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Interfacial studies of crosslinked polyurethanes ; Part I. quantitative and structural aspects of crosslinked near film-air and film-substrate interfaces in solvent-borne polyurethanes / Anneke M. Kaminski in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 872 (09/1997)
[article]
Titre : Interfacial studies of crosslinked polyurethanes ; Part I. quantitative and structural aspects of crosslinked near film-air and film-substrate interfaces in solvent-borne polyurethanes Type de document : texte imprimé Auteurs : Anneke M. Kaminski, Auteur ; Marek W. Urban, Auteur Année de publication : 1997 Article en page(s) : p. 55-66 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie des surfaces
Cinétique chimique
Evaporation
Hexane
Isocyanates
Polyacrylates
Polymères réticulés
Polyuréthanes
Réticulation (polymérisation)
Revêtements
solvantsIndex. décimale : 667.9 Revêtements et enduits Résumé : One of the reactions leading to the formation of polyurethane (PU) crosslinked networks is the reaction of NCO and OH functionalities. In this study, we examined how crosslinking reactions of hexamethylene diisocyanate isocyanurate and polyacrylate near the film-air (F-A) and film-substrate (F-S) interfaces in urethane coatings may affect crosslink density as well as other network properties. While at the initial stages of the crosslinking reactions, solvent evaporation competes with the urethane network formation and isocyanate consumption changes at various depths from the F-A and F-S interfaces. Quantitative analysis of the NCO consumption as a function of depth showed that the NCO concentrations change from 2.35 x 10-5 to 2.09 x 10-5 M, while going from 0.27 to 1.14 μm. During reaction times not exceeding two to three hours, the NCO consumption at the F-A and F-S interfaces is consumed more rapidly. At low relative humidity conditions, excessive amounts of unreacted NCO exists at both the F-A and F-S interfaces. However, at the extended reaction times, NCO concentration levels at the F-S are greater than at the F-A interface, and the NCO concentration differences can be as high as 3 x 10-5 M. In this study we also examined how crosslinking reactions of hexamethylene diisocyanate (HDI) isocyanurate and polyacrylate near the F-S interfaces in urethane films may affect orientation and distribution of urethane functionalities. Note de contenu : - Sample preparation
- Analytical methods
- Dynamic mechanical thermal analysis measurements (DMTA)
- Solvent specific evaporation rate measurementsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18281
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 872 (09/1997) . - p. 55-66[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003541 - Périodique Bibliothèque principale Documentaires Disponible Introduction of intra- and inter-molecular cross-bonds by mono and bifunctional sulphonyl chlorides in soluble collagen / M. S. Olivannan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)
[article]
Titre : Introduction of intra- and inter-molecular cross-bonds by mono and bifunctional sulphonyl chlorides in soluble collagen Type de document : texte imprimé Auteurs : M. S. Olivannan, Auteur ; Y. Nayudamma, Auteur Année de publication : 1976 Article en page(s) : p. 12-15 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de sulfonyle
Collagène
Dissolution (chimie)
Electrophorèse
Réticulation (polymérisation)
ViscositéIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Collagen was treated with different sulphonyl chlorides and some of the physico-chemical properties of the modified collagen such as viscosity, dissolution temperature and polyacrylamide disc electrophoretic pattern were studied. The monofunctional sulphonyl chlorides increased the viscosity of the collagen solution, probably due to aggregation of molecules facilitated by hydrophobic bonds. However, the very high viscosity observed in the case of disulphonyl chlorides with collagen indicates that inter-molecular cross-links are formed with these reagents. From dissolution temperatures and polyacrylamide gel electrophoretic patterns, it is considered that disulphonyl chlorides can introduce intra- and inter-molecular cross-links in collagen under suitable conditions. Note de contenu : - EXPERIMENTAL : Preparation of soluble collagen - Treatment of soluble collagen with various sulphonyl chlorides - Viscosity measurements - Dissolution temperature - Acrylamide gel electrophoresis
- RESULTS AND DISCUSSION : Viscosity - Dissolution temperature - Polyacrylalide gel electrophoresis
- Table 1 : Relative viscosity of collagen treated with sulphonyl chlorides
- Table 2 : Dissolution temperature of collagen treated with sulphonyl chlorides
- Fig. 1 : Disc electrophoresis sub-unit patterns of collagen
- Fig. 2 : Dis electrophoresis and sub-unit patterns of collagen
- Fig. 3 : Disc electrophoresis sub-unit patterns of collagenEn ligne : https://drive.google.com/file/d/1E2O7vmxkPNuTmBItAYrXh0FY7EQJ677n/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35259
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 12-15[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008596 - Périodique Archives Documentaires Exclu du prêt Investigating the correlation between the curing behavior and properties of acrylic powder coatings / Da Eun Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)
[article]
Titre : Investigating the correlation between the curing behavior and properties of acrylic powder coatings Type de document : texte imprimé Auteurs : Da Eun Lee, Auteur ; Jae Jun Lee, Auteur ; Han-Jung Cho, Auteur ; Jin Seok Lee, Auteur Année de publication : 2023 Article en page(s) : p. 1039-1052 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Calorimétrie
Essais (technologie)
Polyacryliques
Réticulation (polymérisation)
Revêtements organiques
Revêtements poudreIndex. décimale : 667.9 Revêtements et enduits Résumé : Acrylic powder coatings are environmentally friendly, solvent-free solid coatings with excellent durability and corrosion resistance that protect substrates from corrosive environments. The curing behavior of acrylic powder coatings affects the coating film properties. In this study, a catalyst was used to control the curing conversion rate, and the curing characteristics and physical properties were compared for coatings with and without the catalyst. Differential scanning calorimetry and an isoconversional method were used to obtain activation energies, and the conversion rate under different isothermal conditions was computed. Notably, complete curing could not be achieved without the catalyst; however, the catalyst-containing coating was entirely cured. With sufficient curing established, the addition of the catalyst was found to increase the adhesion, impact resistance, and corrosion resistance. However, the recoatability was reduced owing to a lack of unreacted monomers on the surface of the catalyst-containing coating film, as verified by Fourier-transform infrared spectroscopy. In general, the addition of a catalyst to acrylic powder coatings enabled complete curing and enhanced most physical properties, offering an improved formulation for applications across high-corrosion environments. Note de contenu : - EXPERIMENTAL METHODS : Sample preparation - Differential scanning calorimetry measurements - Property evaluation
- RESULTS AND DISCUSSION : Curing characteristics of acrylic powder coating - Property test results
- Table 1 : Composition and content of acrylic powder coating
- Table 2 : Adhesion grades
- Table 3 : Activation energies, curing times, and glass transition temperatures for various degrees of conversion
- Table 4 : Kinetic parameters in the autocatalytic model
Property test results
- Table 5 Property testing resultsDOI : https://doi.org/10.1007/s11998-022-00722-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00722-x.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39446
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Code-barres Cote Support Localisation Section Disponibilité 24069 - Périodique Bibliothèque principale Documentaires Disponible Investigation of the effect of precoalescence or postcoalescence crosslinking on film formation, properties, and latex morphology / Ravi G. Joshi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 1 (03/2009)
[article]
Titre : Investigation of the effect of precoalescence or postcoalescence crosslinking on film formation, properties, and latex morphology Type de document : texte imprimé Auteurs : Ravi G. Joshi, Auteur ; Frank N. Jones, Auteur ; Weidian C. Shen, Auteur ; Wenjing Mao, Auteur ; Paul D. Ziemer, Auteur ; Theodore Provder, Auteur Année de publication : 2009 Note générale : Erratum in Journal of coating technology and research Vol. 7, N° 4, p. 529-530 - Bibliogr. Langues : Américain (ame) Catégories : Coalescence (Sciences physiques)
Contraintes (mécanique)
Formation de film
Indentation des matériaux
Latex
Morphologie (matériaux)
Réticulation (polymérisation)
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : Latexes have many product applications including functioning as a binder in coatings. For many years, coatings researchers in industry as well as in academe have been exploring various modes of crosslinking latexes. Quite often, the goal of preparing crosslinked latexes is to upgrade film properties relative to the film properties of uncrosslinked latexes. In the present report, the synthesis and properties of crosslinkable acrylic latexes prepared with either an internal crosslinker (1,3-butylene glycol dimethacrylate)—"precoalescence crosslinking"—or an external crosslinker (adipic dihydrazide)—"postcoalescence crosslinking"—at various levels of crosslinking were studied. For postcoalescence crosslinking, diacetone acrylamide was copolymerized into the latex to provide sites for subsequent reaction with adipic dihydrazide. Fundamental properties of films cast from the two types of latexes were systematically compared. These properties included gel content, dynamic mechanical properties, nano-indenter hardness and modulus, stress–strain properties as well as the characterization of latex morphology by atomic force microscopy (AFM). In addition, some specific end-use properties were determined. This study assesses the effect of type (precoalescence or postcoalescence) and level of crosslinking on the film formation process and the resulting fundamental and end-use properties as well as resulting latex film morphology. DOI : 10.1007/s11998-008-9115-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9115-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4859
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 1 (03/2009)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011246 - Périodique Bibliothèque principale Documentaires Disponible 011271 - Périodique Bibliothèque principale Documentaires Disponible Investigation of the effects of formulation on selected properties of UV curable IPN coatings / L. N. Price in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 885 (10/1998)
[article]
Titre : Investigation of the effects of formulation on selected properties of UV curable IPN coatings Type de document : texte imprimé Auteurs : L. N. Price, Auteur ; R. A. Ryntz, Auteur ; X. H. Li, Auteur ; A. H. Huetos, Auteur ; H. X. Xiao, Auteur ; K. C. Frisch, Auteur ; B. Suthar, Auteur Année de publication : 1998 Article en page(s) : p. 151-156 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère uréthane acrylique
Formulation (Génie chimique)
Photoamorceurs (chimie)
Polyaddition
Réseaux polymères
Réticulation (polymérisation)
Revêtements
Revêtements -- Séchage sous rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : Ultraviolet curable coatings based on urethane-acrylic resins were prepared by free radical polymerization. The effects of photoinitiators on the curing reaction and the influence of polyol types and dimethylopropionic acid (DMPA) amounts on the properties of UV curable coatings prepared by free radical polymerization (UVF) were investigated. The effects of polymerization (UVC) and the consequences of postcuring conditions on the properties of UVC were evaluated. The interpenetrating polymer network (IPN) containing UV curable coatings (UVIPN), which were composed of UVF and UVC at different ratios (by weight), were prepared. The properties of UVIPN with varied UVF/UVC ratios were studied. Note de contenu : - EXPERIMENTAL : Raw materials - Preparation of free radical UV curable coatings based on urethane-modified acrylics - Preparation of cationic UV curable coatings based on epoxy - Preparation of IPN UV curable coatings - Measurement of properties
- RESULTS : Free radical UV curable coatings based on urethane-modified acrylics - Cationic UV curable coatings based on epoxy - UV curable IPN coatings based on free-radical and cationic UV curable mechanismsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18045
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Code-barres Cote Support Localisation Section Disponibilité 003554 - Périodique Bibliothèque principale Documentaires Disponible Irradiation opens up third film dimension / Dietmar Drummer in KUNSTSTOFFE INTERNATIONAL, Vol. 100, N° 11 (11/2010)
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PermalinkLatent amine addresses needs for one-package epoxy adhesives / Dilip N. Shah in ADHESIVES AGE, Vol. 40, N° 13 (12/1997)
PermalinkLeather solid waste : a review. A low cost adsorption material based on collagen fibre / Qiang Taotao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)
PermalinkLighting the way forward : radcure developments / Sandy Morrison in SURFACE COATINGS INTERNATIONAL, Vol. 95, 1 (02/2012)
PermalinkLink lock : an explanation of the chemical stabilisation of collagen / Anthony D. Covington in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 1 (01-02/2008)
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PermalinkLow molecular weight polyisoprenes offer versatility in bonding techniques / Thomas Meeker in ADHESIVES AGE, Vol. 41, N° 7 (07/1998)
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