The Study On The Synthesis And Properties Of Fluorinated Copolymers With Carboxyl Group

Because of the fundamental research and practical applications, hydrophobic surfaces, espencially the superhydrophobic surfaces have attracted significant attention recently. And the hydrophobic property is governed by both the geometrical micro-structure and the chemical composition of the surface.Our approach in this work was to design and synthetize different copolymers composed of blocks with different solubility properties. The copolymers were synthetized by Reversible Addition-Fragmentation chain Transfer (RAFT) and free radical polymerization in cyclohexanone with nomomers methylmethacrylater (MMA), methacrylic acid (MAA) and perfluoroalkyl ethyl methylacrylate (FMA), and then tested. The superhydrophobic surfaces were prepared by one-step casting process with different solvents. The surface morphologies and hydrophobicity of as-prepared films were determined by copolymer structures and composition. The carblxyl group could change the solubility of fluorinated copolymers and their surface morphologies, which could help to get superhydrophobic surface by conventional solvent. The hydrophobic property was better when the MMA/MAA proportion was from 5:1 to 1:1. We generated different hydrophobic surfaces by different solvents such as toluene, tetrahydrofuran, benzotrifluoride and 1,1,2-trifluoro-trichloro-ethane (F113). And the contact angle of surfaces generated by toluene was over 150°, and its slide angle was less than 10°, which was significant for the perparation of the cost-effective, low-pollution superhydrophobic surfaces.Moreover, the water-proof property and thermal stability of these surfaces were conducted upon immersion in deionized water and exposure to temperatures up to 150℃. The water-proof property was effected by the substrate and the thermal stability of the superhydrophobicity was improved by polymethyacrylic acid (PMAA).