Fabrication of highly hydrophobic two-component thermosetting polyurethane surfaces with silica nanoparticles

Yang, Guang and Song, Jialu and Hou, Xianghui (2018) Fabrication of highly hydrophobic two-component thermosetting polyurethane surfaces with silica nanoparticles. Applied Surface Science . ISSN 0169-4332

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Highly hydrophobic thermosetting polyurethane (TSU) surfaces with micro-nano hierarchical structures were developed by a simple process combined with sandpaper templates and nano-silica embellishment. Sandpapers with grit sizes varying from 240 to 7000 grit were used to obtain micro-scale roughness on an intrinsic hydrophilic TSU surface. The surface wettability was investigated by contact angle measurement. It was found that the largest contact angle of the TSU surface without nanoparticles at 102 ± 3 ° was obtained when the template was 240-grit sandpaper and the molding progress started after 45 min curing of TSU. Silica nanoparticles modified with polydimethylsiloxane were scattered onto the surfaces of both the polymer and the template to construct the desirable nanostructures. The influences of the morphology, surface composition and the silica content on the TSU surface wettability were studied by scanning electron microscopy (SEM), attenuated total reflection (ATR) infrared (IR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and contact angle measurements. The surface of the TSU/SiO2 nanocomposites containing 4 wt% silica nanoparticles exhibited a distinctive dual-scale structure and excellent hydrophobicity with the contact angle above 150°. The mechanism of wettability was also discussed by Wenzel model and Cassie-Baxter model.

Item Type: Article
Keywords: Thermosetting polyurethane; Hydrophobicity; Sandpaper template; Silica nanoparticles; Hierarchical structure
Schools/Departments: University of Nottingham, UK > Faculty of Engineering
Identification Number: 10.1016/j.apsusc.2018.01.017
Depositing User: Eprints, Support
Date Deposited: 09 Jan 2018 13:28
Last Modified: 11 Jan 2018 05:17
URI: http://eprints.nottingham.ac.uk/id/eprint/48999

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