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Diamine-catalyzed urethane reaction of 1,3-propanediol with phenyl isocyanate / Jiancheng Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 6 (11/2013)
[article]
Titre : Diamine-catalyzed urethane reaction of 1,3-propanediol with phenyl isocyanate Type de document : texte imprimé Auteurs : Jiancheng Wang, Auteur ; Yunqiao Ding, Auteur ; Shijie Wang, Auteur ; Pengfei Yang, Auteur Année de publication : 2013 Article en page(s) : p. 859-864 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Catalyse
DiamineUne diamine est un type de polyamine contenant exactement deux groupes amine. Les diamines sont principalement utilisées comme monomères pour synthétiser des polyamides, des polyimides et des polyurées. La principale diamine produite est le 1,6-diaminohexane, précurseur du Nylon 6-6, suivie de l'éthylènediamine1. L'hydrazine (H2NNH2) n'est en général pas considérée comme une diamine puisque ce n'est ni une amine (pas de carbone), ni une dibase.
Fourier, Spectroscopie infrarouge à transformée de
Isocyanate de phényle
Propanediol
Réactions chimiques
UrethanesTags : 'FTIR in situ' 'Réaction uréthane' 'Diamine tertiaire' 'Activité catalytique' Index. décimale : 667.9 Revêtements et enduits Résumé : The urethane reaction of 1,3-propanediol with phenyl isocyanate is monitored by means of in situ FTIR. 1,4-Diazabicyclo[2.2.2]octane (DABCO) and N,N,N?,N?-tetramethylethane-1,2-diamine (TMEDA) are used as catalysts. Reaction rates are calculated, and reaction kinetics are studied. Furthermore, Gaussian programs are used to calculate steric configuration and electronegativity of those two diamines. The electronegativity of TMEDA is greater than that of DABCO, but the steric hindrance of DABCO in nitrogen atom is smaller. Steric hindrance plays a more important part in reaction kinetics, which makes the reaction to be catalyzed by DABCO at a faster rate. Finally, activation energy, activation enthalpy, and activation entropy for the reaction are calculated, followed by the discussion of reaction mechanism. Note de contenu : - EXPERIMENTAL : Materials and instruments - Kinetics studies - Computation methods
- RESULTS AND DISCUSSION : Kinetics for the urethane reaction - Theoretical analysis - Thermodynamic parametersDOI : 10.1007/s11998-013-9523-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9523-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19825
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 6 (11/2013) . - p. 859-864[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15744 - Périodique Bibliothèque principale Documentaires Disponible A model for the dehydration of waterborne basecoat / Paul Henshaw in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 4 (10/2006)
[article]
Titre : A model for the dehydration of waterborne basecoat Type de document : texte imprimé Auteurs : Paul Henshaw, Auteur ; Tony Mancina, Auteur ; Lindita Prendi, Auteur Année de publication : 2006 Article en page(s) : p. 285-294 Note générale : Bibliogr. Langues : Américain (ame) Tags : Vernis 'Revêtement protecteur' Distribution Concentration Déshydratation 'Copolymère uréthane' acrylate' Polyester Modélisation 'Peinture en phase aqueuse' 'Méthode des différences finies' Index. décimale : 667.9 Revêtements et enduits Résumé : In vehicle manufacturing, a common topcoat process sequence is the application of a waterborne basecoat, partial dehydration, application of a solventborne clearcoat, then curing at approximately 150°C. Anecdotal evidence suggests that under "harsh" (high temperature and velocity) dehydration conditions, a skin can be formed, which can trap excess water in the basecoat. Upon curing, the excess water forms vapor that can burst through the topcoat, leading to surface imperfections, termed pinholes or pops. A forward-time center-distance finite difference model, incorporating only diffusion and evaporation and experimentally determined coefficients, was used to simulate the water concentration in the layers of a paint film. Simulations were conducted at constant temperatures (27°C and 82°C) as well as by using temperature traces from a full-size dehydration oven under harsh (82°C) and gentle (54°C) conditions. The model accurately predicted the overall solids content after dehydration. However, in both temperature scenarios, the surface layer water concentration was less at the low temperature for the same overall solids content. This counter-intuitive finding is attributed to the increase in diffusivity with temperature, which allows water to be supplied to the surface faster in the high temperature run in each scenario. Therefore, this simple diffusion-evaporation model is not suitable for simulating water entrapment leading to popping. DOI : 10.1007/s11998-006-0024-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-006-0024-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3681
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Code-barres Cote Support Localisation Section Disponibilité 005756 - Périodique Bibliothèque principale Documentaires Disponible Preparation and characteristics of a waterborne preventive stain coating material with organic- inorganic composites / Tamaki Wada in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 4 (10/2006)
[article]
Titre : Preparation and characteristics of a waterborne preventive stain coating material with organic- inorganic composites Type de document : texte imprimé Auteurs : Tamaki Wada, Auteur ; Tadashi Uragami, Auteur Année de publication : 2006 Article en page(s) : p. 267-274 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymères
Polyaddition
Résistance aux taches
Revêtements (produits chimiques):Peinture (produits chimiques)
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements en phase aqueuse:Peinture en phase aqueuseTags : 'Polycyclohexane dicarboxylate' Copolymère Polyester 'Propriété chimique' 'Résistance Solvant Polyadipate Polyisophtalate Acide mécanique' Polyaddition 'Copolymère ester uréthane' Index. décimale : 667.9 Revêtements et enduits Résumé : With the goal of developing a waterborne coating material that prevents staining, organic-inorganic composites prepared from colloidal silica and two types of acrylic resin emulsions were investigated as exterior coatings. Conventional acrylic resin emulsion and organic silane hybridized acrylic resin emulsion prepared by emulsion polymerization were mixed with colloidal silica to form organic-inorganic composite films. The addition of colloidal silica to emulsions yielded films with higher hydrophilkities, as indicated by lower water contact angles for these films in comparison to films without colloidal silica. The water contact angles of organic silane hybridized acrylic resin emulsion/colloidal silica films were lower than those of acrylic resin emulsion/colloidal silica films. Composite films containing colloidal silica particles smaller than 100 nm in diameter showed high hydrophilicities. Observations of the dispersed state of colloidal silica particles in organic-inorganic composite films by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) demonstrated that colloidal silica particles were densely aggregated on the film surface. Outdoor exposure tests of the coating materials prepared from organic silane hybridized acrylic resin and colloidal silica particles with diameters of 7.5 nm showed excellent stain resistance. DOI : 10.1007/s11998-006-0022-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-006-0022-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3679
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Code-barres Cote Support Localisation Section Disponibilité 005756 - Périodique Bibliothèque principale Documentaires Disponible