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

Yang, Guang; Song, Jialu; Hou, Xianghui

Abstract

© 2018 Elsevier B.V. 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/SiO 2 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.

Citation

Yang, G., Song, J., & Hou, X. (2018). Fabrication of highly hydrophobic two-component thermosetting polyurethane surfaces with silica nanoparticles. Applied Surface Science, 439, 772-779. https://doi.org/10.1016/j.apsusc.2018.01.017

• Journal Article Type: Article
• Acceptance Date: Jan 8, 2018
• Online Publication Date: Jan 9, 2018
• Publication Date: May 1, 2018
• Deposit Date: Jan 9, 2018
• Publicly Available Date: Jan 10, 2019
• Journal: Applied Surface Science
• Print ISSN: 0169-4332
• Electronic ISSN: 1873-5584
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 439
• Pages: 772-779
• DOI: https://doi.org/10.1016/j.apsusc.2018.01.017
• Keywords: Thermosetting polyurethane; Hydrophobicity; Sandpaper template; Silica nanoparticles; Hierarchical structure
• Public URL: https://nottingham-repository.worktribe.com/output/903658
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0169433218300199
• Additional Information: This article is maintained by: Elsevier; Article Title: Fabrication of highly hydrophobic two-component thermosetting polyurethane surfaces with silica nanoparticles; Journal Title: Applied Surface Science; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.apsusc.2018.01.017; Content Type: article; Copyright: © 2018 Elsevier B.V. All rights reserved.