11 résultat(s) recherche sur le tag 'Solution'

Macroscopic Pipe Flow of Micellar Solutions Investigated by Ultrasound Doppler Velocimetry / Peter Fischer in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 46, N° 3/2009 (05-06/2009)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 3/2009 (05-06/2009) . - p. 140-144 Titre : Macroscopic Pipe Flow of Micellar Solutions Investigated by Ultrasound Doppler Velocimetry Type de document : texte imprimé Auteurs : Peter Fischer, Auteur ; Boris Ouriev, Auteur ; Erich J. Windhab, Auteur Année de publication : 2009 Article en page(s) : p. 140-144 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement cisaillé Ecoulement instationnaire (dynamique des fluides) Fluides, Mécanique des Micelles Rhéologie Solutions (chimie) Surfactants Vélocimétrie Viscoélasticité Tags : Equimolar  viscoelastic  surfactant  solution  Non-linear  flow  response  Shear-banding  structure  Flow  instabilities  Ultrasound  doppler  velocimetry Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Macroscopic flow properties of viscoelastic surfactant solution are investigated in pressure driven pipe flow condition. We focus on an equimolar aqueous solution of cetylpyridinium chloride – sodium salicylate, which in simple shear flow exhibits a shear thinning, and at higher shear rates, a pronounced shear-thickening behavior associated with the formation of shear bands [1–6]. An ultrasound Doppler velocimetry method is used to detect these shear bands in pipe flow. The emitted ultrasonic beam is scattered by the moving sample and the time delay between emitted pulse and received echoes as well as the frequency shift is determined. This Doppler shift is related to the speed and the direction of the moving scatters and with this information, the velocity profile across the pipe is calculated [7]. The shape of the obtained velocity profile is used to determine the flow properties of the sample and the formation of shear bands at the tube's wall or within the bulk phase. For the investigated solution we do not observe shear band phenomena. This is contrary to previous investigations [5, 6, 8] where shear bands in the order of few tenth of a millimeter were found. Our results suggesting that the banded region is not detectable by the utilized UVP technique. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5438 [article]

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Synthesis of acrylic resins for high-solids coatings by solution and separation polymerization / Constantinos D. Diakoumakos in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 908 (09/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 908 (09/2000) . - p. 61-70 Titre : Synthesis of acrylic resins for high-solids coatings by solution and separation polymerization Type de document : texte imprimé Auteurs : Constantinos D. Diakoumakos, Auteur ; Qi Xu, Auteur ; Frank N. Jones, Auteur ; Jamil A. Baghdachi, Auteur Année de publication : 2000 Article en page(s) : p. 61-70 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  haute  teneur  solide  Vernis  Liant  Acrylique  dérivé  polymère  Préparation  Polymérisation  radicalaire  solution  Caractérisation  Etude  expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : Conventional solution polymerization under monomer-starved conditions was compared with separation polymerization, also known as monomer-starved, as a method for making acrylic resins with low polydispersity (D=Mw/Mn). Separation polymerization employs aliphatic or cycloaliphatic solvents that are good solvents for the monomers but poor solvents for the resin; thus, the resin separates during polymerization. Various process conditions, initiators, chain-transfer agents, and solvents were studied, focusing mainly on a monomer line-up of methyl methacrylate, styrene, ethyl acrylate, and 2-hydroxy ethyl methacrylate in a 15/15/40/30 weight ratio. Two initiators, t-amyl peroxy 2-ethyl hexanoate and t-butyl peroxy 2-ethyl hexanoate gave about equal, excellent results. 2-Mercapto ethanol was selected as a chain transfer agent. With these ingredients, the separation polymerization method is capable of producing oligomeric acrylic polyol resins with polydispersities (D) of about 1.7 to 1.8 when Mn is in the range 1350 to 1600. These resins have substantially lower solution viscosities than a commercial benchmark resin, which has Mn=1230 and D=2.03. In preliminary tests of 2K polyurethane coatings, the film properties obtained with acrylics made by separation polymerization were, on balance, superior to those obtained with a commercial benchmark resin. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5788 [article]

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Cerium acetate-modified aminopropylsilane triol : A precursor of corrosion-preventing coating for aluminum-finned condensers / T. Sugama in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 8 (10/2005)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 8 (10/2005) . - p. 649-659 Titre : Cerium acetate-modified aminopropylsilane triol : A precursor of corrosion-preventing coating for aluminum-finned condensers Type de document : texte imprimé Auteurs : T. Sugama, Auteur Année de publication : 2005 Article en page(s) : p. 649-659 Note générale : Bibliogr. Langues : Américain (ame) Tags : Propriété  thermique  Etude  expérimentale  Corrosion  sel  Protection  corrosion  Stabilité  Effet  concentration  Polycondensation  solution  Préparation  Acier  Aluminium  Couche  protectrice  anticorrosion  Cérium  Acétate  Inhibiteur  Amine  polymère  Siloxane  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : A poly-acetamide-acetoxyl methyl-propylsiloxane (PAAMPS) polymer containing a cerium (Ce) oxide derivative was synthesized through three spontaneous reactions: condensation, amidation, and acetoxylation. The PAAMPS synthesizing took place between the Ce acetate dopant and aminopropylsilane triol (APST) as the film-forming precursor aqueous solution at 150°C. PAAMPS was evaluated for use as a corrosion-preventing coating for air-cooled condensers consisting of two metal components : aluminum fins and carbon steel tube. The key factors to ensuring the maximum performance of the PAAMPS/Ce oxide coating system in mitigating the corrosion of both aluminum and steel included (1) minimizing the content of non-reacted water-soluble APST and Ce acetate remaining in the coating, (2) lowering the susceptibility of the coating's surface to moisture, (3) precipitating a passive Ce3+ oxide (Ce2O3( film insensitive to Cl dissolution over the metal's surfaces, and (4) possessing excellent adhesion to the metal's surfaces. The combination of these factors considerably decreased the rate of the cathodic oxygen reduction reaction at the corrosion site of the metals. In fact, the corrosion rate, measured in milli-inches per year (mpy), of bare steel was reduced more than one order of magnitude by applying this coating. Correspondingly, the coating extended the useful lifetime of steel exposed in a salt-fog chamber at 35°C from only ~10 hr to ~768 hr. Furthermore, tins coating system far better protected an aluminum substrate from the corrosion than it did one of steel. Even a very thin nanoscale coating film deposited on the aluminum's surfaces reduced the corrosion rate, (mpy), by nearly two orders of magnitude over that of the bare aluminum. Also, the salt-spray resistance of aluminum panels covered by this nanoscale film was strikingly extended to more than 1440 hr, compared with -40 hr for bare aluminum. DOI : 10.1007/BF02774594 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02774594.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3790 [article]

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Decomposable crosslinking paint : Waste minimization / Y. Nakayama in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 900 (01/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 900 (01/2000) . - p. 57-62 Titre : Decomposable crosslinking paint : Waste minimization Type de document : texte imprimé Auteurs : Y. Nakayama, Auteur Année de publication : 2000 Article en page(s) : p. 57-62 Note générale : Bibliogr. Langues : Américain (ame) Tags : Peinture  Feuil  Enlèvement  Polymère  réticulé  Décomposition  chimique  Au  trempé  Solution  Récupération  déchet Index. décimale : 667.6 Peintures Résumé : A paint film crosslinked by a reaction between a carbonyl group and a hydrazide group could be easily decomposed by dipping it in a solution containing water, solvents, and acids. The method was studied to minimize the waste produced by the elimination of the decomposable paint film. This was performed in two steps: a dipping in aqueous solution containing solvents and acids, and a successive wash with solvents. Decomposition of the crosslinking bonds and the elution of the decomposed free crosslinker took place in the first dipping process, and the elimination of the decomposed resins in the second washing process. The aqueous solution could be used for a long time without contamination by the decomposed resins, and the decomposed resin could easily be recovered from the resin solution containing no other contaminants. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5853 [article]

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001205	-	Périodique	Bibliothèque principale	Documentaires	Disponible

New polymeric polyol for thermoset coatings / J. Frederic Walker in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 928 (05/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 928 (05/2002) . - p. 33-47 Titre : New polymeric polyol for thermoset coatings : Superacid-catalyzed copolymerization of water and epoxy resins Type de document : texte imprimé Auteurs : J. Frederic Walker, Auteur ; John B. Dickenson, Auteur ; Charles R. Hegedus, Auteur ; Frank R. Pepe, Auteur ; Renee Keller, Auteur Année de publication : 2002 Article en page(s) : p. 33-47 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Feuil  Propriété  mécanique  physique  chimique  Polymérisation  solution  Ether  Bisphénol  A  Eau  Copolymérisation  émulsion  Polyol  Superacide  Catalyse  acide  Epoxyde  résine  Liant  Formulation  Thermodurcissable  Peinture  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Though free-radical emulsion polymerization has been studied extensively, published reports of cationic (i.e., acid-catalyzed) polymerizations of emulsified monomers are rare. It was recently discovered that treatment of an emulsion of liquid epoxy resin with select superacid catalysts yields a polymeric polyol. Catalysis with one percent perchloric acid at room temperature yields a product with a number average molecular weight of 1650, and a polydispersity of 5.0 as measured by GPC. The polyol's structure differs from that of conventional high molecular weight epoxy resins prepared by the advancement process in several ways, including the incorporation of two glycidyl units in the repeat unit. In essence, the product is a copolymer of the epoxy resin and water, in which water is incorporated in the repeat unit structure by reaction with two epoxide groups. A similar product can be prepared by solution polymerization, where the molecular weight is controlled by the ratio of water to epoxy resin. The product was shown to have lower levels of residual bisphentol-A diglycidyl ether (BADGE) and bisphenol-A than conventional advanced epoxy resins. Polyols prepared by these new processes were crosslinked with melamine-formaldehyde resins in waterborne coating formulations which were free of added cosolvent, as well as solventborne coating formulations. The coatings de veloped excellent solvent resistance at lower bake temperatures than traditional epoxy resins. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5648 [article]

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A perspective on the history of and current research in surfactant-modified, water-soluble polymers / J. Edward Glass in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 913 (02/2001)

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Tailoring HASE rheology through polymer design : Effects of hydrophobe size, acid content, and molecular weight / Wenjun Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 6 (04/2005)  

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A new rheometer for the extensional properties of viscoelastic liquids / D. Della Valle in LES CAHIERS DE RHEOLOGIE, Vol. XV, N° 4 (10/1997)

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On the presence of loops in linear self-assembling systems. Statistical methods and Brownian dynamics / Martin Kröger in LES CAHIERS DE RHEOLOGIE, Vol. XV, N° 4 (10/1997)

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Qualité de l'eau. Détermination de l'azote nitreux et de l'azote nitrique et de la somme des deux par analyse en flux (CFA et FIA) et détection spectrométrique - Norme NF EN ISO 13395 / Association Française de Normalisation (Paris) / Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) (1996)

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Solvent blends based on dipropylene glycol dimethyl ether for the production of alkyd and polyester resins by the azeotropic process / Felipe A. Donate in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 902 (03/2000)

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