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首页> 外文期刊>Magnetochemistry >Spatially Resolved Measurements of Crosslinking in UV-Curable Coatings Using Single-Sided NMR
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Spatially Resolved Measurements of Crosslinking in UV-Curable Coatings Using Single-Sided NMR

机译：使用单面NMR的可紫外固化涂层中交联的空间分辨测量

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The UV-driven photocuring of coatings results in a crosslinked polymeric network. The degree of crosslinking in these coatings is typically assessed via optical spectroscopy; unfortunately, optical methods are typically limited in their maximum depth access. Alternatively, single-sided nuclear magnetic resonance (NMR) can be used to probe the crosslinking of UV-curable coatings in a spatially sensitive manner. Relaxation measurements, which correlate with crosslinking, can be done with a spatial resolution on the order of microns throughout the depth dimension of the coating, regardless of optical transparency of the material. These results can be visualized via a relaxation cross-section that shows the depth at which a particular relaxation value is observed. These measurements are used to probe the effect of a scavenger molecule that is added to the coating mixture, allowing for efficient crosslinking despite the presence of atmospheric oxygen. This method may find purchase in evaluating systems whose crosslinking properties are intentionally varied throughout its thickness; using NMR, these systems, up to approximately one hundred microns thick, can be measured without repositioning or rastering.
机译：紫外线驱动的涂料光固化导致交联的聚合物网络。这些涂层中的交联度通常通过光谱学来评估。不幸的是，光学方法的最大深度访问通常受到限制。可替代地，单侧核磁共振（NMR）可以用于以空间敏感的方式探测可UV固化涂层的交联。与交联有关的弛豫测量可以在整个涂层的深度尺寸上以微米级的空间分辨率进行，而与材料的光学透明度无关。这些结果可以通过松弛横截面可视化，该横截面显示观察到特定松弛值的深度。这些测量用于探查添加到涂料混合物中的清除剂分子的作用，即使存在大气中的氧气也可以进行有效的交联。该方法可在评估系统中找到，该系统的交联特性在整个厚度范围内有意改变。使用NMR，这些系统的厚度可达大约100微米，无需重新定位或栅格化即可测量。

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