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Silyl-containing polyurethanes that selectively disassemble with fluoride salts / Erick B. Iezzi in COATINGS TECH, Vol. 17, N° 1 (01/2020)
[article]
Titre : Silyl-containing polyurethanes that selectively disassemble with fluoride salts Type de document : texte imprimé Auteurs : Erick B. Iezzi, Auteur ; Eugène Camerino, Auteur ; Grant C. Daniels, Auteur ; James H. Wynne, Auteur Année de publication : 2020 Article en page(s) : p. 26-32 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fluorures
Polymères -- Détérioration
Polymères à silane modifié
Polyuréthanes
Revêtements -- Détérioration
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Crosslinked networks, such as two-component polyurethanes, are used for numerous commercial applications because of their unique mechanical, thermal, and hydrocarbon resistant properties. However, the covalently bonded linkages in these materials are irreversible, which renders them difficult to degrade and destroy unless hazardous chemicals, mechanical abrasion, or thermal treatments are employed. Many of these treatments are labor-intensive, expensive, or present environmental and health concerns. To address these issues, we have developed a novel silyl-based technology that imparts degradable capabilities to crosslinked polyurethane networks, such as coatings. These silyl-containing polyurethanes are thermally stable and highly crosslinked, yet they will disassemble on demand via cascading bond cleavage when exposed to a selective, mild, and environmentally friendly fluoride salt solution. Furthermore, these polyurethanes are resistant to disassembly with strong acid and base solutions, which demonstrates their selectivity and robustness compared to other degradable crosslinked networks. Note de contenu : - Fig. 1 : Removal of the crosslinked polyurethane coating on Navy Aircraft using a methylene chloride-based paint stripper and mechanical sanders
- Fig. 2 : Illustration of a brick house degrading into powder upon contact with rain droplets
- Fig. 3 : Structures of silyl-centered diols, silyl-centered triol, and isocyanate crosslinkers used to form crosslinked polyurethane networks
- Fig. 4 : Illustrations of silyl-containing and non-silyl-containing polyurethane networks, where the silicon atoms of the silyl-containing polyurethanes are highlighted in red and the blue expansion boxes show a close-up of network aliphatic chains and carbamate linkages
- Fig. 5 : Mechanisms of disassembly with fluoride ion for silyl-containing polyurethane 8 and silyl-containing polyurethane 9, and illustration of partially disassembled network 8, where green indicates activated (i.e., cleaved) silyl groups, red indicates non-activated silyl gruops, and aliphatic amine trimers are shown as all black
- Fig. 6 : Time-lapse images of polyurethane 8 immersed in THF and 1.0 MTBAF in THF for five days at room temperature. Polyurethane 8 was unaffected by the THF, yet completely disassembled within five days of exposure in the fluoride salt solution. The networks are outlined in red for visual indciation
- Table 1 : Average Tg of networks after static immersion in solutions at room temperature
- Table 2 : Average Tg of networks after static immersion in solutions of acetone and PM acetateEn ligne : https://drive.google.com/file/d/1_QRMW7CVrk_cwMUcC3GPnL36BC0rOEuQ/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33601
in COATINGS TECH > Vol. 17, N° 1 (01/2020) . - p. 26-32[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21512 - Périodique Bibliothèque principale Documentaires Disponible Single-component polysiloxane topcoat for navy surface ships / Erick B. Iezzi in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 11 (11/2016)
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Titre : Single-component polysiloxane topcoat for navy surface ships Type de document : texte imprimé Auteurs : Erick B. Iezzi, Auteur ; James Tagert, Auteur Année de publication : 2016 Article en page(s) : p. 26-31 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bateaux -- Revêtements:Bateaux -- Peinture
Résistance aux conditions climatiques
Résistance chimique
Réticulation à l'humidité
Revêtement monocomposant:Peinture monocomposant
Revêtements -- Finition:Peinture -- Finition
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).
Souplesse (mécanique)Index. décimale : 667.9 Revêtements et enduits Résumé : This article details a recently developed, novel moisture-curable, haze gray single-component (1K) polysiloxane topcoat for U.S. Navy surface ships. The topcoat is low in VOCs, HAPs-free and provides excellent hydrocarbon resistance, flexibility and weatherability. Note de contenu : - Single-component polysiloxane topcoat
- Experimental procedure
- FIGURES : 1. "Pinking" of an LSA haze gray silicone alkyd on the topside of a Navy surface ship - 2. Sailors roll-apply fresh silicone alkyd - 3. A comparison of flexibility between NRL’s 1K polysiloxane, a qualified silicone alkyd and various 2K polysiloxane topside coatings after being bent over a ¼-inch cylindrical mandrel - 4. Color change after atmospheric exposure of low-solar-absorbing haze gray topcoats - 5. “Pinking” of an LSA haze gray silicone alkyd on the topside of a Navy surface shipEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=5944 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28383
in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 33, N° 11 (11/2016) . - p. 26-31[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18510 - Périodique Bibliothèque principale Documentaires Disponible Water permeation and corrosion resistance of single- and two-component hydrophobic polysiloxane barrier coatings / X. Sun in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)
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Titre : Water permeation and corrosion resistance of single- and two-component hydrophobic polysiloxane barrier coatings Type de document : texte imprimé Auteurs : X. Sun, Auteur ; S. Turnage, Auteur ; Nicholas Dhuyvetter, Auteur ; Erick B. Iezzi, Auteur ; Y. Yang, Auteur ; B. Chang, Auteur ; N. C. Muthegowda, Auteur ; S. K. Balijepalli, Auteur ; L. P. Wang, Auteur ; K. N. Solanki, Auteur ; K. Rykaczewski, Auteur Année de publication : 2017 Article en page(s) : p. 1247-1258 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Essais de résilience
Fourier, Spectroscopie infrarouge à transformée de
Hydrophobie
Matériaux -- Propriétés barrières
Microscopie électronique à balayage
Revêtements protecteurs
Spectroscopie d'impédance électrochimique
Test d'immersionIndex. décimale : 667.9 Revêtements et enduits Résumé : The degradation of corrosion preventative coatings contributes to the high cost and time requirements for maintaining structures in harsh environments. However, the development of new hydrophobic coatings holds the promise of extending the usable life of structures in marine environments. In this work, we quantify the barrier properties and corrosion resistance of two novel highly hydrophobic polysiloxane formulations and the legacy silicone alkyd topcoat used on the topside of Navy’s ships, all with haze gray pigmentation. Based on FTIR-ATR and EIS measurements of the pristine coatings, both the single- (1K) and the two-component (2K) polysiloxane provide significantly improved barrier characteristics (lower water diffusion coefficient and capacitance) than the silicone alkyd. These results were confirmed through a 3-month-long immersion corrosion test, which also showed that the 1K and 2K polysiloxane coatings had comparable degradation characteristic and remained highly hydrophobic. Note de contenu : - EXPERIMENTAL : Materials - Preparation of two-component polysiloxane coating - Preparation of single-component polysiloxane coating - Water diffusion coefficient measurements using FTIR-ATR - Immersion corrosion tests - Characterization of the pristine and corroded coated steel samples
- RESULTS AND DISCUSSION : Characterization of the pristine coatings - Immersion corrosion tests - Scribe testsDOI : 10.1007/s11998-017-9918-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9918-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29625
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1247-1258[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19441 - Périodique Bibliothèque principale Documentaires Disponible