mixed with blocked hexamethylene diisocyanate trimer (crosslinking agent) in advance and then was emulsified with deionized water to produce the nano-hybrid electrophoresis coating. A series of PU films were prepared by the electrophoresis process. The optimized baking temperature was determined by in situ FTIR, and the effect of the organo-montmorillonite content on the acid resistance of film was studied. When the mass fraction of organo-montmorillonite was about 0.35%, the PU film showed the best acid resistance. It was found that the desirable appearance and properties could be obtained by a prebake of a temperature of 80°C to remove water in the wet film to avoid the pinholes in the paint film for 20 min, followed by a baking temperature of 135°C for 60 min. Note de contenu : - EXPERIMENTAL : Materials - Preparation of water-dispersed hydroxyl-terminated cationic polyurethand oligomers - Preparation of novel OMMT with reactive hydroxyl group - Preparatioin of nano-clay hybrid electrophoresis resins - Preparation of electrodeposited PU films - CHARACTERIZATION FTIR spectroscopy - X-ray diffraction - Thermogravimetric analysis - In situ FTIR analysis - Transmission electron microscopy - Acid resistance - RESULTS AND DISCUSSION : Characterization of novel OMMT DOI : 10.1007/s11998-018-0141-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0141-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32428 [article]

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Characterization of paint formulated using secondary TiO2 pigments recovered from waste paint / Mikael C. F. Karlsson in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 607-614 Titre : Characterization of paint formulated using secondary TiO2 pigments recovered from waste paint Type de document : texte imprimé Auteurs : Mikael C. F. Karlsson, Auteur ; Rubén Alvarez-Asencio, Auteur ; Romain Bordes, Auteur ; Anders Larsson, Auteur ; Phil Taylor, Auteur ; Britt-Marie Steenari, Auteur Année de publication : 2019 Article en page(s) : p. 607-614 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dioxyde de titane Peinture (produits chimiques) -- Recyclage Recyclage (déchets, etc.) Index. décimale : 667.9 Revêtements et enduits Résumé : The paint industry is continuously striving to reduce its environmental impact, especially when it comes to the major virgin white pigment, titanium dioxide (TiO2). In this work, recycled TiO2 pigment was used in a paint formulation as a replacement for pigment made from virgin raw materials. The paint was evaluated based on pH, Stormer and ICI viscosities, gloss, hiding power, and color characteristics. The paint films were also characterized by LVSEM–EDS, AFM, and profilometry. The most significant difference between a paint based on recycled pigments and a paint based on virgin pigments was the agglomeration of pigment particles which gave a reduction in gloss and a rougher surface of the dried paint film based on recycled pigment, and it could be concluded that the recycled pigment could not be used without accepting a small decrease in paint quality. This points toward two main directions: (1) the use of recycled pigment in applications with less demand on surface finish and gloss, such as ceiling paints, and (2) that further work on formulation should be carried out with the recycled pigment as for any other new pigment introduced in a paint formulation to optimize its performance. Note de contenu : - MATERIALS AND METHODS : Test methods used on liquid paints - Test methods used on dry paint films - RESULTS : Liquid paint - Dry paint - CONCLUDING REMARKS DOI : 10.1007/s11998-018-0132-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0132-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32429 [article]

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Durable silica antireflective coating prepared by combined treatment of ammonia and KH570 vapor / Jichen Huang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 615-622 Titre : Durable silica antireflective coating prepared by combined treatment of ammonia and KH570 vapor Type de document : texte imprimé Auteurs : Jichen Huang, Auteur ; Yuan Liu, Auteur ; Yuanyuan Cao, Auteur ; Qun Liu, Auteur ; Jun Shen, Auteur ; Xiaodong Wang, Auteur Année de publication : 2019 Article en page(s) : p. 615-622 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de silicium Mouillage (chimie des surfaces) Revêtement antireflet Revêtements -- Propriétés optiques Sol-gel, Procédé Vapeur d'eau Index. décimale : 667.9 Revêtements et enduits Résumé : Sol–gel silica antireflective (AR) coatings possess a high specific surface area that is more susceptible to be contaminated by absorption of contaminants from the environment, which will increase the refractive index and reduce the transmittance. Ammonia and γ-methacryloxypropyltrimethoxysilane (KH570) vapor treatment was employed to passivate the silica AR coating, thereby enhancing the environmental stability. The properties of the coatings were characterized with Fourier transfer infrared absorption spectroscopy, scanning electron microscopy, atomic force microscopy, UV–Vis–NIR spectrometer, and contact angle measurement. The results showed that after the vapor treatment, the coatings became denser and the environmental stability was greatly improved. After being exposed to a humid environment (RH > 90%) and low-vacuum environment with intentionally induced organic contaminants for 60 days, the transmittance of the modified SiO2 coating decreased by only 0.08% and 0.2%, respectively. Meanwhile, the average transmittance decreased by only 0.02% after being rubbed for 1000 cycles, indicating that the co-treated coating also possessed a good abrasion resistance. Note de contenu : - EXPERIMENT : Preparation of durable SiO2 AR coatings - Characterization - RESULTS AND DISCUSSION : Chemical composition analysis - Morphology and structure analysis - Wettabiity property analysis - Mechanism of vapor treatment - Stability of the optical properties DOI : 10.1007/s11998-018-0142-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0142-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32430 [article]

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