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Correlation of hardness with mfft and cpvc of latex / ceramic coatings / Ming Lei in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 75, N° 945 (10/2003)
[article]
Titre : Correlation of hardness with mfft and cpvc of latex / ceramic coatings Type de document : texte imprimé Auteurs : Ming Lei, Auteur ; L. E. Scriven, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2003 Article en page(s) : p. 95-102 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acétate de vinyle L'acétate de vinyle est l'ester de l'acide acétique (acide éthanoïque) avec le tautomère alcoolique de l'éthanal (acétaldéhyde) et de formule semi-développée, CH3COO–CH=CH2.
L'acétate de vinyle est préparé, en règle générale, en phase vapeur, en faisant réagir un grand excès d'acétylène sur de l'acide acétique (200 °C) en présence de catalyseurs au zinc et au cadmium). On obtient un liquide incolore à odeur très pénétrante qui ne se polymérise en polyacétate de vinyle (PVAC) qu'en présence de catalyseurs et donne des solides durs très stables à la chaleur. Il peut être copolymérisé avec d'autres composés vinyliques ou d'autres monomères.
Alumine
Composites
Concentration pigmentaire volumique
Dispersions et suspensions
Dureté VickersLa mesure de dureté Vickers se fait avec une pointe pyramidale normalisée en diamant de base carrée et d'angle au sommet entre faces égal à 136°. L'empreinte a donc la forme d'un carré ; on mesure les deux diagonales d1 et d2 de ce carré à l'aide d'un appareil optique. On obtient la valeur d en effectuant la moyenne de d1 et d2. C'est d qui sera utilisé pour le calcul de la dureté. La force et la durée de l'appui sont également normalisées.
Essai de dureté
Formulation (Génie chimique)
Latex
Microstructures
Particules (matières)
Polyacétate de vinyle
Porosité
Revêtement de céramique
Solutions aqueuses (chimie)Index. décimale : 667.9 Revêtements et enduits Résumé : Hardness, porosity, and microstructure of film-forming in polyvinyl acetate/alumina coatings from aqueous suspensions were investigated with a minimum film formation temperature (MFFT) bar, Vickers hardness tester, and scanning electron microscopy (SEM). The hardness of opaque composite coatings (alumina:latex = 1:2 by volume) increased abruptly at the MFFT of the latex, suggesting that the alumina particles did not change the latex film formation behavior and that the hardness measurement is an alterative to the optical criterion. Studies of coatings from latex particles that were smaller or larger than a common size of ceramic particles indicated that the composition of maximum hardness, called critical Vickers hardness concentration (CVHC), matched conventional critical pigment volume concentration (CPVC). More efficient polymer binding in the coatings from the smaller latex gave them higher peak hardness and CPVC. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5563
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Code-barres Cote Support Localisation Section Disponibilité 000570 - Périodique Bibliothèque principale Documentaires Disponible Drying and collapse of hollow latex / C. M. Cardinal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 4 (12/2009)
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Titre : Drying and collapse of hollow latex Type de document : texte imprimé Auteurs : C. M. Cardinal, Auteur ; L. E. Scriven, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2009 Article en page(s) : p. 457-469 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Corps creux
Latex
Microscopie électronique à balayage
Polymères opaques
Revêtement -- Séchage:Peinture -- SéchageIndex. décimale : 667.9 Revêtements et enduits Résumé : Hollow latex particles are used as white pigments for paints and paper coatings. In the coating dispersion, each hollow particle is filled with water. As the coating dries, water vacates the latex, leaving an air-filled void sized to scatter light (~0.5 µm) within each particle. Examinations of dried coatings reveal that hollow particles can collapse, decreasing their light scattering efficiency. Cryogenic scanning electron microscopy (cryoSEM) was used to characterize the microstructure of coatings containing hollow latex during drying. Images suggest latex voids empty after air invades into the coating interstitial space and collapse occurs late in the drying process. The effects of temperature (10–60°C), humidity (20–80%), and binder concentration (0–30 wt%) on particle collapse were also studied through SEM of dried coating surfaces. High drying temperature, high humidity, and low binder concentrations promoted collapse. For hollow latex particles with porous shell walls, temperature and humidity had little effect, whereas binder increased collapse. From these results, a theoretical model is proposed. During drying, diffusion of water from the particle creates a vacuum inside the latex. The vacuum is either relieved by nucleation of a gas bubble from the dissolved air in the water-filled particle or it causes the particle to collapse by buckling. DOI : 10.1007/s11998-009-9167-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9167-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7721
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Code-barres Cote Support Localisation Section Disponibilité 011845 - Périodique Bibliothèque principale Documentaires Disponible Drying and cracking of soft latex coatings / Christine C. Roberts in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 4 (07/2013)
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Titre : Drying and cracking of soft latex coatings Type de document : texte imprimé Auteurs : Christine C. Roberts, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2013 Article en page(s) : p. 441-451 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agrégats (chimie)
Couches minces
Latex
Microscopie électronique à balayage
Particules (matières)
Revêtement -- Séchage:Peinture -- Séchage
Revêtements -- Fissuration:Peinture -- Fissuration
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.Index. décimale : 667.9 Revêtements et enduits Résumé : The minimum film formation temperature (MFFT) is the minimum drying temperature needed for a latex coating to coalesce into an optically clear, dense crack-free film. To better understand the interplay of forces near this critical temperature, cryogenic scanning electron microscopy (cryoSEM) was used to track the latex particle deformation and water migration in coatings dried at temperatures just above and below the MFFT. Although the latex particles completely coalesced at both temperatures by the end of the drying process, it was discovered that particle deformation during the early drying stages was drastically different. Below the MFFT, cracks initiated just as menisci began to recede into the packing of consolidated particles, whereas above the MFFT, partial particle deformation occurred before menisci entered the coating and cracks were not observed. The spacing between cracks measured in coatings dried at varying temperatures decreased with decreasing drying temperature near the MFFT, whereas it was independent of temperature below a critical temperature. Finally, the addition of small amounts of silica aggregates was found to lessen the cracking of latex coatings near the MFFT without adversely affecting their optical clarity. Note de contenu : - METHODS AND MATERIALS : Materials - Cryogenic scanning electron microscopy - MFFT and crack spacing measurements - Contact angle measurements
- RESULTS : Macroscopic appearance - Microstructure developmentDOI : 10.1007/s11998-012-9425-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9425-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19094
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Code-barres Cote Support Localisation Section Disponibilité 15460 - Périodique Bibliothèque principale Documentaires Disponible 15594 - Périodique Bibliothèque principale Documentaires Disponible Effect of particle size distribution on stress development and microstructure of particulate coatings / Yan Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 2 (03/2017)
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Titre : Effect of particle size distribution on stress development and microstructure of particulate coatings Type de document : texte imprimé Auteurs : Yan Wu, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2017 Article en page(s) : p. 455–465 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbonate de calcium broyé
Copolymère styrène acrylate
Dispersions et suspensions
Granulométrie
Latex
Liants
Microstructures -- Analyse
Particules (matières)
Revêtement -- SéchageIndex. décimale : 667.9 Revêtements et enduits Résumé : The role of pigment particle size distribution on stress and microstructure development was studied for coatings prepared from aqueous suspensions of ground calcium carbonate (GCC) and latex binder. Stress development was monitored using a modified beam deflection technique under controlled environment. Microstructure was characterized by scanning electron microscopy (SEM) and cryogenic SEM. For coatings containing only GCC particles and no latex, a wide particle size distribution resulted in a significant particle size gradient in the cross-sectional microstructure and irregular stress development. With latex addition, uniform microstructures were observed in coatings with either wide or narrow GCC particle size distribution. GCC/latex coatings prepared using GCC with a wide particle size distribution developed a higher stress than those prepared using GCC with a similar average particle size but a narrow particle size distribution. The higher stress is related to the particle packing that results in smaller pore sizes and larger capillary pressures that drive compaction. In coatings prepared with the same GCC particles but different latex binders, the stress and cracking behavior of the coating depends on the latex properties. Note de contenu : - MATERIALS AND METHODS : Suspension systems - Drying stress measurement - Microstructure characterization
- RESULTS AND DISCUSSION : Coatings prepared from GCC suspensions - Coatings prepared with GGC and styrene acrylate latex - Coatings prepared with GCC-W and different types of latexDOI : 10.1007/s11998-016-9866-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9866-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28160
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Code-barres Cote Support Localisation Section Disponibilité 18781 - Périodique Bibliothèque principale Documentaires Disponible Evaluating sag resistance with a multinotched applicator : correlation with surface flow measurements and practical recommendations / Robert K. Lade in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 5 (09/2015)
[article]
Titre : Evaluating sag resistance with a multinotched applicator : correlation with surface flow measurements and practical recommendations Type de document : texte imprimé Auteurs : Robert K. Lade, Auteur ; Austin D. Musliner, Auteur ; Christopher W. Macosko, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2015 Article en page(s) : p. 809-817 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Ecoulement bidimensionnel
Essais (technologie)
Latex
Racle
Résistance à l'écoulement
Revêtements:Peinture
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : Sag is a coating defect that results from excessive, gravity-driven flow after deposition. Accordingly, characterizing resistance to sag is critically important. In this paper, sag resistance predicted using a multinotched applicator test is compared with results obtained using an in situ particle tracking technique that measures surface velocity. Four commercial latex paints dried on substrates inclined at three angles were investigated. The results are used to provide insight into the strengths and limitations of using a multinotched applicator to evaluate sag resistance. For coatings dried on vertical surfaces (90°), the suggested condition for the multinotched applicator, sag lengths found by particle tracking show differences between paints that the multinotched applicator ranked as identical. At smaller angles (e.g., 10°), the resolution of the multinotched applicator test is greatly enhanced owing to a reduction in the shear stress difference between adjacent coated lines. Based on these results, specific recommendations are made for successfully employing a multinotched applicator to evaluate sag resistance based on user-specific goals. Note de contenu : - Materials
- Anti-Sag Meter testing
- Rheological characterization of latex paints
- Sag length, initial wet film thickness, and evaporation rate measurementsDOI : 10.1007/s11998-015-9680-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9680-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24679
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Code-barres Cote Support Localisation Section Disponibilité 17467 - Périodique Bibliothèque principale Documentaires Disponible Near-IR sintering of conductive silver nanoparticle ink with in situ resistance measurement / David J. Keller in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)
PermalinkProcess limits in two-layer reverse roll transfer / M. Sasaki in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 4 (07/2013)
PermalinkA Raman spectroscopic method to find binder distribution in electrodes during drying / Hideki Hagiwara in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
PermalinkRoll-to-roll micromolding ov UV curable coatings / Yuyang Du in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)
PermalinkStress development and film formation in multiphase composite latexes / Kyle Price in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)
PermalinkWater-based coatings for 3D printed parts / Jiayi Zhu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 5 (09/2015)
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