Highly oleophobic properties of PEDOP polymers with short perfluorobutyl chains separated by long alkyl spacers and amido connectors

Description

In order to find alternatives to long perfluorinated chains, due to their bioaccumulative potentials, in the elaboration of superoleophobic surfaces, an original 3,4-ethylenedioxypyrrole (EDOP) derivative containing a perfluorobutyl chain (F-butyl) is synthesized and characterized. The F-butyl chain is separated from the by a long undecyl spacer and an amido connector in order to reduce itsmobility (confirmed by cyclic voltammetry). The electrodeposition of the corresponding polymer leads to superhydrophobic and highly oleophobic properties with contact angles of 158.5 , 137.0 , and 129.1 for water, diiodomethane, and hexadecane, respectively. Smooth surfaces are elaborated to compare these values. Here, the presence of amido groups seems to specifically increase the oil-repellent properties in comparison with the water-repellent properties, due to the polarity of this group. The influence of some electrolytes on the surface morphology and wettability is also reported.

Abstract

International audience

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