Fabrication of Self-Cleaning Perfluoroacrylate Blend Films by Spray Coating Method

Abstract

The self-cleaning surface was defined as a liquid droplet onto the surface, giving 150o or higher contact angle values and lower than 10o tilt angle values. These surfaces were also called super repulsive surfaces. When the liquid droplet is water, the superhydrophobic surface is obtained. The superhydrophobic surfaces are contained two essential principles. First, low surface energy polymers, such as fluoropolymers pushing the liquid onto the surface, are necessary. The surface roughness is the second necessity to obtain superhydrophobicity, providing air packets between the roughness and reducing surface interaction with the liquid. In this study, the superhydrophobic blend coating was fabricated by a spray coating method using p(Perfluoromethacrylate-ran-Styrene) copolymer and PS homopolymers. The flat surface of PFMA homopolymer synthesized in scCO2 medium was fabricated free meniscus coating method. The hydrophobic silica nanoparticles were used to increase the roughness of the blend solution containing TMS70 with PS polymers. For this purpose, the blend solutions were coated on glass slides by spray coating method having different distances and spray times. The SEM analyses identify the surface morphology. The water contact angle indicated that the superhydrophobic rough surface was obtained with TMS70 and PS blend formation having 33% PS and 12.5% silica nanoparticles.