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Surface oxidation of a Melinex 800 PET polymer material modified by an atmospheric dielectric barrier discharge studied using X-ray photoelectron spectroscopy and contact angle measurement |
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| Authors: | Nai-Yi Cui Deepesh J. Upadhyay Brian J. Meenan |
| Affiliation: | a Department of Physical and Chemical Sciences, College of Science, North China University of Technology, Beijing 100041, China b Randox Laboratories Ltd., 55 Diamond Road, Crumlin BT29 4QY, Northern Ireland, UK c Faculty of Life and Health Sciences, University of Ulster at Coleraine, Coleraine, Co. Londonderry BT52 1SA, Northern Ireland, UK d NIBEC, School of Electrical and Mechanical Engineering, University of Ulster at Jordanstown, Newtownabbey BT37 0QB, Northern Ireland, UK e School of Electrical and Mechanical Engineering, University of Ulster at Coleraine, Coleraine, Co. Londonderry BT52 1SA, Northern Ireland, UK |
| Abstract: | Surface properties of a Melinex 800 PET polymer material modified by an atmospheric-pressure air dielectric barrier discharge (DBD) have been studied using X-ray photoelectron microscopy (XPS) and contact angle measurement. The results show that the material surface treated by the DBD was modified significantly in chemical composition, with the highly oxidised carbon species increasing as the surface processing proceeds. The surface hydrophilicity was dramatically improved after the treatment, with the surface contact angle reduced from 81.8° for the as-supplied sample to lower than 50° after treatment. Post-treatment recovery effect is found after the treated samples were stored in air for a long period of time, with the ultimate contact angles, as measured, being stabilised in the range 58-69° after the storage, varying with the DBD-treatment power density. A great amount of the C-O type bonding formed during the DBD treatment was found to be converted into the C  O type during post-treatment storage. A possible mechanism for this bond conversion has been suggested. |
| Keywords: | PET X-ray photoelectron spectroscopy Dielectric barrier discharge Surface modification |
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