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Polyurethane pipeline coatings / Stuart G. Croll in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 2 (02/2017)
[article]
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 électrochimiqueIndex. 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 monthsEn 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
in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 2 (02/2017) . - p. 30-42[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18746 - Périodique Bibliothèque principale Documentaires Disponible 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]
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 électrochimiqueIndex. 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 measurementDOI : 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19826
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 6 (11/2013) . - p. 865-878[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15744 - Périodique Bibliothèque principale Documentaires Disponible Preparation and anticorrosive performances of polysiloxane-modified epoxy coatings based on polyaminopropylmethylsiloxane-containing amine curing agent / Ling Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 4 (07/2011)
[article]
Titre : Preparation and anticorrosive performances of polysiloxane-modified epoxy coatings based on polyaminopropylmethylsiloxane-containing amine curing agent Type de document : texte imprimé Auteurs : Ling Chen, Auteur ; Shuxue Zhou, Auteur ; Shisen Song, Auteur ; Bin Zhang, Auteur ; Guangxin Gu, Auteur Année de publication : 2011 Article en page(s) : p. 481-487 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion
Cardanol
Epoxydes
Revêtements
Revêtements protecteurs
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : In this article, polysiloxane-modified epoxy coatings were prepared using the mixture (CPSA) polyaminopropylmethylsiloxane (PAPMS) oligomer/N-(2-hydroxyethyl)ethylenediamine as a curing agent and cardanol as a compatibilizer. The PAPMS oligomer was prepared from the controlled hydrolysis and condensation of (γ-aminopropyl)methyldimethoxysilane. Conventional epoxy coatings based on commercial phenalkamine epoxy curing agent (PECA) were also fabricated for comparison. The compatibility between the CPSA amine curing agent and epoxy resin was investigated by SEM and element-mapping measurements. The anticorrosive performances of the CPSA- or PECA-based epoxy coatings were thoroughly examined by electrochemical impedance spectroscopy (EIS), salt fog tests, and immersion experiments in acid (25 wt % NaCl). It was found that cardanol can dramatically improve the miscibility of CPSA with epoxy resins. Polysiloxane-modified (namely, CPSA-based) epoxy coatings have much better corrosion resistance than conventional (namely, PECA-based) epoxy coatings. Note de contenu : EXPERIMENTAL : Materials - Preparation of the hardener - Preparation of epoxy protective paints - Characterization
RESULTS AND DISCUSSION : FTIR analyses - The compatibility of CPSA with epoxy resin - Electrochemical impedance results - Anticorrosive performances - WeatherabilityDOI : 10.1007/s11998-010-9311-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9311-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12136
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 4 (07/2011) . - p. 481-487[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013158 - Périodique Bibliothèque principale Documentaires Disponible Preparation and characterization of nanocomposite uralkyd varnishes for a wood substrate / Krysztof Kowalczyk in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 3 (05/2014)
[article]
Titre : Preparation and characterization of nanocomposite uralkyd varnishes for a wood substrate Type de document : texte imprimé Auteurs : Krysztof Kowalczyk, Auteur Année de publication : 2014 Article en page(s) : p. 421-430 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides gras
Bois -- Vernis
Charges (matériaux)
Diisocyanate d'isophorone
Elasticité
Matériaux -- Propriétés barrières
Matériaux hybrides
Montmorillonite
Résine uralkyde
Résistance à l'abrasion
Résistance au chocs
Spectroscopie d'impédance électrochimique
vernis en phase solvantIndex. décimale : 667.9 Revêtements et enduits Résumé : Three types of commercially modified montmorillonites (mMMT) have been tested as nanofillers in solventborne uralkyd coating compositions. The mMMT was introduced in the amount of 0.5 wt part into a coating system based on a soya oil fatty acid and isophorone diisocyanate (100 wt parts), applied onto a wood substrate, and oxidatively cured at room temperature for 14 days. An incorporation of organophilized montmorillonite into a coating composition significantly affects its viscosity (mMMT with a higher gallery space value increases that parameter) and slightly reduces the hardness of a dry coat. Moreover, a clay nanofiller increases glass transition temperature, abrasion resistance, elasticity, and impact resistance as well as barrier properties (measured using a conventional gravimetric method and an electrochemical impedance spectroscopic test) of a cured varnish. In the case of chemical resistance to acetone, lower blistering of modified coats was found. Note de contenu : - Materials
- Varnishes preparations
- Samples preparation
- Test methodsDOI : 10.1007/s11998-013-9558-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9558-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21478
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 3 (05/2014) . - p. 421-430[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16292 - Périodique Bibliothèque principale Documentaires Disponible Preparation and property investigation of epoxy/amine micro/nanocapsule based self-healing coatings / T. E. Sadrabadi in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 5 (11/2018)
[article]
Titre : Preparation and property investigation of epoxy/amine micro/nanocapsule based self-healing coatings Type de document : texte imprimé Auteurs : T. E. Sadrabadi, Auteur ; Saeed Reza Allahkaram, Auteur ; N. Towhidi Année de publication : 2018 Article en page(s) : p. 721-730 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Amines Une amine est un composé organique dérivé de l'ammoniac dont certains hydrogènes ont été remplacés par un groupement carboné. Si l'un des carbones liés à l'atome d'azote fait partie d'un groupement carbonyle, la molécule appartient à la famille des amides. Découvertes en 1849, par Wurtz les amines furent initialement appelées alcaloïdes artificiels.
On parle d'amine primaire, secondaire ou tertiaire selon que l'on a un, deux ou trois hydrogènes substitués.
Par exemple, la triméthylamine est une amine tertiaire, de formule N(CH3)3.
Typiquement, les amines sont obtenues par alkylation d'amines de rang inférieur. En alkylant l'ammoniac, on obtient des amines primaires, qui peuvent être alkylées en amines secondaires puis amines tertiaires. L'alkylation de ces dernières permet d'obtenir des sels d'ammonium quaternaire.
D'autre méthodes existent : 1. Les amines primaires peuvent être obtenues par réduction d'un groupement azoture, 2. Les amines peuvent aussi être obtenues par la réduction d'un amide, à l'aide d'un hydrure, 3. L'amination réductrice permet l'obtention d'amines substituées à partir de composés carbonylés (aldéhydes ou cétones), 4. Les amines primaires peuvent être obtenues par la réaction de Gabriel.
Analyse thermique
Encapsulation
Epoxydes
Essais d'adhésion
Revêtement autoréparant
Spectroscopie d'impédance électrochimique
Stabilité thermiqueIndex. décimale : 668.4 Plastiques, vinyles Résumé : Autonomous self-healing was achieved by synthesizing epoxy coatings which contain dual micro/nanocapsules; epoxy and amine. Epoxy micro/nanocapsules were prepared by an in situ polymerization process and amine microcapsules were fabricated by vacuum infiltration of diethylenetriamine into nanoporous hollow glass microspheres. Both types of capsules were embedded into epoxy matrix. When cracks were created and started to grow in the coating, the micro/nanocapsules near the crack were ruptured and released their contents. As a result of curing reaction between released curing agents (epoxy and amine), healing of the cracked sites was completed. In this work, some properties of epoxy/amine micro/nanocapsule based self-healing coatings such as morphology of micro/nanocapsule and coating, healing and corrosion properties were studied. Also thermal stability and adhesion properties of this kind of coating were evaluated comprehensively. It was found out that optimum mass ratio of epoxy/amine capsules ratio is 1 : 1 and the highest healing efficiency was achieved for a total micro/nanocapsule concentration of 15 wt.%. Regarding thermal and adhesion behavior of coatings, it was observed that adding micro/nanocapsules to epoxy matrix did not change these properties significantly which means self-healing characteristics were achievable without deteriorating other properties. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of micro/nanocapsules - Preparation of coatings - Characterization techniques
- RESULTS AND DISCUSSION : Micro/nanocapsules containing epoxy - Microcapsules containing amine - Reactivity test of core material - Optimization of the ration of epoxy micro/nanocapsules to amine microcapsules in coating - EIS characterization of coatings in different total concentration of micro/nanocapsules - Thermal analysis of coatings - Adhesion testsDOI : 10.3139/217.3527 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3527/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31416
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Code-barres Cote Support Localisation Section Disponibilité 20352 - Périodique Bibliothèque principale Documentaires Disponible Properties and anticorrosion application of acrylic ester/epoxy core–shell emulsions: effects of epoxy value and crosslinking monomer / Ke Zhu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)
PermalinkQuantification of protective properties of the coating/corrosion product/steel interface by integration of transmission line model with EIS results / J. Niu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 2 (03/2015)
PermalinkPermalinkRapid electrochemical assessment of paint / M. Kendig in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 863 (12/1996)
PermalinkScientific coating inspection / J. Sonke in PROTECTIVE COATINGS EUROPE (PCE), Vol. 4, N° 2 (04-05-06/2012)
PermalinkSelection of corrosion test methods based on mechanism principles / Edward C. Ferlauto in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 835 (08/1994)
PermalinkSelf-healing and corrosion performance of polyurethane coating containing polyurethane microcapsules / Hanieh Fathi Fathabadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)
PermalinkService life prediction of organic coatings: electrochemical impedance spectroscopy vs actual service life / Subrahmanya Shreepathi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 2 (03/2011)
PermalinkSivate enhanced amino functional silane / Susan H. Tilford in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4639 (03/2018)
PermalinkSpectroscopie d'impédance électrochimique appliquée à l'étude de la corrosion / C. Gabrielli in MATERIAUX & TECHNIQUES, Vol. 95, Hors série (2007)
PermalinkStudies on characterization of high performance coatings based on polymer alloys of interpenetrating polymer networks / T. Anandaraj in PAINTINDIA, Vol. LI, N° 6 (06/2001)
PermalinkStudy of impedance model and water transport behavior of modified solvent-free epoxy anti-corrosion coating by EIS II / Rui Ding in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 6 (11/2016)
PermalinkStudy of impedance model and water transport behavior of modified solvent-free epoxy anticorrosion coating by EIS / Rui Ding in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
PermalinkA study on the corrosion inhibition properties of silane-modified Fe2O3 nanoparticle on mild steel and its effect on the anticorrosion properties of the polyurethane coating / M. J. Palimi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 2 (03/2015)
PermalinkStudy on the effect of ultrasonication time on transport properties of polyurethane/organoclay nanocomposite coatings / M. Heidarian in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 2 (03/2011)
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