Environmental and time dependence of moisture transportation in an epoxy coating and its significance for accelerated weathering / Shi Xiaodong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 4 (07/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 4 (07/2010) . - p. 419-430 Titre : Environmental and time dependence of moisture transportation in an epoxy coating and its significance for accelerated weathering Type de document : texte imprimé Auteurs : Shi Xiaodong, Auteur ; Brian R. Hinderliter, Auteur ; Stuart G. Croll, Auteur Année de publication : 2010 Article en page(s) : p. 419-430 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Revêtements -- Détérioration Revêtements -- Effets de l'humidité Revêtements:Peinture Tags : 'Revêtement  Epoxyde'  Détérioration  'Coefficient  de  diffusion'  'Cycle  température'  'Détérioration  accélérée'  'Transport  eau/humidité'  'Réparation  défauts' Index. décimale : 667.9 Revêtements et enduits Résumé : It is increasingly appreciated that water is one of the most important factors in the durability behavior of coatings. The rate of water transportation and the degree of saturation of polymeric coatings depends on exposure history, exposure environment, and the nature of a coating. The focus here is on the time taken for transport of water and the variation it causes in thermal and mechanical properties, which have also been shown previously to have time-dependence that leads to discrepancies between different weathering regimes. This paper studied the effect of moisture on coatings’ mechanical properties and the effect of moisture and temperature on recovery of surface indentation. The reduction of mechanical properties and the increasing rate of surface defect relaxation can be explained in terms of plasticization by water. Recovery of surface defects is related to the appearance and diffusion activity of coatings during exposure. Thermogravimetric analysis showed that the content of moisture in the sample is determined by the ambient humidity, temperature, and the rate of change in these environmental parameters. Diffusion coefficients were determined from the weight change data and an activation energy was obtained via Arrhenius equation. Changes in yellowness, as an example, and signature of chemical degradation, indicated that the cycling period in accelerated weathering may affect the degradation via the amount and distribution of moisture in coatings. Diffusion of moisture is typically slow and limits the possibility of complete drying or saturation in an exposure cycle. Results from the cumulative effect of many cycles will be different depending on the conditions DOI : 10.1007/s11998-009-9209-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9209-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9764 [article]

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Estimating service lifetimes in weathering : an optimistic view / Stuart G. Croll in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 3 (09/2007)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 4, N° 3 (09/2007) . - p. 217-230 Titre : Estimating service lifetimes in weathering : an optimistic view Type de document : texte imprimé Auteurs : Stuart G. Croll, Auteur ; Brian R. Hinderliter, Auteur Année de publication : 2007 Article en page(s) : p. 217-230 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Brillance (optique) Corrosion par érosion Durée de vie (Ingénierie) Revêtements -- Effets du climat:Peinture -- Effets du climat Rupture (mécanique) Statistique Index. décimale : 667.9 Revêtements et enduits Résumé : Directly correlating lifetime to coating composition by using standardized, artificial exposures, or even natural exposure, is often very difficult. However, significant progress can be made by breaking down the problem into smaller questions, which can be separately addressed. If one understands the physical parameters that affect end-use properties, then one can also group, and thus correlate, properties according to whether they depend on processes at the surface or in the bulk of a coating, or whether they depend on defects. A scheme is presented that shows how one can use knowledge from analytical physical or chemical materials science in a statistical model related to the “chemical paradigm.” Simple physical models that use this information, about the initial state of the coating and its rate of degradation, can be used to compare the performance of coatings and estimate, simply, service lifetime depending on the property of interest, in the environment of interest. One can see that different properties are sensitive in different ways to the degradation process and decay with a different rate. Thus, although properties may be determined by the same degradation process, and location within a coating, they do not correlate directly. These approaches show how to organize our knowledge of degradation processes, and environments, and be able to make some testable predictions on how coating properties deteriorate. DOI : 10.1007/s11998-007-9024-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9024-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3638 [article]

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Monte carlo approach to estimating coating service lifetime during weathering / Stuart G. Croll in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B3 (09/2005)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 88, B3 (09/2005) . - p. 177-183 Titre : Monte carlo approach to estimating coating service lifetime during weathering Type de document : texte imprimé Auteurs : Stuart G. Croll, Auteur ; Brian R. Hinderliter, Auteur Année de publication : 2005 Article en page(s) : p. 177-183 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact Brillance (optique) Durée de vie (Ingénierie) Monte-Carlo, Méthode de Mouillage (chimie des surfaces) Résistance aux conditions climatiques Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Change in a coating surface, or bulk, during weathering is the accumulation of repeated, random, nanoscale erosion or chemical events that may be modelled using Monte Carlo techniques. Multiphase coatings, including pigments, may be simulated, as well as polymers that change their sensitivity to degradation during weathering. The results of the Monte Carlo model are compared with those of macroscopic properties, such as, gloss, fracture toughness, and wetting contact angle. Simulated properties change through the lifetime of the coating in ways that are consistent with published results. Seemingly complicated changes in properties may be described by repeated simple, random processes. Note de contenu : - EXPERIMENTAL PROCEDURE : Monte Carlo modelling - Photon flux - Modelling materials - RESULTS : Fracture toughness - Gloss - Wetting contact angle - Correlation between properties during degradation DOI : 10.1007/BF02699570 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699570.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5413 [article]

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Monte Carlo approach to estimating the photodegradation of polymer coatings / Brian R. Hinderliter in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 6 (04/2005)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 6 (04/2005) . - p. 483-491 Titre : Monte Carlo approach to estimating the photodegradation of polymer coatings Type de document : texte imprimé Auteurs : Brian R. Hinderliter, Auteur ; Stuart G. Croll, Auteur Année de publication : 2005 Article en page(s) : p. 483-491 Note générale : Bibliogr. Langues : Américain (ame) Tags : Propriété  surface  mécanique  esthétique  Etude  théorique  Simulation  numérique  Modélisation  Durabilité  Mouillabilité  Brillant  Ténacité  Relation  formulation  propriété  Polymère  Matériau  revêtement  Vieillissement  accéléré  Dégradation  photochimique  Méthode  Monte  Carlo Index. décimale : 667.9 Revêtements et enduits Résumé : The degradation of a polymer coating and predicting the coating lifetime based on physical properties and distribution within the coating of the polymer binder, pigments, and fillers are economically very important. As technologies advance and allow for control of coatings at the nanoscale level, methods such as Monte Carlo can be used not only to predict the behavior of a nanodesigned coating with time but also to design coatings, such as optimizing pigment particle distributions or optimum hard and soft phase distributions of the binders in multiphase systems for maintaining the desired property with time. Erosion of the coating surface was simulated using Monte Carlo techniques where terrestrial solar flux is the initiator for polymer segment cleavage and removal. The impact on the sensitivity of the polymer adjacent to the detached polymer segment can be increased or decreased in the model based on the chemistry and surface energy of the remaining polymer matrix. Multiple phases with varying sensitivity to degradation can be modeled. The Monte Carlo generates a statistically similar surface topography and chemistry of the coating. The results of the Monte Carlo model are compared to measurable properties such as gloss, fracture toughness, and wetting contact angle, using various published correlations of the property to the surface topology. The simulated properties change through the lifetime of the coating in ways that are consistent with observed behavior. Apparently, complicated changes in many properties can be described by the repeated application of simple, random processes. DOI : 10.1007/BF02733891 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02733891.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3843 [article]

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Simulations of nanoscale and macroscopic property changes on coatings with weathering / Brian R. Hinderliter in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 3 (07/2006)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 3, N° 3 (07/2006) . - p. 203-212 Titre : Simulations of nanoscale and macroscopic property changes on coatings with weathering Type de document : texte imprimé Auteurs : Brian R. Hinderliter, Auteur ; S. G. Groll, Auteur Année de publication : 2006 Article en page(s) : p. 203-212 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Brillance (optique) Durée de vie (Ingénierie) Molécules -- Modèles Monte-Carlo, Méthode de Prévision, Théorie de la Résistance aux conditions climatiques Revêtements -- Détérioration:Peinture -- Détérioration Revêtements -- Propriétés chimiques:Peinture -- Propriétés chimiques Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Simulation par ordinateur Théorème central limite Le théorème central limite (aussi improprement appelé théorème de la limite centrale ou centrée) établit la convergence en loi de la somme d'une suite de variables aléatoires vers la loi normale. Intuitivement, ce résultat affirme que toute somme de variables aléatoires indépendantes et identiquement distribuées tend vers une variable aléatoire gaussienne. Index. décimale : 667.9 Revêtements et enduits Résumé : Coatings are designed for and applied on a surface for both aesthetics and protection of the substrate. Many properties are measured to indicate performance, and eventual failure, of coating under these two broad categories. Monte Carlo simulations have shown success in predicting trends in macroscopic properties during exposure. The Central Limit Theorem (CLT) is applicable because damage made to a coating can come from the accumulation of a vast number of very small damage events. Application of the CLT to property equations has generated additional equations for the prediction of properties of coating with exposure, including measurable properties such as gloss, color, fracture toughness, and contact angle. These equations, when fitted to measured data, provide insight into the mechanisms of degradation processes, since the fitting parameters are physically based. They also offer a means to scale accelerated testing measurements to early field measurements of the property of interest for predicting lifetime in varied environments. DOI : 10.1007/BF02774509 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02774509.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3693 [article]

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Water concentration distribution in coatings during accelerated weathering protocols / Brian R. Hinderliter in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 3 (05/2015)  

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Water sorption and diffusional properties of a cured epoxy resin measured using alternating ionic liquids/aqueous electrolytes in electrochemical impedance spectroscopy / Brian R. Hinderliter in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 4 (12/2008)  

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