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Adhesion strength and superhydrophobicity of polyurethane/organoclay nanocomposite coatings
Author(s) -
Steele Adam,
Bayer Ilker,
Loth Eric
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.36312
Subject(s) - materials science , contact angle , composite material , adhesion , polyurethane , wetting , coating , silane , nanocomposite , substrate (aquarium) , thermosetting polymer , scanning electron microscope , geology , oceanography
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. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012