Amphiphilically modified self-stratified siloxane-glycidyl carbamate coatings for anti-icing applications / AliReza Rahimi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 1 (01/2021) . - p. 83-97 Titre : Amphiphilically modified self-stratified siloxane-glycidyl carbamate coatings for anti-icing applications Type de document : texte imprimé Auteurs : AliReza Rahimi, Auteur ; Morgan Murphy, Auteur ; Vinod Upadhyay, Auteur ; Kinza Faiyaz, Auteur ; Dante Battocchi, Auteur ; Dean C. Webster, Auteur Année de publication : 2021 Article en page(s) : p. 83-97 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Carbamate de glycidyle Epoxydes Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Polyéthylène glycol Polymères amphiphiles Polyuréthanes Revêtements antigel Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Icephobic coatings have applications in many industries to protect surfaces from deterioration and avoid catastrophic incidents. In this work, we report a new strategy to prepare amphiphilic siloxane-glycidyl carbamate coatings (AmpSiGC) coatings with anti-icing property. Polydimethyl siloxane (PDMS) and poly(ethylene glycol) (PEG) provided amphiphilicity for the AmpSiGC coatings. The designed experiment considered several factors: molecular weight of the surface-modifying polymers and their amount in the coating system. Although amphiphilic coatings have demonstrated promising results as marine coatings, investigations on their icephobic applications have been limited. This work discusses three aspects of the developed AmpSiGC systems: (1) preparation of the incorporated ingredients and their characterization by Fourier transform infrared spectroscopy (FTIR); (2) surface characterization of coatings via ATR (attenuated total reflectance)-FTIR, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM); and (3) ice-adhesion, electrochemical impedance spectroscopy (EIS), and mechanical property evaluations. Overall, the surface analysis indicated the presence of both hydrophobic and hydrophilic domains and most of the coatings demonstrated promising performance for anti-icing applications with desirable barrier and mechanical properties in comparison to controls. Note de contenu : - EXPERIMENTAL : Design of experiments - Materials - Synthesis of glycidyl carbamate resin - Epoxy equivalent weight titrations - Percent solids determination - Fourier transform infrared spectroscopy - Coating formulaton & curing - Icephobic characterization - Statistical analysis - Surface characterization - Water absorption and barrier performance - Mechanical tests - RESULTS AND DISCUSSION : GC resin and prepolymers - Contact angle - Ice adhesion - XPS - ATR-FTIR - AFM images - Water absorption and barrier properties - Mechanical properties - Table 1 : Coating compositions - Table 2 : Epoxy equivalent weight for GC resin and some prepolymers DOI : https://doi.org/10.1007/s11998-020-00402-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00402-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35353 [article]

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Polyurethane pipeline coatings / Stuart G. Croll in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 2 (02/2017)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 2 (02/2017) . - p. 30-42 Titre : Polyurethane pipeline coatings : Do changes in appearance indicate changes in performance ? Type de document : texte imprimé Auteurs : Stuart G. Croll, Auteur ; Chunju Gu, Auteur ; Vinod Upadhyay, Auteur ; Brent D. Keil, Auteur Année de publication : 2017 Article en page(s) : p. 30-42 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composés aromatiques Essais accélérés (technologie) Pipelines -- Revêtements protecteurs Polyuréthanes Revêtements protecteurs -- Détérioration Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Seel water pipelines are intended to be in service for many decades and are protected against corrosion from ground water by cathodic protection and by thick organic polymer coatings. The most common protective coating is a single, thick (> 0.75 mm) layer of an aromatic polyurethane. These coatings are 100-percent solids, two-component spray-applied coatings that cure in less than 30 seconds under normal ambient conditions. Other types of coatings are sometimes used but do not provide the same balance of performance and economy. Occasionally, coated sections of a pipeline may be stored aboveground for an extended period prior to burial and, depending on the local climate, these aromatic polyurethanes rapidly and obviously lose gloss and change color. Inevitably, the substantial changes in appearance cause questions about the corrosion protective abilities of the coating. Upon oxidation, gloss is diminished considerably by the increase in surface roughness that occurs as a coating polymer is randomly eroded. Aromatic polyurethane polymers also become yellow and occasionally a pigment will be bleached by sunlight. After extended oxidation, coatings may chalk with a surface that has become degraded to the extent that it is powdery and almost white. Note de contenu : - EXPERIMENTAL DETAILS - RESULTS AND DISCUSSION : Overall appearance - Gloss - Color - Thickness loss - Electrochemical impedance spectroscopy - FIGURES : 1. Exemplar images of different coatings showing how appearance changed after one month in accelerated weathering. The exposed area is the lower portion of each sample. All figures courtesy of the authors - 2. Loss of gloss measured at 20 degrees in accelerated exposure (top) and in natural exposure (bottom) - 3. Color change after exposure in accelerated weathering - 4. Color change after exposure in natural weathering - 5. Thickness reduction calculated from weight loss of free films in accelerated weathering (top) and in natural exposure (bottom) - 6. EIS results from accelerated weathering of all three samples of each coating. Symbols and colors show impedance data from the same coating formulation. Impedance of the unexposed samples is shown by the open symbols (higher values on each graph). Impedance values after six months are shown by filled symbols - 7. EIS results on panels weathered in Florida and Texas for six months En ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6016 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28372 [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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