Preparation of water and/or oil repellent surfaces

It has innovated and deepened in Slippery Liquid-Infused Porous Surfaces study, to obtain a production method at industrial level. In order to achieve this aim, extrusion blends using polyvinylidene fluoride as polymer matrix and poly(methyl methacrylate) and three types of sepiolite (pure sepiolite (SEP), sepiolite modified with metyltrimethoxysilane (SEPM) and sepiolite modified with trifluoropropyl trimethoxysilane and metyltrimethoxysilane (SEPF)) have been performed with the aim of modifying the PVDF crystalline morphology. The blends were prepared by extrusion and they were characterized by conventional techniques (IR, DSC, DMTA, TGA). Films were prepared by hot pressing using two different thermal histories, quenching and annealing. Afterwards, films were exposed to a chemical etching to generate a rough topography on the surface and finally films were infiltrated with perfluorodecalin which ensures the final slippery surface characteristic of SLIPS with low adherence of water and/or oil. Infiltration is successfully obtained since they were differences in slippery angles for water and oil respect to initial samples.