Linear glycidyl carbamate (GC) resins for highly flexible coatings / Umesh D. Harkal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 2 (03/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 2 (03/2013) . - p. 141-151 Titre : Linear glycidyl carbamate (GC) resins for highly flexible coatings Type de document : texte imprimé Auteurs : Umesh D. Harkal, Auteur ; Andrew J. Muehlberg, Auteur ; Dean C. Webster, Auteur Année de publication : 2013 Article en page(s) : p. 141-151 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbamate de glycidyle Epoxydes Polyuréthanes Revêtements:Peinture Souplesse (mécanique) Index. décimale : 667.9 Revêtements et enduits Résumé : An approach to the design of highly flexible coatings based on glycidyl carbamate (GC) chemistry is presented. In past work, GC resins had been synthesized by reacting polyisocyanates such as hexamethylene diisocyanate biuret or hexamethylene diisocyanate isocyanurate resins with glycidol. When crosslinked with amines, due to their high functionality, these resins form very hard and tough coatings, but the coatings have limited flexibility. To obtain coatings with good flexibility, several GC resins were synthesized using linear and cycloaliphatic diisocyanates and a combination of diols and triol with glycidol. The combination of linear diisocyanates and diols introduces a more linear structure in the GC resin compositions. Crosslinked coatings were obtained using two amine crosslinkers, para-aminocyclohexyl methane (PACM) and a commercial polyamide, Ancamide-2353 (A-2353). The flexibility of the coatings was characterized using reverse impact test, GE impact test, and elongation at break in tensile test. The coatings were further characterized to determine their chemical resistance, hardness, thermal stability, and corrosion resistance. The diisocyanate composition and composition of diols and triol influenced the performance of the coatings. In order to understand the influence of the composition of the GC resins on their performance, coatings were characterized using differential scanning calorimetry and dynamic mechanical analysis. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of glycidyl carbamate functional resins - NCO titration - Characterization - Coating preparation - Coating performance - Differential scanning calorimetry (DSC) - Thermogravimetric analysis (TGA) - Dynamic mechanical analysis (DMA) - Tensile test - Salt spray test (ASTM B 117) - RESULTS AND DISCUSSION : Synthesis of GC resins based on diisocyanates and diols - Initial screening of coating based on impact and solvent resistance - Further analysis of properties of the screened coatings - Dynamic mechanical analysis - Thermal stability - Salt spray test DOI : 10.1007/s11998-012-9415-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9415-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18230 [article]

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Novel water-dispersible glycidyl carbamate (GC) resins and waterborne amine-cured coatings / Umesh D. Harkal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 6 (11/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 6 (11/2011) . - p. 735-747 Titre : Novel water-dispersible glycidyl carbamate (GC) resins and waterborne amine-cured coatings Type de document : texte imprimé Auteurs : Umesh D. Harkal, Auteur ; Andrew J. Muehlberg, Auteur ; Peter A. Edwards, Auteur ; Dean C. Webster, Auteur Année de publication : 2011 Article en page(s) : p. 735-747 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbamate de glycidyle Epoxydes Hydrophilie Monte-Carlo, Méthode de Polyuréthanes Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Water-dispersible glycidyl carbamate (GC) functional resins were synthesized and crosslinked using a water-dispersible amine to form coatings. GC functional resins are synthesized by the reaction of an isocyanate functional compound with glycidol to yield a carbamate (urethane) linkage (–NHCO–) and reactive epoxy group. The combination of both functionalities in a single resin structure imparts excellent mechanical and chemical properties to the coatings. Previous studies on the development of GC coatings have focused on solvent-borne coating systems. In this study, GC resins were modified by incorporating nonionic hydrophilic groups to produce water-dispersible resins. To determine the influence of the content of hydrophilic groups on dispersion stability, aqueous dispersions were made from a series of hydrophilically modified GC resins and characterized for particle size and dispersion stability. The composition of a typical, dispersed GC resin particle was predicted using Monte Carlo simulations. Stable GC dispersions were used to prepare amine-cured coatings. The coatings were characterized for solvent resistance, water resistance, hardness, flexibility, adhesion, and surface morphology. It was observed that GC resins were able to be dispersed in water without using any surfactant and by minimal mixing force (hand mixing) and produced coating films with good properties when crosslinked with a compatible waterborne amine crosslinker. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of mPEG-modified GC resins - Characterization - Coating formulation preparation - Coating performance - Differential scanning colorimetry (DSC) - Thermogravimetric analysis (TGA) - Dynamic mechanical analysis (DMA) - Atomic force microscope (AFM) - Salt spray test - RESULTS AND DISCUSSION : Synthesis of water-dispersible GC resins - Dispersion stability - Coating formulations - Water and solvent resistance - Water contact angle - Other coating properties - Further analysis of the coating properties - Thermal stability - Salt spray test DOI : 10.1007/s11998-011-9356-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9356-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12600 [article]

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Preliminary investigation of the impact of polymer composition on electrochemical properties of coatings as determined by electrochemical impedance spectroscopy / Vinod Upadhyay in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 6 (11/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 6 (11/2013) . - p. 865-878 Titre : Preliminary investigation of the impact of polymer composition on electrochemical properties of coatings as determined by electrochemical impedance spectroscopy Type de document : texte imprimé Auteurs : Vinod Upadhyay, Auteur ; Umesh D. Harkal, Auteur ; Dean C. Webster, Auteur ; Gordon P. Bierwagen, Auteur Année de publication : 2013 Article en page(s) : p. 865-878 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbamate de glycidyle Matériaux -- Propriétés fonctionnelles Polymères Relations structure-propriétés Revêtements:Peinture Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : The influence of structural and systematic compositional variations in glycidyl carbamate (GC) functional polymers on the electrochemical properties of their coatings was studied. There are few reports which focus on the correlation of structural and compositional variations in polymer films with their electrochemical barrier properties, diffusion properties with regards to water and aqueous electrolytes, and corrosion performance. To begin to fill this knowledge gap, two sets of GC functional polymers were studied. The polymer compositions were designed to vary the extent of polar hydrophilic groups, non-polar hydrophobic groups, and reactive epoxy groups in the final coatings. Impedance responses of the coatings were found to be closely related to the structural and compositional variations of these GC polymer films. In addition, single frequency EIS experiments were used in an attempt to understand the water uptake behavior of these polymer films using NaCl solution and ionic liquid under immersed condition. The resulting transport property data of the films was correlated to their polymer structure and composition. Moreover, a novel attempt at ranking the stability of coating using capacitance measurement during a cyclic wetting–drying condition was also attempted. The information obtained from this work can potentially be used to optimize the polymer for the specific performance properties needed in the protective coating applications, saving significant time and effort in the research and development stage. Note de contenu : - EXPERIMENTAL : M series GC resins - Coating preparation and film formation - Electrochemical impedance spectroscopy - RESULTS AND DISCUSSION : M series GC coatings : electrochemical characterization - Coating stability characterization by single frequency EIS - L series GC coatings : electrochemical characterization - Coating stability characterization by cyclic wetting-drying single frequency EIS capaticance measurement DOI : 10.1007/s11998-013-9497-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9497-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19826 [article]

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The influence of structural modification and composition of glycidyl carbamate resins on their viscosity and coating performance / Umesh D. Harkal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 5 (09/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 5 (09/2010) . - p. 531-546 Titre : The influence of structural modification and composition of glycidyl carbamate resins on their viscosity and coating performance Type de document : texte imprimé Auteurs : Umesh D. Harkal, Auteur ; Aaron J. Muehlberg, Auteur ; Jung Li, Auteur ; James T. Garrett, Auteur ; Dean C. Webster, Auteur Année de publication : 2010 Article en page(s) : p. 531-546 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Revêtements:Peinture Tags : 'Résine  de  carbamate  glycidyl'  Uréthane  Epoxy  Revêtement  'Rapports  structure-propriété' Index. décimale : 667.9 Revêtements et enduits Résumé : The synthesis, characterization, and coatings performance of a series of glycidyl carbamate (GC) resins synthesized from a hexamethylene diisocyanate biuret resin, glycidol, and alcohols were explored. The partial replacement of glycidol with alcohols was explored as a way to reduce the viscosity of multifunctional GC resins. Six modified GC resins were obtained by replacing one-third of the glycidol with alcohols and ether alcohols. The modified GC resins were characterized using FTIR and 13C NMR. The alcohol-modified GC resins had significantly lower viscosity than that of the control GC resin. The effect of amount of alcohol modifier on resin viscosity was also studied by making a series of resins with different levels of modifier. Both amine-cured and self-crosslinked coatings were prepared from the resins. Coating properties such as hardness, impact strength, methyl ethyl ketone double rubs, flexibility, and adhesion were studied. Differential scanning calorimetry and thermogravimetric analysis were also used to study the thermal properties of the coatings. The resin structures and their coating performance showed an excellent correlation. The coating performance was found to be governed by the type of modifier, structural compositions of the modifier in the resins, type of amine crosslinkers, and techniques of crosslinking used. DOI : 10.1007/s11998-010-9262-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9262-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9909 [article]

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