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Anticorrosive barrier coatings modified by core-shell rubber particles : effects on the property transients and premature crack initiation susceptibility of particle type and concentration / Qiong Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 3 (05/2024)
[article]
Titre : Anticorrosive barrier coatings modified by core-shell rubber particles : effects on the property transients and premature crack initiation susceptibility of particle type and concentration Type de document : texte imprimé Auteurs : Qiong Li, Auteur ; Søren Kiil, Auteur Année de publication : 2024 Article en page(s) : p. 1145-1162 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Caoutchouc
Caractérisation
Core-Shell
Epoxydes
Matériaux -- Propriétés barrières
Particules (matières)
Revêtement en phase solvant
Revêtements organiques
Titanate de strontiumIndex. décimale : 667.9 Revêtements et enduits Résumé : Protective epoxy coatings, as a result of their inherent brittleness, show insufficient resistance towards initiation and propagation of cracks, which can occur as early as during the curing process. To improve premature crack initiation resistance, it is essential to understand the underlying mechanisms. In this work, a solvent-based novolac epoxy, cured with a cycloaliphatic amine, was reinforced with either an epoxypropoxypropyl-terminated polydimethylsiloxane (PDMS), nanoparticles of strontium titanate (SrTiO3), or core-shell rubber (CSR) nanoparticles. The effects on coating property transients, curing-induced internal stress, and premature crack initiation susceptibility of the modifier types and CSR (MX 217 and MX 267) concentrations were investigated. In addition, using a digital microscope, the defect and crack morphology in coatings applied to rigid, flat substrates and inner 90-degree angles were characterized. Finally, to evaluate the anticorrosive barrier performance of the reinforced coatings, an electrochemical impedance spectroscopy analysis was employed. Despite a slightly reduced crack initiation susceptibility, the flexible PDMS chains, due to phase separation, resulted in a deteriorated barrier performance. The inclusion of SrTiO3 nanoparticles also led to a reduced anticorrosion performance, relative to a neat epoxy coating, with a slightly lower crack initiation susceptibility and a minor increase (around 0.2 MPa) in the average internal stress. For 5 wt% MX 217 and MX 267 CSR toughened coatings, the maximum internal stress and crack initiation susceptibility in the series, as well as an associated reduced corrosion resistance, were seen. In spite of a reduction in the elastic modulus, an improved barrier performance and a reduced internal stress and crack initiation susceptibility were observed for 25 wt% MX 217 and 37 wt% MX 267 CSR toughened coatings. To improve barrier properties and avoid premature crack initiation of epoxy coatings, guidelines on modifier selection are provided. Note de contenu : - EXPERIMENTAL : Materials and coating preparation - Characterizations
- RESULTS AND DISCUSSION : Effect of modifier type - Effects of CSR concentrations - Effects of modifiers on coating barrier propertiesDOI : https://doi.org/10.1007/s11998-023-00885-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00885-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41083
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 3 (05/2024) . - p. 1145-1162[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24737 - Périodique Bibliothèque principale Documentaires Disponible 24688 - Périodique Bibliothèque principale Documentaires Disponible Preparation and characterization of nanocrystalline and mesoporous strontium titanate thin films at room temperature / M. Mohammadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)
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Titre : Preparation and characterization of nanocrystalline and mesoporous strontium titanate thin films at room temperature Type de document : texte imprimé Auteurs : M. Mohammadi, Auteur ; D. J. Fray, Auteur Année de publication : 2011 Article en page(s) : p. 585-593 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Matériaux nanocristallins
Sol-gel, Procédé
Température de laboratoire
Titanate de strontiumIndex. décimale : 667.9 Revêtements et enduits Résumé : The low temperature perovskite-type strontium titanate (SrTiO3) thin films and powders with nanocrystalline and mesoporous structure were prepared by a straightforward particulate sol–gel route. The prepared sol had a narrow particle size distribution with hydrodynamic diameter of about 17 nm. X-ray diffraction (XRD) revealed that the synthesized powders had a perovskite-SrTiO3 structure with preferable orientation growth along the (1 0 0) direction. TEM images showed that the average crystallite size of the powders annealed in the range 300–800°C was around 8 nm. FE-SEM analysis and AFM images revealed that the deposited thin films had mesoporous and nanocrystalline structure with the average grain size of 25 nm at 600°C. Based on Brunauer–Emmett–Taylor (BET) analysis, the synthesized powders showed mesoporous structure with BET surface area in the range 92–75 m2/g at 400–600°C. One of the smallest crystallite sizes and one of the highest surface areas reported in the literature were obtained, which can be used in many applications, such as photocatalysts. Note de contenu : EXPERIMENTAL : Preparation of the strontium titanate sol - Preparation of strontium titanate thin films - Synthesis of strontium titanate powders.
RESULTS AND DISCUSSION : Particle size - Crystal characterization - Thermal analysis - Microstructure - Specific surface area.DOI : 10.1007/s11998-011-9347-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9347-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12234
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 585-593[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13360 - Périodique Bibliothèque principale Documentaires Disponible