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|Title:||Investigation of the surface structures and dynamics of polyethylene terephthalate (PET) modified by fluorocarbon plasmas||Authors:||Zhang, L.
|Issue Date:||1999||Citation:||Zhang, L.,Chin, W.S.,Huang, W.,Wang, J.Q. (1999). Investigation of the surface structures and dynamics of polyethylene terephthalate (PET) modified by fluorocarbon plasmas. Surface and Interface Analysis 28 (1) : 16-19. ScholarBank@NUS Repository. https://doi.org/10.1002/(SICI)1096-9918(199908)28:13.0.CO;2-9||Abstract:||Polyethylene terephthalate (PET) surfaces were treated with CH4/CF4 plasmas and the surface structures as well as the dynamic behaviour of the modified surfaces after water immersion were studied using angle-dependent x-ray photoelectron spectroscopy (XPS). It was found that the fluorocarbon plasma treatment resulted in the formation of some fluorine-containing groups, which improve the surface hydrophobicity of the PET films. The extent of surface modification is dependent on the molar ratio of the CH4/CF4 feed gases used in the plasma. The hydrophobicity of the modified PET films decreased after they were immersed in water, partly as a result of the `turnover' or movement of the fluorine-containing groups from the surface to the bulk. From XPS analysis, it was found that the movement of the fluorine-containing groups depends on the modified surface structures. The turnover rates can be described by a decay constant k of surface dynamics; the larger the k value, the faster the movement of the fluorine-containing groups. Experiments showed that the degree of surface modification is higher and is maintained for a longer period for CH4/CF4 mixed plasmas as compared to that treated by pure CF4 plasma. The effect of the molar ratio of CH4/CF4 feed gases and its relationship with the movement of the fluorine-containing surface groups were discussed.||Source Title:||Surface and Interface Analysis||URI:||http://scholarbank.nus.edu.sg/handle/10635/94089||ISSN:||01422421||DOI:||10.1002/(SICI)1096-9918(199908)28:13.0.CO;2-9|
|Appears in Collections:||Staff Publications|
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