Aller sur edunet
Accueil
Résultat de la recherche
8 résultat(s) recherche sur le tag 'vitreuse''
Ajouter le résultat dans votre panier Affiner la recherche Générer le flux rss de la recherche
Partager le résultat de cette rechercheQuantification of simultaneous solvent evaporation and chemical curing in thermoset coatings / Søren Kiil in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 5 (09/2010)
Titre : Quantification of simultaneous solvent evaporation and chemical curing in thermoset coatings Type de document : texte imprimé Auteurs : Søren Kiil, Auteur Année de publication : 2010 Article en page(s) : p. 569-586 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Polyuréthanes
Réticulation (polymérisation)
Revêtements
solvants
Thermodurcissables
Transition vitreuseTags : Revêtement 'Formation de réseau' 'Piégeage solvant' 'Densité réticulation' Polyuréthane Bi-composant 'Température transition vitreuse' Index. décimale : 667.9 Revêtements et enduits Résumé : The mechanisms of simultaneous solvent evaporation and film formation in high-solids thermoset coatings are considered. The relevant phenomena, chemical reactions, solvent diffusion and evaporation, gelation, vitrification, network mobility restrictions, and crosslinking, are quantified and a mathematical model for a curing film is presented, which does not violate the local volume balance. For model verification, a previous investigation with a polyisocyanate and a polyol in methyl amyl ketone solvent, catalyzed by an organotin compound, was selected. In contrast to earlier modelling studies, simulations can match and explain detailed experimental data. For exemplification, simulations are used to analyse the influence of the various rate phenomena on the behavior of the solvent-based polyisocyanate/polyol film. DOI : 10.1007/s11998-010-9246-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9246-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9912
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 5 (09/2010) . - p. 569-586[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 012448 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Applicability and WLF equation to polyurethane polyols and film properties of their resins Type de document : texte imprimé Auteurs : Syed Haseebuddin, Auteur ; K. V. S. N. Raju, Auteur ; M. Yaseen, Auteur Année de publication : 1995 Article en page(s) : p. 55-59 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Peinture haute teneur solide' Liant 'Uréthanne polymère' Polyol Préparation 'Propriété rhéologique' Viscosité 'Composé organique volatil' Formulation 'Température transition vitreuse' mécanique' Feuil 'Etude expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : The need to reduce solvent content of coatings in compliance to air pollution and other Statutory Regulations has led to major efforts to develop high solids coatings. The reduction in molecular weight helps to achieve application viscosity by an increase in free volume. Various polyurethane polyols have been synthesised by reacting the diols with polyisocyanates. The molecular weight and polydispersity indexes of these polyols have been determined by gel permeation chromatography (GPC). The viscosity of 50%. polyol solutions in various solvents has been determined at different temperatures. The temperature dependence on viscosity of solution of these polyols has been determined by the Williams, Landel and Ferry (WLF) equation. The non-linear regression analysis has been solved by using Levenberg Marquardt's algorithm. It is found that non-linear regression analysis gives high correlation coefficients and very low overall residual errors. The variation in the values of constants A and B for each WLF equation in the polyol solution indicates that these constants are system dependent. The values of constants A and B obtained for polyurethane polyols in a particular solvent have been used to calculate the values of glass transition temperature of the oligomer solution (Tg,) at different concentrations. The values of Tg, are found to vary with concentration. As the concentration of polymer increases there is an increase in the Tg, value. The tensile properties and resistance to scratch of resins prepared using these polyols and butylated melamine formaldehyde are better than those of conventional resins. The VOC content of these coating formulations is lower than the value prescribed by the Environmental Protection Agency (EPA). Note de contenu : - Experimental : Viscosity determinations - Equations used for analysing viscosity data - Preparation of coating formulations - Determination of VOC
- Results and Discussion : Applicability of WLF equation - Temperature dependency of viscosity - Volatile organic component (VOC) - Properties of the baked coatings of the resin - Tensile propertiesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13691
in PAINTINDIA > Vol. XLV, N° 12 (12/1995) . - p. 55-59[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 006459 - Périodique Bibliothèque principale Documentaires Disponible
Titre : DMTA: a versatile instrument for coatings industry Type de document : texte imprimé Auteurs : Ramanuj Narayan, Auteur ; S. Viswanatham, Auteur ; K. V. S. N. Raju, Auteur Année de publication : 2001 Article en page(s) : p. 41-46 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Superposition température temps' Durabilité Durcissement 'résistance choc' Flexibilité 'Résistance abrasion' Dureté 'Température transition vitreuse' 'Densité réticulation' 'Relation structure propriété' 'Propriété dynamomécanique' 'essai dynamique' 'Analyse thermomécanique' Feuil mécanique' physique' Peinture 'Matériau revêtement' Index. décimale : 667.9 Revêtements et enduits Résumé : The advent of the Dynamic Mechanical Thermal Analyzer (DMTA) has been able to provide a new insight to the scientist and engineers involved in product research and development for designing newer coating materials. DMTA is a non-resonant, forced vibration type of device capable of operating over a wide frequency range and which measures the viscoelastic response of materials under a sinusoidally oscillating stress for both supported and unsupported materials. It provides a valuable link between chemistry, morphology and performance properties of materials and its application ranges from the measurement of bulk viscoelastic properties to sophisticated analysis of the kinetics of the crosslinking reaction. The interpretations and application of dynamic data can be utilized to calculate cross-link density (XLD), elastically effective chain length between crosslinks (Mc) and the glass transition temperature of the coating materials. The results and information obtained from DMTA can be correlated with other coating film properties. The present paper describes the utility of DMTA in developing coating materials. Note de contenu : - Dynamic mechanical thermal analyzer (DMTA)
Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12628
in PAINTINDIA > Vol. LI, N° 11 (11/2001) . - p. 41-46[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001272 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Flame-retardant brominated styrene-based polymers. IX. Dibromostyene-based latexes Type de document : texte imprimé Auteurs : J. -L. Wang, Auteur ; N. A. Favstritsky, Auteur Année de publication : 1996 Article en page(s) : p. 41-48 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dibromostyrène
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Polymères ignifugesTags : 'Styrène dérivé copolymère' 'Copolymère brome' 'Butadiène 'Acrylate d'alkyle 'Acide Terpolymère Préparation 'Copolymérisation émulsion' Latex 'Relation structure propriété' 'Température transition vitreuse' 'Stabilité photochimique' 'Retardateur flamme' 'Matériau revêtement' Utilisation Textile Adhésif Peinture 'Etude expérimentale' 'Styrène(dibromo) Index. décimale : 667.9 Revêtements et enduits Résumé : Dibromostryene can copolymerize with butadiene, alkyl acrylates and methacrylates, vinyl acetate, styrene, and unsaturated carboxylic acids to form a wide variety of flame-retardant latexes via an emulsion polymerization technique. The latex is characterized in terms of glass transition temperature, residual monomer, solids content, pH, Brookfield viscosity, specific gravity, particle size, mechanical stability, UV stability, and flame retardancy. T ese novel dibromostyrene-based latexes are useful for a wide variety of applications in textile backcoatings, paints, clearcoatings, adhesives, sealants, caulks, binders, carpet backings, and so on. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of DBS/B latexes - Synthesis of DBS/S/B latexes - Synthesis of DBS/MAA/EA or BA latexes - Synthesis of DBS/MMA/2-EHA or EA latexes - Synthesis of DBS/EA/MMA/MAA latexes - Synthesis of DBS/BA/S/MAA latexes - Synthesis of DBS/2-EHA/EA/IA, DBS/BA/MMA/IA, DBS/BA/S/IA, and DBS/BA latexes with and without IA
- CHARACTERIZATION
- RESULTS : Textile backcoating - Latex based paint - Contact adhesive - Latex sealant - Nonwoven binder - Carpet backingPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18315
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 853 (02/1996) . - p. 41-48[article]Réservation
Réserver ce document
Exemplaires (2)
Code-barres Cote Support Localisation Section Disponibilité 003514 - Périodique Bibliothèque principale Documentaires Disponible 003523 - Périodique Bibliothèque principale Documentaires Exclu du prêt
Titre : Intermolecular forces in coatings Type de document : texte imprimé Auteurs : James Thomas Guthrie, Auteur Année de publication : 1996 Article en page(s) : p. 268-273 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture 'Matériau revêtement' 'Interaction intermoléculaire' Dipôle 'Liaison hydrogène' 'Propriété physique' Fusion 'Température transition vitreuse' 'Masse moléculaire' Plastifiant transition' Index. décimale : 667.9 Revêtements et enduits Résumé : The physical properties of coatings formulations in the liquid state and the solid state directly arise from interactions which exist between the various components of the formulations. In such systems we can envisage, for the liquid state, the solvent, the resin precursor, the film former, the pigment(s), extenders and any/all additives. In the solid state the solvent is removed. The interplay between the remaining species changes. The solvent provides the basis for mobility, opportunities for change and the possibility of closer approaches to homogeneity within the system (or, in certain instances, greater heterogeneity within the system). Note de contenu : - INTRODUCTION : london forces - dipole-dipole forces - interaction forces-polarisability - hydrogen bonding
- INTRAMOLECULAR FORCES AND PHYSICAL PROPERTIES : volatility
- MELTING FEATURES : the glass transition temperature - factors influencing the glass transition temperature - molar mass effects - chain branching effects - chain across linkage - plasticisers - copolymerisation - measurement of transition temperaturesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17050
in SURFACE COATINGS INTERNATIONAL > Vol. 79, N° 6 (06/1996) . - p. 268-273[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 006572 - Périodique Bibliothèque principale Documentaires Disponible
Permalink
Permalink
Permalink
