Nuclear magnetic resonance profiling of chemical warfare agent simulant mass-transport through a multilayered polymeric coating / Ehsan Gazi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 6 (11/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 6 (11/2012) . - p. 735-743 Titre : Nuclear magnetic resonance profiling of chemical warfare agent simulant mass-transport through a multilayered polymeric coating Type de document : texte imprimé Auteurs : Ehsan Gazi, Auteur ; Steven J. Mitchell, Auteur Année de publication : 2012 Article en page(s) : p. 735-743 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents d'expansion (chimie) Désorption Matériel militaire -- Revêtements protecteurs Polyuréthanes Résistance chimique Résonance magnétique nucléaire Revêtements multicouches Index. décimale : 667.9 Revêtements et enduits Résumé : Temporary peelable coatings (TPCs) protect military equipment surfaces against chemical warfare agents (CWAs) by absorbing liquid contamination, thereby reducing the contact and vapor hazards to personnel. An understanding of the liquid CWA mass-transport mechanisms governing sorption is critical toward optimizing coating properties for reducing these hazards. We applied Nuclear Magnetic Resonance profiling to resolve mass-transport mechanisms of the CWA bis(2-chloroethyl) sulfide (sulfur mustard) simulant, methyl salicylate (MS), through a two-layered polyurethane TPC, where each layer absorbs liquids using different mechanisms (passive diffusion through pores and solubilization with the liquid). Depth profiles obtained at increasing time-points post-contamination demonstrated (a) dynamics of MS volume spread through the coating, (b) polymer swelling by a significant increase in the thickness of one of the layers and its relationship with overall coating thickness and contamination mass, and (c) preferential sites within the bulk for MS localization. Information of the type obtained from this exemplar system can be correlated to the physiochemical properties of the liquid contaminant as well as contact hazard and vapor hazard measurements to facilitate next generation coating development. Moreover, time-resolved determination of multiple liquid mass-transport mechanisms in an optically opaque multilayered coating were demonstrated noninvasively. Note de contenu : - EXPERIMENTAL : TPC contamination - NMR-MOUSE measurements - Data processing - RESULTS AND DISCUSSION : Drop spread volume determination from 1D depth profiles - Depth profiles of uncontaminated TPCs - Depth profiling of coating A after contamination with MS - Depth profiling of multilayered coating B after contamination with MS - The effect of multilayered coating B thickness on MS bulk distribution DOI : 10.1007/s11998-012-9416-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9416-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16659 [article]

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