Oleophobic properties

The concentrations of PFAs in environments have increased sharply over time (Holmstrom et al., 2005). The sorption/accumulation and fate of PFAs differ from classical chlorinated and brominated POPs in that perfluorinated molecules have surfactant characteristics (i.e., having polar and nonpolar domains) and oleophobic properties. Thus, PFAs is likely to bind to serum protein rather than lipid in tissues (Jones et al., 2003). 

The perfluoroalkyl diols 12 exhibit good hydrophobic and oleophobic properties. For instance, they are used for treating porous (paper, wood, leather, fibers, textiles) or non porous materials (surfaces of glass, metals or synthetic products). 

Finally, the hydrophobic character of a polymeric material can be estimated from contact angle measurements of a water drop deposited on its surface, the values of the contact angle depending on the chemical composition of the surface. Fluorinated polymers having good hydrophobic and oleophobic properties and... 

Our previous work on the retraction of monolayers from organic liquids and their oleophobic properties led us to propose that when any... 

Hydrophobic as well as oleophobic properties of ORMOCER s were achieved by using various silanes bearing different lengths of fluoralkyl chains which were incorporated by adding them to the mixture of the precursor compounds prior to the hydrolysis. In Table 1 the fluoralkyl-substituted silanes are shown. 

Jabbarzadeh A Effect of nano-patteming on oleophobic properties of a surface, Soji Matter 9 11598-11608, 2013. 

The physicochemistry of silicones gives access to unique features because silicones are soluble neither in water nor in organic oils, so that the silicone part in silicone surfactants contributes hydrophobic as well as oleophobic properties to the molecule. 

The resulting coated product exhibited hydrophobic and oleophobic properties with excellent adhesion to the substrate. Similar results were obtained when polypropylene, polyethylene, polycarbonate, polyamide, polyimide and cellulose derivative films were treated/coated according to Example 1. The same experiment was repeated with paper and fabrics (woven and nonwoven). Similar hydrophobicity and oleophobicity were obtained. Other precursors, such as perfluoropolyethylene glycols and fluorinated alcohols, were tested and-showed the same results. 

The resulting coated product exhibited hydrophobic and oleophobic properties with excellent adhesion to the substrate. 

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