In situ preparation and properties of waterborne polyurethane/edge-isocyanated hexagonal boron nitride composite dispers
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In situ preparation and properties of waterborne polyurethane/ edge-isocyanated hexagonal boron nitride composite dispersions Huixiang Liu, Weiju Hao, Yixiu Qin
Ó American Coatings Association 2020 Abstract 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 hBNNCO nanosheets act as both cross linkers and nanofillers in the composites, and meanwhile, the interfacial compatibility and dispersion of the inorganic nanofillers 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 9 10 9 A cm 2) and high corrosion potential (0.79 V) enhanced the corrosion resistance of the WPU coating. Keywords Waterborne polyurethane, Hexagonal boron nitride, In situ polymerization, Interfacial compatibility, Anti-corrosion
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11998-020-00385-6) contains supplementary material, which is available to authorized users. H. Liu Department of Material Science, Fudan University, Shanghai 200433, People’s Republic of China W. Hao College of Science, University of Shanghai for Science and Technology, Shanghai 200093, People’s Republic of China Y. Qin (&) Department of Macromolecular Science, Fudan University, Shanghai 200433, People’s Republic of China e-mail: [email protected]
Introduction Waterborne polyurethane (WPU) is an environmentally friendly material that has been widely used in adhesives and coating.1–4 However, the large-scale application of pure WPU is limited by its low mechanical strength, poor wear and corrosion resistance.5–7 To promote the performance of WPU, various strategies including proper molecular design, physical blending and compounding with inorganic materials have been developed.8,9 Owing to the specific functional groups, shapes and specific surface areas of inorganic nano-fillers,10–12 nano-filler strategy can improve both the physical and chemical properties of polymer materials, and endow them with new function such as antibacterial property, magnetic and flame resistance.13–15 Recently, hBN has shown excellent potential in the fabrication of functional polymer nano-fillers, which can increase the thermal conductivity, hardness, lubricity and other properties of the polymer matrix.16–19 Ryu et al.20 prepared the polyurethane/hBN composites by a melt mixing method, and the composites show improved mechanical strength and thermal conductivity. Zhang et al.21 developed super-paramagnetic zinc ferrite boron nitride nano-fillers (ZF-BNNS) in epoxy resin matrix, and ordered orientation of ZF-BNNS nanofillers in epoxy resin matrix was realized under weak magnetic field (0.05 T). This s
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