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Free volume distribution during consolidation and coalescence of latex films / A. J. Hill in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 913 (02/2001)
[article]
Titre : Free volume distribution during consolidation and coalescence of latex films Type de document : texte imprimé Auteurs : A. J. Hill, Auteur ; J. D. Cloyd, Auteur ; D. L. Murray, Auteur ; R. R. Stockl, Auteur ; P. P. Shang, Auteur ; R. L. McGill, Auteur ; M. R. Tant, Auteur Année de publication : 2001 Article en page(s) : p. 115-124 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Coalescence (Sciences physiques)
Latex
Polyméthacrylates
Revêtements en phase aqueuse:Peinture en phase aqueuseTags : 'Peinture émulsion' Latex 'Formation de film' Consolidation Coalescence 'Polyméthacrylate butyle' d'isobutyle' 'Volume libre' Annihilation positon 'Microscopie à force atomique' Index. décimale : 667.9 Revêtements et enduits Résumé : The focus of the work is the effect of molecular architecture on free volume distribution during consolidation and coalescence of aqueous latex emulsions. Two series of model emulsion polymers, iso-butyl methacrylate (i-BMA) and normal-butyl methacrylate (n-BMA) dispersions with varying level of trimethylolpropanetriacrylate (TMPTA) crosslinker, are studied. Coatings are characterized by positron annihilation lifetime spectroscopy (PALS), and atomic force microscopy (AFM). Formation of coherent brittle films without significant interdiffusion is achieved by consolidation below the glass transition temperature (Tg). Consolidation, or ordering/compaction of films following water evaporation at temperatures below the MFFT, results in a decrease in the relative free volume element size, Tau 3, as measured by PALS. An increase in the characteristic relaxation time for the consolidation process is evident as TMPTA levels and corresponding gel fraction increase. Consolidation below Tg is accompanied by physical aging. Coalescence and interdiffusion are achieved by annealing films at or above Tg. Annealed coatings show a decrease in Tg and an increase in PALS free volume attributed to erasure of physical aging in combination with the action of the surfactant (sodium dodecyl sulfate) as a plasticizer. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5693
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 913 (02/2001) . - p. 115-124[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001221 - Périodique Bibliothèque principale Documentaires Disponible PALS free volume study of dry and water saturated epoxies / M. M. Madani in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 872 (09/1997)
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Titre : PALS free volume study of dry and water saturated epoxies Type de document : texte imprimé Auteurs : M. M. Madani, Auteur ; R. R. Miron, Auteur ; R. D. Granata, Auteur Année de publication : 1997 Article en page(s) : p. 45-54 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Epoxyde résine' 'Polymère réticulé' 'Peinture anticorrosion' Liant 'Volume libre' 'Annihilation positon' Glycol 'Bisphénol A' 'Température transition vitreuse' 'Indice vide' 'Inhibiteur corrosion' 'A sec' 'Saturation eau' 'Etude expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : Free volume cavity sizes and fractions of epoxy specimens were determined using positron annihilation lifetime spectroscopy (PALS). PALS data were obtained before and after specimen water equilibration. Specimens were bisphenol A epoxide (B) and/or glycol epoxide (G) cured with a polyamide. Free volume sites increased linearly and cavity sizes decreased linearly with epoxide B:G ratio. Glass transition temperature (Tg) increased with epoxide B:G ratio. Water molecules in wet epoxy B filled approximately six percent of the cavities. Epoxy G cavity size increased 11.4% after water equilibrium and was ascribed to cavity expansion. PALS results differed for commercial corrosion inhibitors in wet and dry mixtures of these epoxides. Note de contenu : - INTRODUCTION : PALS background - Polymer/water interactions
- EXPERIMENTAL : Specimen preparation - PALS
- RESULTS AND DISCUSSION : PALS of 100% epoxy B during cure at room temperature - Direct water uptake and PALS measurements - Free volume cavity concentration (dry) - Free volume cavity concentration (wet) - Free volume and water uptake - Inhibitors and epoxy mixtures - Models of protective coatings systemsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18298
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 872 (09/1997) . - p. 45-54[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003541 - Périodique Bibliothèque principale Documentaires Disponible Modelling printing processes : A computational approach / C. A. Powell in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B3 (09/2005)
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Titre : Modelling printing processes : A computational approach Type de document : texte imprimé Auteurs : C. A. Powell, Auteur ; M. D. Savage, Auteur ; James Thomas Guthrie, Auteur Année de publication : 2005 Article en page(s) : p. 171-176 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Méthode des éléments finis' 'Volume de fluide méthode' 'Processus d'impression' 'Instabilités processus' Index. décimale : 667.9 Revêtements et enduits Résumé : In a variety of industrial printing processes, liquids must be transferred from one substrate to another in order to create a liquid pattern, the wet print. With the notable exception of inkjet printing, surprisingly to date there has been no serious attempt to model printing processes either theoretically or computationally. As industrial competition places increasingly stringent demands on print quality and operation speed, fundamental research into the underlying fluid mechanics of liquid printing- long overlooked - is now becoming essential. Two quite different numerical schemes, a Lagrangian finite element method and an Eulerian volume of fluid method, are reviewed and the relative merits of both methods are briefly discussed. Sample computations are then presented to illustrate how a numerical approach may be used to (a) simulate micro-scale liquid printing from a trapezoidal cavity to a moving substrate, and (b) model a ‘pintool’ in which a rod is used to deposit a small dot of liquid onto a substrate. Finally, the authors model two distinct printing-related phenomena that may lead to serious process instabilities. Note de contenu : - INTRODUCTION : Lagrangian finite element method - Volume of fluid method
- APPLICATIONS TO PRINTING : Printing liquid from a trapezoidal cavity - Printing with a pintool - The effect of imperfect cell filling in gravure printing - Gravity and rotation-driven instabilitiesDOI : 10.1007/BF02699569 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699569.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5412
in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 88, B3 (09/2005) . - p. 171-176[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003027 - Périodique Bibliothèque principale Documentaires Disponible Wear outcomes of three models of disc prostheses with two bearing materials metal-on-metal and metal-on-polyethylene / Moussa Amadji in MATERIAUX & TECHNIQUES, Vol. 111, N° 4 (2023)
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Titre : Wear outcomes of three models of disc prostheses with two bearing materials metal-on-metal and metal-on-polyethylene Type de document : texte imprimé Auteurs : Moussa Amadji, Auteur ; Hacene Ameddah, Auteur ; Hammoudi Mazouz, Auteur Année de publication : 2023 Article en page(s) : 12 p. Note générale : Bibliogr. Catégories : Alliages
Polyéthylène à ultra haut poids moléculaire
Prothèse discaleTags : 'prothèse discale' 'Matériaux du roulement' 'Pression de contact' 'Distance glissement' 'Volume d’usure' Index. décimale : 668.4 Plastiques, vinyles Résumé : Wear of facet joints is a significant problem of disc replacement prostheses. We studied the wear behavior of the three models of disc prostheses in five cases, with two choices of bearing materials Metal-on-Metal (MoM) and Metal-on-Polyethylene (MoP). Our aim is to select the main factor that influences on the wear volume results of the disc prosthesis. An axial force of 2000 N combined by an angular displacement of 6° of flexion, 2° of lateral bending and 2° of axial rotation have been applied to the upper plate, the lower plate is still completely fixed. Cases that contain MoM (CoCrMo-on-CoCrMo) bearing materials produced less wear volume compared to the case with MoP (CoCrMo-on-Polyethylene) bearing materials. On the other hand the influence of two other parameters (contact area and nature of core) is low 8.71% between cases 2 and 4 (same bearing material MoP). Therefore, we can say that the three main factors influencing the wear volume are the choice of bearing materials followed by the contact area and the nature of the core (moving or fixed). The fifth case was therefore the model that produced less wear with more degrees of freedom. Note de contenu : - Geometry of disc prostheses
- Materials selection
- Wear analysis
- Mesh generation
- Boundary and load conditions
- Table 1 : The main characteristics of the three models
- Table 2 : Presentation of the technical situations of each case
- Table 3 : The mechanichal characteristics of the biomaterials used in the simulations
- Table 4 : Number of elements for each type
- Table 5 : Volume wear under 2000N+ 6° of flexionRéférence de l'article : 406 DOI : https://doi.org/10.1051/mattech/2023031 En ligne : https://www.mattech-journal.org/articles/mattech/pdf/2023/04/mt220022.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40506
in MATERIAUX & TECHNIQUES > Vol. 111, N° 4 (2023) . - 12 p.[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24366 - Périodique Bibliothèque principale Documentaires Disponible The effect of solidification on the casting window after bubble entrainment / Zakaria Y. Ahmad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
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Titre : The effect of solidification on the casting window after bubble entrainment Type de document : texte imprimé Auteurs : Zakaria Y. Ahmad, Auteur ; Tequila A. L. Harris, Auteur Année de publication : 2014 Article en page(s) : p. 89-93 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Bulles d'air' Solifidication 'Enthalpie-Porosité' 'Volume de fluide' 'Enduction par filière' Moulage Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : The objective of this work is to investigate the feasibility of extending the velocity boundary during the slot die casting of a polymer film, by studying the dynamics of entrained bubbles as they transition from the fluid to the solid phase. The solution of interest is a relatively high viscosity non-Newtonian solution. A 2D computational fluid dynamics model, using ANSYS FLUENT 13.0 software, was developed to analyze this behavior. The volume of fluid method and enthalpy–porosity technique were used to track the air (i.e., entrained bubbles) and fluid phases and the solidification of the solution, respectively. It has been found that for this class of solution, bubbles that are entrained in the fluid phase will not diffuse out of the fluid due to the stresses formed during solidification. Thus, for relatively high viscosity non-Newtonian solution, the upper boundary of the casting window cannot be extended after a defect has originated in the film during the casting process. DOI : 10.1007/s11998-013-9502-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9502-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20620
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 1 (01/2014) . - p. 89-93[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16023 - Périodique Bibliothèque principale Documentaires Disponible