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Surface Energy and Wettability of Plasma-treated Polyacrylonitrile Fibers
Authors:Yan Chun Liu  Da Nian Lu
Institution:(1) College of Chemistry & Chemical Engineering, Donghua University, Yan’an West Road 1882, Shanghai, 200051, The People’s Republic of China
Abstract:Polyacrylonitrile fibers were treated with a nitrogen glow-discharge plasma. The surfaces of untreated and treated fibers were examined with contact angle measurements, atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). Surface energy calculations of the fibers were carried out from contact angle measurements using the relationships developed by Fowkes. It is found that plasma treatment causes a reduction in water contact angle on the fiber surfaces. The dispersion component of surface energy changes slightly, while the polar component is increased significantly from 14.6 mN/m to 58.7 mN/m and the total surface energy increase is 139%. The increase of surface energy is mainly caused by the introduction of hydrophilic groups on the fiber surfaces after plasma treatment.
Keywords:Polyacrylonitrile  Plasma  Surface energy  Contact angle  polar groups
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