Drag resistance of ship hulls : effects of surface roughness of newly applied fouling control coatings, coating water absorption, and welding seams / Xueting Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 4 (07/2018) . - p. 654-669 Titre : Drag resistance of ship hulls : effects of surface roughness of newly applied fouling control coatings, coating water absorption, and welding seams Type de document : texte imprimé Auteurs : Xueting Wang, Auteur ; Stefan Møller Olsen, Auteur ; Eduardo Andres Martinez, Auteur ; Kenneth Nørager Olsen, Auteur ; Søren Kiil, Auteur Année de publication : 2018 Article en page(s) : p. 654-669 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Humidité -- Absorption:Eau -- Absorption Résistance au glissement Revêtements antisalissures:Peinture antisalissures Soudures Index. décimale : 667.9 Revêtements et enduits Résumé : Fouling control coatings (FCCs) and irregularities (e.g., welding seams) on ship hull surfaces have significant effects on the overall drag performance of ships. In this work, skin frictions of four newly applied FCCs were compared using a pilot-scale rotary setup. Particular attention was given to the effects of coating water absorption on skin friction. Furthermore, to investigate the effects of welding seam height and density (number of welding seams per five meters of ship side) on drag resistance, a new flexible rotor was designed and used for experimentation. It was found, under the conditions selected, that a so-called fouling release (FR) coating caused approximately 5.6% less skin friction (torque) over time than traditional biocide-based antifouling (AF) coatings at a tangential speed of 12 knots. Furthermore, results of immersion experiments and supporting “standard” water absorption experiments showed that water absorption of the FR coating did not result in any significant impacts on skin friction. On the other hand, water absorption was found to actually lower the skin friction of AF coatings. This may be attributed to a smoothening of the coating surface. The effects of welding seam height and density on drag resistance were found to be substantial when welding seam height is above 5 mm, especially at high tangential speeds (above 15 knots). Using an interpolation approach, the pilot-scale welding seam drag data could be used to estimate the drag resistance at approximated full-scale conditions, equivalent to about one welding seam per five meters of ship side. It was shown, in this case, that the contribution of welding seams to ship skin friction could very well be less significant than those of FCCs when the welding seam height is below 5 mm, a representative value for full-scale welding seam height. Note de contenu : - EXPERIMENTAL SETUP : Flexible cylinder - MATERIALS AND EXPERIMENTAL PROCEDURES : Seawater immersion experiments - "Standard" water absorption experiments - Welding seam experiments - RESULTS AND DISCUSSION : Seawater immersion experiments and "standard" water absorption experiments - Welding seam experiments - Comparison of effects of coatings and welding seams on drag resistance DOI : 10.1007/s11998-018-0054-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0054-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30844 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
20078	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Long-term stability of PEG-based antifouling surfaces in seawater / Albert Camós Noguer in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 4 (07/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 4 (07/2016) . - p. 567-575 Titre : Long-term stability of PEG-based antifouling surfaces in seawater Type de document : texte imprimé Auteurs : Albert Camós Noguer, Auteur ; Stefan Møller Olsen, Auteur ; Søren Hvilsted, Auteur ; Søren Kiil, Auteur Année de publication : 2016 Article en page(s) : p. 567-575 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Marines (peinture) 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 -- Détérioration Revêtements antisalissures:Peinture antisalissures Index. décimale : 667.9 Revêtements et enduits Résumé : Poly(ethylene glycol) (PEG) is a hydrophilic polymer that has been extensively used in the biomedical and marine environment due to its antifouling properties. In the biomedical field, PEG has been successfully used to functionalize surfaces due to its resistance to cell and nonspecific protein adsorption. However, the long-term stability of PEG has limited its use in some areas. In the shipping industry, there is a great need for long-term solutions to keep the hulls of the ships fouling-free. The long-term stability of PEG in polydimethylsiloxane (PDMS) fouling-release coatings is studied here, in both accelerated laboratory tests and real seawater conditions. This article shows how PEG-based copolymers, which have been exposed in fouling-release coatings to real-life seawater conditions, are isolated and compared to those exposed to accelerated laboratory testing with successful results. The influence of the chemistry of the PEG compounds, the chosen laboratory degrading agents, and the possible degradation pathways and products are discussed. Note de contenu : - MATERIALS AND METHODS : Materials - PDMS-PEG-PPC copolymers - Separation of nonattached PEG - Laboraroty experiments - Seawater experiments - Liquid chromatography - NMR - FTIR spectroscopy - UV radiation exposure - RESULTS AND DISCUSSION : Laboratory accelerated tests - Analysis of degradation - Seawater experiments DOI : 10.1007/s11998-016-9801-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9801-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26738 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
18223	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 2 / 2)