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首页> 外文期刊>Journal of coatings technology and research >Nuclear magnetic resonance profiling of chemical warfare agent simulant mass-transport through a multilayered polymeric coating
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Nuclear magnetic resonance profiling of chemical warfare agent simulant mass-transport through a multilayered polymeric coating

机译：化学战剂模拟物通过多层聚合物涂层的质子传输的核磁共振谱

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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.
机译：临时可剥离涂层（TPC）通过吸收液体污染来保护军事装备表面免受化学战剂（CWA）的侵害，从而减少人员接触和蒸气的危害。了解控制吸附的液体CWA传质机制对于优化涂层性能以减少这些危害至关重要。我们应用核磁共振谱分析通过两层聚氨酯TPC解决了CWA双（2-氯乙基）硫化物（芥菜油）模拟物水杨酸甲酯（MS）的传质机理，其中每一层均采用不同的机理吸收液体（通过孔的被动扩散和与液体的溶解）。在污染后增加的时间点获得的深度分布图证明（a）MS体积在整个涂层中扩散的动力学，（b）一层的厚度显着增加及其与总涂层厚度和污染之间的关系，导致聚合物溶胀质量；以及（c）大量内MS定位的优先位。从该示例系统获得的类型信息可以与液体污染物的物理化学特性以及接触危险和蒸气危险测量相关联，以促进下一代涂层的开发。此外，非侵入性地证明了时间分辨的光学不透明多层涂层中多种液体传质机理的确定。

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