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Surface degradation and nanoparticle release of a commercial nanosilica/polyurethane coating under UV exposure / Deborah S. Jacobs in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)
[article]
Titre : Surface degradation and nanoparticle release of a commercial nanosilica/polyurethane coating under UV exposure Type de document : texte imprimé Auteurs : Deborah S. Jacobs, Auteur ; Sin-Ru Huang, Auteur ; Yu-Lun Cheng, Auteur ; Savelas Rabb, Auteur ; Justin M. Gorham, Auteur ; Peter J. Krommenhoek, Auteur ; Lee L. Yu, Auteur ; Tinh Nguyen, Auteur ; Lipiin Sung, Auteur Année de publication : 2016 Article en page(s) : p. 735-751 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais accélérés (technologie)
Nanoparticules
Photodétérioration
Polyuréthanes
Revêtements -- Analyse:Peinture -- Analyse
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements -- Effets du rayonnement ultraviolet:Peinture -- Effets du rayonnement ultraviolet
SiliceLa 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 : Many coating properties such as mechanical, electrical, and ultraviolet (UV) resistance are greatly enhanced by the addition of nanoparticles, which can potentially increase the use of nanocoatings for many outdoor applications. However, because polymers used in all coatings are susceptible to degradation by weathering, nanoparticles in a coating may be brought to the surface and released into the environment during the life cycle of a nanocoating. Therefore, the goal of this study is to investigate the process and mechanism of surface degradation and potential particle release from a commercial nanosilica/polyurethane coating under accelerated UV exposure. Recent research at the National Institute of Standards and Technology (NIST) has shown that the matrix in an epoxy nanocomposite undergoes photodegradation during exposure to UV radiation, resulting in surface accumulation of nanoparticles and subsequent release from the composite. In this study, specimens of a commercial polyurethane (PU) coating, to which a 5 mass% surface-treated silica nanoparticle solution was added, were exposed to well-controlled, accelerated UV environments. The nanocoating surface morphological changes and surface accumulation of nanoparticles as a function of UV exposure were measured, along with chemical change and mass loss using a variety of techniques. Particles from the surface of the coating were collected using a simulated rain process developed at NIST, and the collected runoff specimens were measured using inductively coupled plasma optical emission spectroscopy to determine the amount of silicon released from the nanocoatings. The results demonstrated that the added silica nanoparticle solution decreased the photodegradation rate (i.e., stabilization) of the commercial PU nanocoating. Although the degradation was slower than the previous nanosilica epoxy model system, the degradation of the PU matrix resulted in accumulation of silica nanoparticles on the nanocoating surface and release to the environment by simulated rain. These experimental data are valuable for developing models to predict the long-term release of nanosilica from commercial PU nanocoatings used outdoors and, therefore, are essential for assessing the health and environmental risks during the service life of exterior PU nanocoatings. Note de contenu : - EXPERIMENTAL PROCEDURES : Sample preparation - UV exposure
- CHARACTERIZATION : Surface morphology and composition - Chemical degradation - Mass loss - Nanoparticle release
- RESULTS AND DISCUSSION : Surface morphology and composition - Chemical degradation - Mass loss - Nanoparticle release - Mechanism of nanoparticle release by UV exposureDOI : 10.1007/s11998-016-9796-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9796-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27107
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Code-barres Cote Support Localisation Section Disponibilité 18316 - Périodique Bibliothèque principale Documentaires Disponible Surface properties of impregnated and varnished Scots pine wood after accelerated weathering / Ergun Baysal in COLORATION TECHNOLOGY, Vol. 130, N° 2 (04/2014)
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Titre : Surface properties of impregnated and varnished Scots pine wood after accelerated weathering Type de document : texte imprimé Auteurs : Ergun Baysal, Auteur ; Eylem Dizman Tomak, Auteur ; Musa Ozbey, Auteur ; Ebedin Altin, Auteur Année de publication : 2014 Article en page(s) : p. 140-146 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Conservation
Bois -- Effets du climat
Bois -- Revêtements protecteurs
Brillance (optique)
Colorimétrie
Dureté (matériaux)
Essais accélérés (technologie)
Pins et constituants
Polyuréthanes
Surfaces -- Analyse
VernisIndex. décimale : 667.3 Teinture et impression des tissus Résumé : In this study, the effect of accelerated weathering on the surface properties of Scots pine specimens impregnated with wolmanit-CB, tanalith-E, and adolit-KD5 and coated with synthetic and polyurethane varnishes was investigated by measuring surface hardness, glossiness, and colour. Results showed that weathering caused an increase in the hardness of impregnated and varnished specimens, while it caused a decrease in the glossiness of specimens. Surfaces became rougher and darker after weathering in comparison with the initial surfaces of wood specimens. Positive values of the chromatic coordinates indicated that the wood surfaces changed from their original colour to a reddish and yellowish colour. The highest colour change was detected in the specimens coated with polyurethane varnish alone. Both copper-based wood preservative treatment and varnish coating improved the surface properties of specimens in comparison with the surface properties observed on specimens coated with varnish alone. Note de contenu : - EXPERIMENTAL : Preparation of test specimens and wood preservative - Impregnation with wood preservatives - Coating of the wood surfaced - Accelerated weathering test - Surface hardness measurements - Glossiness measurements - Colour measurements - Statistical test
- RESULTS AND DISCUSSION : Surface hardness - Glossiness - Colour changesDOI : 10.1111/cote.12070 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12070 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20870
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Code-barres Cote Support Localisation Section Disponibilité 16129 - Périodique Bibliothèque principale Documentaires Disponible Surface properties of tannin-impregnated and varnished beech wood after exposure to accelerated weathering / Mesut Yalcin in COLORATION TECHNOLOGY, Vol. 133, N° 4 (08/2017)
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Titre : Surface properties of tannin-impregnated and varnished beech wood after exposure to accelerated weathering Type de document : texte imprimé Auteurs : Mesut Yalcin, Auteur ; Huseyin Pelit, Auteur ; Caglar Akcay, Auteur ; Nevzat Cakicier, Auteur Année de publication : 2017 Article en page(s) : p. 334-340 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des données
Bois -- Effets du climat
Bois -- Vernis
Colorimétrie
Décoloration
Dureté (matériaux)
Essais accélérés (technologie)
Evaluation
Hêtre
Laine
Matériaux -- Imprégnation
Résistance à l'abrasion
Solutions aqueuses (chimie)
Tanins végétauxIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The aim of this study was to determine selected surface properties of varnished beech wood impregnated with natural extracts after exposure to accelerated weathering. Beech wood samples were impregnated with aqueous solutions of 5 and 10% mimosa (Acacia mollissima) and quebracho (Shinopsis lorentzii) tannins. After weathering, colour changes (?L*, ?a*, ?b*, and ?E*) in addition to scratch resistance and surface hardness values were calculated and evaluated. As a result of the weathering process, greater colour changes (?E*) were detected in the beech wood samples impregnated with tannins compared with the unimpregnated control samples. The least colour change occurred in the Tanalith-E-impregnated samples. Total colour change was adversely affected with tannin impregnation after the weathering processes. In terms of surface hardness and scratch resistance, the highest values were observed in the mimosa-solution-impregnated and control samples. Furthermore, it was found that scratch resistance and hardness values tended to increase during the first period of weathering and decreased thereafter. Regarding surface properties, the best results were obtained when polyurethane varnish was employed compared with the other varnish types. Note de contenu : - EXPERIMENTAL : Wool samples, impregnation, coating, and accelerated weathering - Scratch resistance - Surface hardness - Colour measurements - Data analysis
- RESULTS AND DISCUSSION : Colour changes - Scratch resistance - Surface hardnessDOI : 10.1111/cote.12287 En ligne : https://drive.google.com/file/d/17M6JGQk8pc23daH_js4uXRK1Ti4ON6FR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28887
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Code-barres Cote Support Localisation Section Disponibilité 19175 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and incorporation of poly(methyl methacrylate) microspheres with UV stabilizers in wood clear coating binder / Caroline Queant in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)
[article]
Titre : Synthesis and incorporation of poly(methyl methacrylate) microspheres with UV stabilizers in wood clear coating binder Type de document : texte imprimé Auteurs : Caroline Queant, Auteur ; Véronic Landry, Auteur ; Pierre Blanchet, Auteur ; Diane Schorr, Auteur Année de publication : 2017 Article en page(s) : p. 1411-1422 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbeurs de rayonnement ultraviolet
Bois -- Revêtements
Encapsulation
Essais accélérés (technologie)
Liants
Microsphères
Polyacryliques
Polyméthacrylate de méthyleLe poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec.Index. décimale : 667.9 Revêtements et enduits Résumé : The durability of clear coatings is an important problem in the coatings industry. This problem can be partly solved with the addition of UV absorbers (UVAs) in the coating formulation. UVAs can absorb part of the UV radiation and convert it into harmless heat. Organic UVAs are prone to photodegradation and can migrate in the binder of a coating formulation. In this study, commercial UVAs have been encapsulated in poly(methyl methacrylate) microspheres using the internal phase separation method. Microspheres have been incorporated into a clear acrylic binder. The acrylic was then applied on wood panels and was placed into an artificial UV chamber. Efficiency of coatings after aging as well as chemical and physical properties were monitored using a colorimeter, FTIR spectroscopy and transmission electron microscopy. This study presents a comparison between the efficiency of free and encapsulated Tinuvin 1130 and 292 commercial absorbers. Results have shown that the coating efficiency is slightly improved when using the encapsulated products. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of PMMA microspheres with Tinuvin 1130 and Tinuvin 292 - Characterization techniques - Introduction in a commercial binder - Accelerated aging tests - Colorimeter - Film absorbance - FTIR - Diffusion tests
- RESULTS AND DISCUSSION : DLS and microscopy - Accelerated aging tests results - Film absorbance - FTIR results - Diffusion testsDOI : 10.1007/s11998-017-9943-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9943-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29653
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Code-barres Cote Support Localisation Section Disponibilité 19441 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of polyesteramides : poly(ethylene adipate amide) and poly(ethylene succinate amide) and their application as corrosion inhibitors in paint formulations / Mohamed Heba A. in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Synthesis of polyesteramides : poly(ethylene adipate amide) and poly(ethylene succinate amide) and their application as corrosion inhibitors in paint formulations Type de document : texte imprimé Auteurs : Mohamed Heba A., Auteur ; Yasser Assem, Auteur ; Rana Said ; Ahmed M. El-Masry Année de publication : 2018 Article en page(s) : p. 967-981 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Analyse thermique
Anticorrosifs
Anticorrosion
Essais accélérés (technologie)
Formulation (Génie chimique)
Polycondensation
Polyesteramides
Polymères -- Synthèse
Polymères aliphatiques
Revêtements protecteurs
ThermogravimétrieIndex. décimale : 667.9 Revêtements et enduits Résumé : Aliphatic polyesters based on adipic or succinic acid were synthesized by polycondensation reaction to produce poly(ethylene adipate) (PEA) and poly(ethylene succinate) (PES), respectively. The prepared polyesters (PEA and PES) were modified with monoethanol amine to produce polyesteramides, namely polyethylene adipate amide (PEAA) and polyethylene succinate amide (PESA). Full characterization of PEA, PES, PEAA and PESA was achieved using thermal, spectroscopic, and gel permeation chromatography analyses. The prepared aliphatic polyesters (PEA and PES) and polyesteramides (PEAA and PESA) were evaluated as corrosion inhibitors in paint formulations. Two groups of paints were prepared with 24 paint formulations based on medium oil alkyd resin, talc, titanium dioxide, drier and the prepared polymers with different types and concentrations. All the formulations are free from any inorganic anticorrosive pigments. PEA and PEAA were incorporated in Group I formulations. Paint formulations that contain PEA are six formulations F1A, F2A, F3A, F4A, F5A and F6A in addition to F1Aa, F2Aa, F3Aa, F4Aa, F5Aa and F6Aa based on PEAA with different concentrations 0.5%, 1.5%, 2.5%, 3.5%,4.5% and 5.5%, respectively. Group II formulations contain twelve other prepared formulations F1S, F2S, F3S, F4S, F5S and F6S based on PES, in addition to F1Sa, F2Sa, F3Sa, F4Sa, F5Sa and F6Sa based on PESA with the same series of concentrations. Physical, mechanical, and chemical properties of the coated films were determined. Corrosion tests in addition to surface analysis by a scanning electron microscope were performed to study the protection efficiency of such coats on steel. It was found that the synthesized polyesteramides can protect steel from corrosion successfully in 3.5% NaCl solution depending on their adsorption on the steel surface. The extent of steel protection coated with PESA formulations was slightly higher than PEAA. Note de contenu : - EXPERIMENTAL : Materials - General procedure for the synthesis of polyesters from dicarboxylic acids and diols - Synthesis of polyesteramides PEAA and PESA - Coating formulations - Characterization techniques
- RESULTS AND DISCUSSION : Synthesis of PEA, PEAA, PES and PESA - Characterization of PEA, PEAA, PES and PESADOI : 10.1007/s11998-017-0027-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0027-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31121
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Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible TCL 16 conférence internationale sur l'enduction et le contrecollage in TEXTILES A USAGES TECHNIQUES (TUT), N° 63 (03-04-05/2007)
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