Abstract A large-scale exfoliation method to obtain high-quality and mono-layered montmorillonite (Mt) nanosheets via the aggregation of polyethyl-phosphate glycol ester (Exolit OP 550) was proposed. Small-angle X-ray diffraction (XRD), transmission electron microscope (TEM), selected area electron diffraction (SAED), and atomic force microscopy (AFM) examinations indicated that 30.0 wt.% of layered Mt. were exfoliated into mono-layered nanosheets in Exolit OP 550 after a mechanical stirring process at 60 °C for 12 h. This exfoliation concentration was increased by 67–650% compared with that of other works. The Mt. nanosheets with Exolit OP 550 were then assembled into environment-friendly waterborne polyurethane (OPWPU) coating by in situ polymerization. A significant decrease of 60° gloss, from 30.2 GU to 0.3 GU, was observed. Many large, uniform, and continuous spherical particles on the surface of OPWPU nanocoatings were found by scanning electron microscopy (SEM), which resulted in a rough surface that almost completely diffused incident light. Besides, limiting oxygen index (LOI), cone calorimeter testing (CCT), and SEM results suggested that the OPWPU nanocomposites also had improved fire retardancy, especially the peak heat release rate was decreased by a maximum of 39.2%. This study may open up new possibilities for the application of Mt. nanosheets in polymers.

中文翻译：

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蒙脱石高浓度剥离成单层纳米片及其在多功能水性聚氨酯涂料中的应用

摘要 提出了一种通过聚乙基磷酸乙二醇酯（Exolit OP 550）聚合获得高质量单层蒙脱石（Mt）纳米片的大规模剥离方法。小角度 X 射线衍射 (XRD)、透射电子显微镜 (TEM)、选区电子衍射 (SAED) 和原子力显微镜 (AFM) 检查表明，30.0 wt.% 的层状 Mt. 在 60°C 下机械搅拌 12 小时后，在 Exolit OP 550 中将其剥离成单层纳米片。与其他作品相比，这种去角质浓度增加了 67-650%。山 然后通过原位聚合将含有 Exolit OP 550 的纳米片组装成环保型水性聚氨酯 (OPWPU) 涂层。观察到 60° 光泽度显着降低，从 30.2 GU 到 0.3 GU。许多大，通过扫描电子显微镜 (SEM) 在 OPWPU 纳米涂层表面发现了均匀、连续的球形颗粒，这导致表面粗糙，几乎完全漫射入射光。此外，极限氧指数（LOI）、锥形量热仪测试（CCT）和扫描电镜结果表明，OPWPU纳米复合材料还具有提高的阻燃性，尤其是峰值放热率降低了39.2%。这项研究可能为山的应用开辟新的可能性。聚合物中的纳米片。SEM 结果表明 OPWPU 纳米复合材料的阻燃性也有所提高，尤其是峰值放热率降低了 39.2%。这项研究可能为山的应用开辟新的可能性。聚合物中的纳米片。SEM 结果表明 OPWPU 纳米复合材料的阻燃性也有所提高，尤其是峰值放热率降低了 39.2%。这项研究可能为山的应用开辟新的可能性。聚合物中的纳米片。