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    Adhesion strength and superhydrophobicity of polyurethane/organoclay nanocomposite coatings

    Year: 2012

    Journal: Journal of Applied polymer science, 2012, 125 (S1) pp E445-E452, 20130115

    Authors: Adam Steele, Ilker Bayer, Eric Loth

    Organizations: Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, Center for Biomolecular Nanotechnologies@UNILE, Istituto Italiano di Tecnologia, Arnesano (LE) 73010, Italy

    Substrate adhesion was investigated experimentally for superhydrophobic coatings fabricated from polyurethane modified with waterborne perfluoroalkyl methacrylic copolymer and a (fatty amine/amino-silane surface modified) montmorillonite clay nanofiller. The superhydrophobic coatings were obtained by spray casting precursor solutions onto aluminum surfaces. Upon thermosetting, initial static water contact angles exceeding 160° and contact angle hysteresis values below 8° were measured, yielding antiwetting and self-cleaning characteristics. Adhesion strength was then characterized with a 90° tape testing method and was analyzed with respect to changes in surface morphology via electron microscopy as well as changes in wettability. The coating remained adhered to the substrate after repeated adhesion testing with 3850 N/m tape (one of the strongest available), showing higher adhesion than any superhydrophobic coating reported to the author's knowledge. Superhydrophobic performance was also shown to be retained even after repeated tape testing.