One-step, self-assembled highly oleophobic nanocomposite coatings. (November 2016) - Zenerino, Arnaud
Abstract: In a previous work, hybrid polymer/NP (nanoparticle) coatings with a homogeneous dispersion of NPs were realized by grafting amine-functionalized silica NPs onto associative thickening perfluorinated copolymers (HASE-F). Due to the presence of acid groups on the HASE_F copolymers, the grafting led to the formation of HASE-F/Si derivatives that will swell in water at neutral pH. Here, we report the post-grafting with perfluorinated acids RFn (C4 F9, C6 F13 and C8 F17 ) in one step on the residual amine functionalities present on the NPs to afford HASE-F/Si/RFn derivatives. It was found that HASE-F/Si/RF8 is well dispersible in water at pH 7, and this suspension can be deposited by spraying and spreading techniques on a glass substrate. The new coatings display high oleophobic properties with olive oil contact angles up to 120°, which is due to a spontaneous self-organization in nanosheets. Highlights: Structuration of nanoparticles grafted copolymers by post reaction. Highly oleophobic nanosheets coatings by spread and spray technics. Oil contact angle of coated surfaces increases from 90° to 120°. Influence of post-grafted molecules on coatings structuration.