Improving hydrophobicity on polyurethane-based synthetic leather through plasma polymerization for easy care effect |
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Authors: | Burcak Karaguzel Kayaoglu Emre Ozturk F Seniha Guner Tamer Uyar |
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Affiliation: | 1. Textile Technologies and Design Faculty, Istanbul Technical University, Gumussuyu Campus, Inonu Cad. No: 65, Gumussuyu, Beyoglu, 34437, Istanbul, Turkey 2. Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, Istanbul, Turkey 3. UNAM-Institute of Materials Science & Nanotechnology, Bilkent University, Ankara, Turkey
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Abstract: | This study reports on the deposition of a hydrophobic coating on polyurethane (PU)-based synthetic leather through a plasma polymerization method and investigates the hydrophobic behavior of the plasma-coated substrate. The silicon compound of hexamethyldisiloxane (HMDSO), inactive gas argon (Ar), and toluene were used to impart surface hydrophobicity to a PU-based substrate. Surface hydrophobicity was analyzed by water contact angle measurements. Surface hydrophobicity was increased by deposition of compositions of 100% HMDSO, 3:1 HMDSO/toluene, and 1:1 HMDSO/toluene. Optimum conditions of 40 W, 30 s plasma treatment resulted in essentially the same initial contact angle results of approximately 100° for all three treatment compositions. The initial water contact angle for untreated material was about 73°. A water droplet took 1800 s to spread out on the plasma-treated sample after it had been placed on the sample surface. An increase in plasma power also led to a decrease in contact angle, which may be attributed to oxidization of HMDSO during plasma deposition. XPS analysis showed that plasma polymerization of HMDSO/toluene compositions led to a significant increase in atomic percentage of Si compound responsible for the hydrophobic surface. The easy clean results for the treated and untreated PU-based synthetic leather samples clearly showed that the remaining stain on the plasma-polymerized sample was less than that of untreated sample. The plasma-formed coating was both hydrophobic and formed a physical barrier against water and stain. |
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