Improving hydrophobicity on polyurethane-based synthetic leather through plasma polymerization for easy care effect

Date
2013
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Source Title
Journal of Coatings Technology Research
Print ISSN
1945-9645
Electronic ISSN
1935-3804
Publisher
Springer
Volume
10
Issue
4
Pages
549 - 558
Language
English
Type
Article
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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. © 2013 American Coatings Association & Oil and Colour Chemists' Association.

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Keywords
Easy clean property, HMDSO, Hydrophobicity, Plasma polymerization, PU-based synthetic leather, Easy clean property, Hexamethyl disiloxane, HMDSO
Citation
Published Version (Please cite this version)