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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]
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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3843
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 6 (04/2005) . - p. 483-491[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001483 - Périodique Bibliothèque principale Documentaires Disponible Modeling of agglomerate dispersion in single screw extruders / N. Domingues in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 3 (07/2010)
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Titre : Modeling of agglomerate dispersion in single screw extruders Type de document : texte imprimé Auteurs : N. Domingues, Auteur ; M. Camesasca, Auteur ; M. Kaufman, Auteur ; Ica Manas-Zloczower, Auteur ; A. Gaspar-Cunha, Auteur ; Jose A. Covas, Auteur Année de publication : 2010 Article en page(s) : p. 251-257 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Extrusion:Polymères -- Extrusion
Matières plastiques, Travail des
Vis d'extrusion simpleTags : 'Vis d'extrusion simple' 'Simulation numérique' Modélisation Dispersion Ecoulement Erosion 'Méthode Monte Carlo' 'Caractérisation de mélange' 'Entropie Shannon' Index. décimale : 668.9 Polymères Résumé : A model for solid agglomerate dispersion in single screw extruders is proposed. The model combines numerical simulations of flow patterns in the metering section of a single screw extruder with a Monte Carlo method of clusters rupture and erosion mediated by a local fragmentation number. Particle size distributions and Shannon entropy are used for mixing characterization. The model is quite general and can be adapted for different polymer-additive systems as well as for different processing equipment. DOI : 10.3139/217.2350 En ligne : https://drive.google.com/file/d/1pt1xnN0O8KC3FsUq5ds-Jezpz3kMA0LQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9741
in INTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 3 (07/2010) . - p. 251-257[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012302 - Périodique Bibliothèque principale Documentaires Disponible Ready-to-use and advanced methodologies to prioritise the regionalisation effort in LCA / Laure Patouillard in MATERIAUX & TECHNIQUES, Vol. 104, N° 1 (2016)
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Titre : Ready-to-use and advanced methodologies to prioritise the regionalisation effort in LCA Type de document : texte imprimé Auteurs : Laure Patouillard, Auteur ; Cécile Bulle, Auteur ; Manuele Margni, Auteur Année de publication : 2016 Article en page(s) : 7 p. Note générale : Bibliogr. Langues : Français (fre) Catégories : Durée de vie (Ingénierie) Tags : 'Evaluation du cycle de vie' Incertitude 'Méthode Monte Carlo' 'Analyse sensibilité' Régionalisation Spatialisation Priorisation Index. décimale : 658.57 Recherche et développement : recherche fondamentale, nouveaux produits Résumé : The spatial dimension is an important aspect in life cycle assessment (LCA). Indeed life cycle processes, and therefore also elementary flows, are most likely to be geographically scattered due to global supply chains. The environmental impacts related to an elementary flow can be different across the globe depending on the spatial variability of ecosystem sensitivity. Integrating spatial dimension seems to be a promising way to increase LCA results’ reliability by reducing spatial uncertainties. LCA regionalisation refers to the integration of the spatial variability that really exists to improve result representativeness and reduce spatial uncertainties. As regionalisation requires additional effort for LCA practitioners, it is necessary to ensure the interest of such an effort and to prioritise it. This work proposes two methodologies to prioritise the regionalisation effort in LCA depending on the decision context and the type of study. They allow the selection of impacts, processes and regionalisation aspects that LCA practitioners need to focus on. The first one is a ready-to-use methodology and the second one involves more advanced tools based on spatial uncertainty analysis. The proposed methodologies are stepwise. The ready-to-use methodology involves tools that are already used by LCA practitioners and is based on impact contribution analysis. Regarding the advanced methodology, most relevant impact categories and processes to be further investigated for regionalisation are selected according to their impact contribution and their uncertainty level by using Monte Carlo simulation and regression analysis. The regionalisation effort is estimated depending on the confidence level required for the case study. The relevance and limits of each methodologies are investigated. Results underline the importance to take into account both impact and uncertainty contributions to select processes that need to be regionalised. The proposed methodologies highlight the need to focus on the goal and scope at the early stages of a study in order to clearly identify the intended audience and its requirements regarding study quality. A dialogue with the decision maker during the study would be beneficial. Those approaches can be relevant for other types of uncertainty but should be adapted. Référence de l'article : 105 DOI : http://dx.doi.org/10.1051/mattech/2016002 En ligne : http://www.mattech-journal.org/articles/mattech/pdf/2016/01/mt150078.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26132
in MATERIAUX & TECHNIQUES > Vol. 104, N° 1 (2016) . - 7 p.[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17953 - Périodique Bibliothèque principale Documentaires Disponible