Preparation of Super Super-hydrophobic Polyethersulphone Membrane by Sol Sol-gel Method

摘要

Super Super-hydropho hydrophobic membrane bic has received extensive attention from basic theories and practical applications applications. The properties of the super super-hydrophobicity of membrane are strongly dependent on the prepar prepared ed method, which is attracting increasing concerns worldwide. The he prope properties of super rties super-hydrophobic membrane are dominated by many facto factors including the chemical composition and the morphology of the surface surface. In this work, a simple method to fabricate . super super-hydrophobic membrane with weak hydrophilic polyethersulphone (PES) via a sol-gel process is reported. The weak hydrophilic PES membrane was used as a membrane membrane-based, which was dipped into precursor Sol firstly. After heat treatment, the membrane was dipped into the fluoroalkylsilane solution and then dried by again a heat tre treatment.The super-hydrophobic and porous PES membrane was characterized by Fourier Fourier-Transform Infrared Spectrometers (FTIR), contact angle goniometer, atomic force microscope (AFM). The results showed that the contact angle of super-hydrophobic membrane was up to 154 °treated by precursor sol for 20min and fluorinated for 20h. The hydrophobic functional groups on the membrane surface were he fluorinated groups (-CF3, -CF2, and -CF) and -CH3. The AFM images results showed the membrane surfaces have micro micro-/nanometer crater-like protrusions. Those protrusions contributed for the rough surfaced of membrane, and the root mean square (rms) roughness was about 350.9nm.The hydrophobic groups and the surface roughness structure together lead to the super-hydrophobicity of the porous membrane.