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Role of van der Waals force in latex film formation / Xiaobo Gong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 3 (09/2008)
[article]
Titre : Role of van der Waals force in latex film formation Type de document : texte imprimé Auteurs : Xiaobo Gong, Auteur ; H. Ted Davis, Auteur ; L. E. Scriven, Auteur Année de publication : 2008 Article en page(s) : p. 271-283 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Coalescence (Sciences physiques)
Colloides
Emulsions
Formation de film
Latex
Microscopie électronique à balayage
Revêtements -- Propriétés physiques
Séchage
Van der Waals, Forces deIndex. décimale : 667.9 Revêtements et enduits Résumé : Capillary pressure force and direct surface tension force are known to be sufficient though probably not necessary to drive the compaction stage of latex film formation. There is abundant evidence that van der Waals force can draw particles together progressively more around the perimeters of interparticle contacts, but their role in compaction remains unanswered. With the powerful technique of high-resolution cryogenic scanning electron microscopy (cryo-SEM), together with fast-freezing and freeze-drying followed by controlled annealing at temperatures below and around the nominal glass transition temperature, we have documented the role of van der Waals force in film formation in the water-free condition, i.e., with capillary pressure and surface tension forces absent. Results of imaging the freeze-dried and annealed coatings are fully consistent with the hypothesis that van der Waals force alone can compact a latex coating. The rate at which particles flatten and thus the coating compacts by annealing increases, as expected, with temperature and time. The results of rewetting tests of coatings annealed at various temperatures demonstrate that compacted coating is not necessarily coalesced, and that even full compaction of solid particles can be elastic, hence reversible, rather than viscoelastic or viscoplastic. Some of the results suggest that soluble ionic surfactant and oligomeric and grafted polymeric stabilizers at particle surfaces, collapse to undetectable dimensions during freeze-drying, yet reswell to detectable size during rewetting, if they have not dissolved into polymer particles during. DOI : 10.1007/s11998-008-9095-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9095-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2972
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 5, N° 3 (09/2008) . - p. 271-283[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010633 - Périodique Bibliothèque principale Documentaires Disponible Rôle de la rhéologie dans l'adhésion des adhésifs PSA / Costantino Creton in LES CAHIERS DE RHEOLOGIE, Vol. XVI, N° 1 (10/1998)
[article]
Titre : Rôle de la rhéologie dans l'adhésion des adhésifs PSA Type de document : texte imprimé Auteurs : Costantino Creton, Auteur ; H. Lakrout, Auteur Année de publication : 1998 Article en page(s) : p. 5-10 Note générale : Bibliogr. Langues : Français (fre) Catégories : Adhésifs sensibles à la pression
Déformations (mécanique)
Essais dynamiques
Latex
Matériaux -- Décollements
Polyacrylate de 2-éthylhexyl
RhéologieIndex. décimale : 532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) Résumé : Les mécanismes de décollement d'un adhésif mou de type "pressure-sensitive" sont étudiés à l'aide d'une instrumentation permettant de visualiser les mécanismes de déformation de l'adhésif à l'échelle microscopique pendant l'essai.
La géométrie de l'essai est celle de la traction en couches minces (probe tack) et la forte composante hydrostatique de la contrainte provoque la nucléation et la croissance de cavités à , ou près de, l'interface entre le film d'adhésif et le poinçon rigide. Une fois formées, ces cavités s'étendent d'abord dans le plan du film telles des fissures interfaciales, puis se transforment en fibrilles étirées dans la direction normale au plan du film. L'évolution des cavités lors de l'essai est discutée en fonction des paramètres rhéologiques de l'adhésif dans le cas de latex à base de polyacrylate de 2éthyl hexyle.Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34417
in LES CAHIERS DE RHEOLOGIE > Vol. XVI, N° 1 (10/1998) . - p. 5-10[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21932 - Colloque, congrès, etc. Bibliothèque principale Documentaires Disponible Shear induced structure in an associatively thickened latex investigated using parallel superposition / L. Costello in LES CAHIERS DE RHEOLOGIE, Vol. XV, N° 1 (10/1996)
[article]
Titre : Shear induced structure in an associatively thickened latex investigated using parallel superposition Type de document : texte imprimé Auteurs : L. Costello, Auteur Année de publication : 1996 Article en page(s) : p. 301-306 Note générale : Bibliogr. Langues : Français (fre) Catégories : Epaississants
Latex
RhéologieIndex. décimale : 532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) Résumé : The technique of parallel superposition has been to examine the formation of shear induced structures in an associatively thickened latex. In this technique a sample is subjected to simultaneous shear and oscillatory motions. Associative thickeners rely for their effect as viscosity enhancers by adsorbing onto the surfaces of more than one particle, in manner similar to that of bridging flocculants. It was found that an increase in the shear rate results in an increase in the high frequency limiting value of the storage modulus. This effect is ascribed to the compression or extension of thickener molecules away from their entropically favoured conformations when two dimensional structures are formed under shear. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26154
in LES CAHIERS DE RHEOLOGIE > Vol. XV, N° 1 (10/1996) . - p. 301-306[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 002121 - Périodique Bibliothèque principale Documentaires Disponible Sheen solutions / Philip Green in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4485 (02/2005)
[article]
Titre : Sheen solutions Type de document : texte imprimé Auteurs : Philip Green, Auteur Année de publication : 2005 Article en page(s) : p. 39-41 Langues : Anglais (eng) Catégories : Agents dispersants (chimie)
Antimousse
Charges (matériaux)
Copolymère styrène acrylique
Epaississants
Ester vinylique de l'acide versatique
Latex
Polyacryliques
Polyuréthanes
Résistance à la salissure
Résistance aux taches
Revêtements -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : The author outlines ways in which companies can formulate cost-effective sheen and side sheen products with improved stain resistance and ease of stain removal properties.
Ease of cleaning and stain removal are qualities that are high on the agenda when developing new premium quality decorative coatings. In many markets this attribute is juged by the scrub or wear (how easy or difficult it is to remove or how much film weight is lost after so many abrasion cycles) resistance of the coating (the standards vary from region to region but are normally set as so many % film weight loss after a set number of cycles). However in many markets (e.g. North America, some parts of the Asia Pacific region) this attribute is now being judged differently. It is now important whether or not the paint film is prone to staining (with readily available, common household stains) and whether such stains are easily removed by gentle cleaning.Note de contenu : - EVALUATION
- DRYING TIME BEFORE STAINING
- LATEX TYPE, LEVEL
- LATEX TYPE INDIVIDUALLY : Polyurethane's (PU) - Pure acrylic (PA) - Va veova (VV) - Styrene acrylics (SA)
- AS BLENDS : Pa/pu - Pa/vv - Latex level - Extender type - Dispersant type - Defoamer type, level - Thickener type
- THE FUTUREPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27662
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Code-barres Cote Support Localisation Section Disponibilité 000287 - Périodique Bibliothèque principale Documentaires Disponible Simplification of interior latex paint using biopolymer to replace rheological additives and calcium carbonate extender / Lei Jong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)
[article]
Titre : Simplification of interior latex paint using biopolymer to replace rheological additives and calcium carbonate extender Type de document : texte imprimé Auteurs : Lei Jong, Auteur Année de publication : 2021 Article en page(s) : p. 1603-1612 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biopolymères
Blanc (couleur)
Caractérisation
Dureté (matériaux)
Epaississants
Formulation (Génie chimique)
Granulométrie
Latex
Opacifiants
Opacité (optique)
Produits chimiques -- Suppression ou remplacement
Protéines végétales
Revêtements -- Additifs:Peinture -- Additifs
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Soja et constituants
Transition vitreuseIndex. décimale : 667.9 Revêtements et enduits Résumé : An interior latex paint was simplified by using soy protein (SP) to replace hydroxyl ethyl cellulose (HEC) thickener, rheological modifier, and calcium carbonate. The rheological and solid-state properties of the latex paints were investigated. The SP paint had similar viscosity characteristics as that of the HEC paint for practical applications. Strain sweep experiments show that the SP paint has less antisettling characteristic compared to the HEC paint. The dispersion structure of the SP paint is less flexible than that of the HEC paint, but has similar strength at large strain. The values of storage moduli at very low frequency indicate both the HEC and SP paints have a long-term stability. The SP paint had a slower recovery rate after high shear compared to the HEC paint, indicating that the SP paint will have better leveling, but slightly more sagging during application. The dried SP paint had a greater storage modulus than the HEC paint under ambient temperature. The SP paint also had a higher glass transition temperature, indicating a greater ability of protein to immobilize polymer latex. The magnitude of G′ shows that the SP paint is more rigid than the HEC paint. The hardness test shows that the SP paint had a greater hardness than the HEC paint. Note de contenu : - METHODS : Materials - Preparation of latex paint - Particle size, opacity, and films thickness - Rheology - Characterizations of dried latex paints
- RESULTS AND DISCUSSION : Rheological behavior of the latex paints - Strain- and frequency-dependent modulus - Recovery behaviors - Dynamic mechanical properties of dried latex paints - Opacity of dry paint films
- Table 1 : A white latex paint formulation
- Table 2 : Storage modulus, glass transition temperature, and hardness of the latex paints
- Table 3 : Opacity, whiteness, and coverage of the latex paintsDOI : https://doi.org/10.1007/s11998-021-00514-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00514-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36819
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Code-barres Cote Support Localisation Section Disponibilité 23146 - Périodique Bibliothèque principale Documentaires Disponible Solvent-like performance from emulsion PSAs: advances in water-whitening resistance / Laura J. Donkus in ADHESIVES AGE, Vol. 40, N° 10 (09/1997)
PermalinkSpray applications. Part IV. Compositional influences of HEUR thickeners on the spray and velocity profiles of waterborne latex coatings / Peter T. Elliott in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 4 (12/2007)
PermalinkStress development and film formation in multiphase composite latexes / Kyle Price in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)
PermalinkStructure of vinyl polysiloxane on properties of polyacrylates filmm and its pigment printing application / Qipeng Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 4 (07/2020)
PermalinkA study of acetoacetoxyethyl methacrylate hydrolysis in acrylic latex polymers as a function of pH / Kebede Beshah in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 6 (11/2013)
PermalinkStudy of copolymer latexes with bimodal particle size distribution to improve stain resistance : an overview / Tejas M. Shah in PAINTINDIA, Vol. LIX, N° 5 (05/2009)
PermalinkSurface tension studies in colloidal unimolecular polymers / Ashish Zore in COATINGS TECH, Vol. 18, N° 2 (02/2021)
PermalinkSurfactants in polymers, coatings, inks and adhesives / David Robert Karsa / Oxford [United Kingdom*] : Blackwell publishing (2003)
PermalinkPermalinkSuspension structures and film morphologies of high-solids acrylic-alkyd hybrid binders / M. J. Deriss in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B4 (12/2005)
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PermalinkSynthèse de colloïdes modèles par polymérisation en émulsion de styrène et d'acrylate de N-butyle. Leur utilisation dans des études de rhéologie et de formation de film / Jean-Luc Guillaume / 1985
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PermalinkSynthèse, propriétés et technologie des élastomères / Institut National de Formation et d'Enseignement Professionnel du Caoutchoucs ; Groupe Français d'Etudes et d'Applications des polymères / Strasbourg : GFP (1984)
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PermalinkThe prediction of microemulsion properties : molecular theory and the lattice fluid self-consistent field theory / S. Blagojevic in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 45, N° 1/2008 (01-02/2008)
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PermalinkVeoVa/(meth)acrylate latices : high quality binders for water-borne anti-corrosion primers / M. M. C. P. Slinckx in SURFACE COATINGS INTERNATIONAL, Vol. 78, N° 2 (02/1995)
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