Surface modification of polypropylene membrane by argon (Ar) plasma-inducedgraft polymerization with hydrophilic n, onomer [acrylic acid (AA) in this work] was investigated.It was found that both the distance of the membrane from the Ar plasma center and the plasmapower had a strong influence on the surface modification, hydrophilicity and graft yield (GY)of the treated membrane. Results suggest that remote plasma treatment with a proper sampleposition, plasma power and graft polymerization leads to a membrane surface with not only lessdamage, bnt also more permanent hydrophilicity, than direct plasma treatment does. By analyzingthe morphology and the chemical composition of the membrane surface by scanning electronmicroscopy (SEM) and X-ray photoelectron spectroscopy (XPS), as well as Fourier transform infraredattenuated total reflection spectroscopy (FTIR-ATR) respectively, a possible mechanismwas tentatively revealed.
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