In this study, a series of waterborne polyurethane (WPU) dispersions were prepared by in situ polymerization of edge-isocyanated hexagonal boron nitride (hBN-NCO) nanosheets suspension. The hBN-NCO nanosheets act as both cross linkers and nano-fillers in the composites, and meanwhile, the interfacial compatibility and dispersion of the inorganic nano-fillers in polymer substrates were also greatly improved. Therefore, the WPU films containing only 2 wt% hBN-NCO nanosheets exhibited remarkable mechanical strength and favorable wear resistance, and its stress and Young’s modulus increased by threefold and tenfold, respectively, as compared to those of pure WPU film. Moreover, its low corrosion current density (2.5 × 10⁻⁹ A cm⁻²) and high corrosion potential (0.79 V) enhanced the corrosion resistance of the WPU coating.

在这项研究中，通过边缘异氰酸酯化六方氮化硼（hBN-NCO）纳米片悬浮液的原位聚合制备了一系列水性聚氨酯（WPU）分散体。hBN-NCO纳米片既是复合材料中的交联剂，又是纳米填料，同时，无机纳米填料在聚合物基材中的界面相容性和分散性也得到了极大的改善。因此，仅包含2wt％的hBN-NCO纳米片的WPU膜表现出显着的机械强度和有利的耐磨性，并且其应力和杨氏模量分别比纯WPU膜增加了三倍和十倍。此外，其腐蚀电流密度低（2.5×10 ^-9 A cm ^-2）和高腐蚀电位（0.79 V）增强了WPU涂层的耐腐蚀性。