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Depth profile of chemical composition and free volume of polyurethane-urea/clay nanocomposite

机译:聚氨酯-脲/粘土纳米复合材料的化学组成和自由体积的深度分布

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Depth profile of subsurface chemical composition and free volume in segmented polyurethane-urea/clay nanocomposites was studied by angle resolved X-ray photoelectron spectroscopy (ARXPS) and Doppler broadening energy spectroscopy (DBES) using slow positron beam. The ARXPS studies revealed increasing N/C atomic ratio (hard segment to soft segment ratio) at any given depth for the clay loaded samples compared to the neat polymer. DBES study revealed significant microstructure modification with clay loading. Self segregation of hard and soft segments in neat polymer and their interspersing with clay loading was observed from DBES measurements.
机译:利用慢正电子束,通过角分辨X射线光电子能谱(ARXPS)和多普勒展宽能谱(DBES)研究了分段聚氨酯-脲/粘土纳米复合材料中地下化学成分的深度分布和自由体积。 ARXPS研究表明,与纯净聚合物相比,粘土加载样品在任何给定深度处的N / C原子比(硬链段与软链段之比)均增加。 DBES研究表明,随着粘土含量的增加,微观结构发生了显着变化。从DBES测量中可以观察到,纯净聚合物中硬链段和软链段的自分离以及它们与粘土负载的散布。

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