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Novel chlorinated film formers for high performance coatings / S. Bhandari in PAINTINDIA, Vol. XLV, N° 7 (07/1995)
[article]
Titre : Novel chlorinated film formers for high performance coatings Type de document : texte imprimé Auteurs : S. Bhandari, Auteur ; S. Chandra, Auteur Année de publication : 1995 Article en page(s) : p. 19-35 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture Liant 'Polymère chlore' 'Résine alkyde' Préparation Chloration 'Huile soja' 'Corps gras végétal' époxyde' 'Polyacrylate de butyle' 'Copolymère acrylate méthacrylate méthyle' 'Propriété thermique' mécanique' chimique' Feuil 'Article synthèse' Index. décimale : 667.9 Revêtements et enduits Résumé : Chlorinated alkyds, epoxy esters and butyl acrylate-méthyl methacrylate (BA-MMA) copolymers were synthesised by bubbling dry chlorine gas in carbon tetrachloride solution. The chlorination of DCO alkyd was studied both in the absense as well as in the presence of iodine catalyst. Soybean and nigerseed oil alkyds and linsseed oil epoxy ester were, however, chlorinated without catalyst only. The chlorination of BA-MMA copolymer was performed in the presence of UV light.
It was found that the maximum chlorine content of about 50-55 per cent could be achieved in DCO, soybean and nigerseed oil alkyds and linseed oil epoxy ester. Five samples each of chlorinated DCO, soybean and nigerseed oil alkyds and four samples of chlorinated epoxy ester, varying in the chlorine content, were synthesized in order to study the effect of chlorine. In the case of BA-MMA copolymer maximum chlorine content about 26 per cent was obtained. One more sample of chlorinated BA-MMA copolymer, with lesser chlorine content, was synthesized for comparison purposes.
It was confirmed through IR spectroscopy that chlorine enters only into the aliphatic portions of all the three alkyds and epoxy ester molecules by addition and substitution reactions and only into the aliphatic main chain of the BA-MMA copolymer molecule by substitution reaction.
Thermal stability of all the chlorinated products was determinated by the Bloomfield test and by the weight loss procedure and compared with that of the commercial sample of chlorinated rubber. It was found that the termal stability increases with the chlorine content. In the case of chlorinated BA-MMA copolymers, the thermogravimetric analysis (T.G.A) was also carried out which further confirmed that the thermal stability increases with the chlorine content.
All the products were characterized for sulubility, compatibility, colour viscosity, iodine value, epoxide equivalent and molecular weight. The mechanical and chemical film properties were also appraised simultaneously which revealed that, in general, the cholorinated products possessed superior film properties as compared to those of the unchlorinated ones expect in terms of flexibility and adhesion and solvent resistance.
All the chlorinated products also passed the standard tests for protection against corrosion and resistance to salt-spray and fire, justifying their application in high performance coatings.Note de contenu : - Important materials
- Chlorinated DCO alkyds : Preparation of alkyd - Chlorination - Samples prepared
- Chlorinated soybean oil alkyds : Preparation of alkyd - Chlorination - Samples prepared
- Chlorinated nigerseed oil alkyds : Preparation of alkyd - Chlorination - Samples prepared
- Chlorinated epoxy esters : Preparation of epoxy ester - Chlorination - Samples prepared
- Chlorinated acrylics : Preparation of poly (butyl acrylate) - Chlorination - Preparation of chlorinated butyl acrylate-methyl methacrylate (BA-MMA) copolymer - Sample prepared
- Characterization : Solubility and compatibility - Colour - Viscosity - Addition/substitution of chlorine - Thermal stability
- Evaluation : Drying time - Flexibility and adhesion - Impact resistance - Scratch hardness - Water, acid and alkali resistance - Solvent resistance - Protection against corrosion - Resistance to salt-spray - Fire resistancePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13620
in PAINTINDIA > Vol. XLV, N° 7 (07/1995) . - p. 19-35[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006454 - Périodique Bibliothèque principale Documentaires Disponible Measurement approaches to develop a fundamental understanding of scratch and mar resistance / Mark R. van Landingham in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 1, N° 4 (10/2004)
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Titre : Measurement approaches to develop a fundamental understanding of scratch and mar resistance Type de document : texte imprimé Auteurs : Mark R. van Landingham, Auteur ; Li-Piin Sung, Auteur ; Neng-Kai Chang, Auteur ; Tsun Yen Wu, Auteur ; Shuo-Hung Chang, Auteur ; Vincent Jardret, Auteur Année de publication : 2004 Article en page(s) : p. 257-266 Note générale : Bibliogr. Langues : Américain (ame) Tags : Propriété mécanique Etude expérimentale Viscoélasticité Modélisation comparative Microscopie confocale Indentation Méthode mesure Résistance rayure Dureté Méthacrylate de méthyle polymère Epoxyde résine Index. décimale : 667.9 Revêtements et enduits Résumé : Instrumented indentation and confocal microscopy were used to characterize the surface mechanical response of polymeric materials. Viscoelastic behavior was measured using instrumented indentation. A model based on the contact between a rigid probe and a viscoelastic material was used to calculate values for the creep compliance and stress relaxation modulus for two polymeric materials, epoxy and poly(methyl methacrylate) or PMMA. Scratch testing was performed on these materials with various probes under a variety of conditions, and confocal microscopy was used to characterize the resulting deformation. Relationships among viscoelastic behavior, scratch damage, and appearance are currently being explored using these methods along with finite element modeling. DOI : 10.1007/s11998-004-0028-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0028-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3857
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 1, N° 4 (10/2004) . - p. 257-266[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000588 - Périodique Bibliothèque principale Documentaires Disponible Metrology for characterizing scratch resistance of polymer coatings / Li-Piin Sung in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 8 (10/2005)
[article]
Titre : Metrology for characterizing scratch resistance of polymer coatings Type de document : texte imprimé Auteurs : Li-Piin Sung, Auteur ; Shuo-Hung Chang, Auteur ; Tsun Yen Wu, Auteur ; Mark R. van Landingham, Auteur ; Peter L. Drzal, Auteur Année de publication : 2005 Article en page(s) : p. 583-589 Note générale : Bibliogr. Langues : Américain (ame) Tags : Microscopie confocale laser balayage Oléfine polymère Propriété esthétique Etude expérimentale Mesure optique Durabilité Dureté Méthacrylate de méthyle Déformation plastique surface Morphologie mécanique Brillant Matériau revêtement Propène Résistance rayure Index. décimale : 667.9 Revêtements et enduits Résumé : Current methods for scratch resistance assessment are often based on "relative but not quantitative" types of measurements, such as visual inspection, gloss changes, and changes in gray scale level or lightness. Most results are used for qualitative assessment purposes, which result in the lack of a repeatable and reliable standardized test method for the polymer materials community. To implement a scientifically based standardized test method for quantifying scratch resistance, it is vital to understand the relationships between material mechanical properties, morphology, and appearance (optical properties) of surface and subsurface deformation. In this article, preliminary results from a scratch testing protocol to identify the "onset" of plastic deformation in poly(methyl methacrylate) and poly(propylene) commercial samples are presented. Recent advances in optical scattering measurements to identify the onset of plastic deformation by analyzing specular and off-specular intensities are also presented. DOI : 10.1007/BF02774587 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02774587.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3783
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 8 (10/2005) . - p. 583-589[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003121 - Périodique Bibliothèque principale Documentaires Disponible UV-visible technique for studying powder coatings and their dissolution / Önder Pekcan in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 923 (12/2001)
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Titre : UV-visible technique for studying powder coatings and their dissolution Type de document : texte imprimé Auteurs : Önder Pekcan, Auteur ; Ertan Arda, Auteur Année de publication : 2001 Article en page(s) : p. 51-60 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude expérimentale Spectrométrie UV visible Recuit Traitement thermique Heptane Chloroforme Solvant organique Dissolution Méthacrylate de méthyle polymère Latex Formation film Peinture poudre Matériau revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : UV-Visible (UVV) technique was used to monitor powder coating and its dissolution processes from hard latex particles. Three sets of latex coatings were prepared from poly(methyl methacrylate) (PMMA) particles. The first set of coatings was annealed at elevated temperatures in various time intervals during which reflected photon intensity, Irf, was measured. The second set of coatings was annealed at various temperatures in 10 min time intervals during which transmitted intensity, Itr, was measured. Irf first decreased and then increased as the annealing temperature was increased. Decrease in Irf was explained with the void closure mechanism due to viscous flow. Increase in Itr and Irf against time and temperature were attributed to an increase in crossing density at the junction surface. The activation energy of viscous flow, delta H, was measured and found to be around 8 kcal/mol and the back and forth activation energies (delta Erf and delta Etr) were measured and found to be around 49 and 53 kcal/mol for a reptating polymer chain across the junction surface. Diffusion of solvent molecules (chloroform) into the annealed latex coatings was followed by desorption of PMMA chains for the third set of films. Desorption of pyrene, P, labeled PMMA chains was monitored in real-time by the absorbance change of pyrene in the polymer-solvent mixture. A diffusion model with a moving boundary was employed to quantify real-time UVV data. Diffusion coefficients of desorbed PMMA chains were measured and found to be between 2 and 0.6 x 10-11 cm2 s-1 in the 100 and 275°C temperature range. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5771
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 923 (12/2001) . - p. 51-60[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001231 - Périodique Bibliothèque principale Documentaires Disponible Associative polymer/latex dispersion phase diagrams. II : HASE thickeners / Edward Kostansek in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 6 (04/2005)
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Titre : Associative polymer/latex dispersion phase diagrams. II : HASE thickeners Type de document : texte imprimé Auteurs : Edward Kostansek, Auteur Année de publication : 2005 Article en page(s) : p. 417-422 Note générale : Bibliogr. Langues : Américain (ame) Tags : Stabilité colloïdale Polymère associatif Propriété thermodynamique Etude expérimentale Peinture Application Effet concentration Dispersion Groupe hydrophobe latéral Méthacrylate de méthyle copolymère aqueuse Acrylate butyle Epaississant Polyélectrolyte d'éthyle Méthacrylique acide Dimension particule Matériau revêtement Floculation Agent surface Diagramme phase Latex Index. décimale : 667.9 Revêtements et enduits Résumé : The colloidal interactions ofHASE associative polymers and latexes in the presence of surfactant are complicated and subject to a number of variables. Both bridging and depletion flocculation can occur, in addition to good particle dispersion. Dispersion phase diagrams have been developed to help visualize these interactions. The various dispersion states can have a significant effect on coating formulations and film properties. Examples of dispersion phase diagrams are presented for a model HASE anionic associative thickener and various model latexes in the presence of sodium dodecylsulfate and nonionic surfactants. The major variables affecting dispersion behavior are associative polymer concentration, latex particle size, latex surface hydrophobicity, electrolyte concentration, and surfactant concentration. The dispersion phase behavior of the HASE systems is compared to that of HEUR thickened systems reported previously. A significant difference is that much less bridging flocculation is observed in the HASE systems. In addition, nonionic surfactants induced depletion flocculation in the HASE systems but not in the HEUR systems. DOI : 10.1007/BF02733884 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02733884.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3836
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 6 (04/2005) . - p. 417-422[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001483 - Périodique Bibliothèque principale Documentaires Disponible Latex produced with carboxylic acid comonomer for waterborne coatings : Particle morphology variations with changing pH / Daisuke Fukuhara in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 7 (07/2005)
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