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Authors Seyfi, J. ; Jafari, S.H. ; Khonakdar, H. A. ; Sadeghi, G.M.M. ; Zohuri, G. ; Hejazi, I. ; Simon, F.
Title Fabrication of robust and thermally stable superhydrophobic nanocomposite coatings based on thermoplastic polyurethane and silica nanoparticles
Date 30.08.2015
Number 46462
Abstract In this paper, superhydrophobic nanocomposite coatings based on thermoplastic polyurethane (TPU) and modified nanosilica were fabricated using a simple solution-based method. The main challenge was to impart superhydrophobicity to an intrinsically hydrophilic polymer substrate. The prepared nanocomposite coatings were characterized by means of scanning electron microscopy, confocal microscopy and X-ray photoelectron spectroscopy. Based on the obtained results, it was proved that in order to achieve superhydrophobicity, no TPU macromolecule should be present on the coatings top layer, thus a complete coverage of coatings top layer by nanosilica particles was necessary for achieving ultra water repellent coatings. Mechanical and thermal resistance of the coatings, which are the main challenges in commercializing superhydrophobic surfaces, were also studied by drop impact and thermal annealing tests, respectively. It was proved that using TPU as a sublayer results in improving mechanical resistance of the coatings as compared with the pure silica nanocoating. Moreover, the samples showed an excellent resistance against elevated temperatures (150 °C) and remained superhydrophobic; however, further increment of the annealing temperatures to 200 °C caused the TPU macromolecules to migrate onto the top layer of the coatings significantly reducing the water repellency, which was visually proved by SEM.
Publisher Applied Surface Science
Wikidata
Citation Applied Surface Science 347 (2015) 224-230
DOI https://doi.org/10.1016/j.apsusc.2015.04.112
Tags thermoplastic polyurethane nanosilica superhydrophobic nanocomposite coating mechanical and thermal resistance

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