Self-assembling metal coatings from phosphated and siloxane-modified polyurethane dispersions: An analysis of the coating-air interface
Polyurethane dispersion coatings containing phosphate and siloxane chains were evaluated for their self-assembling properties for a single-coating system. Dynamic contact angles (DCAs) and X-ray photoelectron spectroscopy (XPS) were used to study the coating-air interface. The siloxane chains were the predominant species on the surfaces of the coatings. The wetting properties of the coating-air interface were reversed when the coated panels were immersed in an ionic solution, and the decrease in hydrophobicity was linear with time. Results from XPS and DCA analyses were similar. The self-assembling properties of the coatings could be useful in the development of hydrophobic coatings from hydrophilic polymers. © 2003 Wiley Periodicals, Inc.