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Open Chemistry

formerly Central European Journal of Chemistry

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Volume 13, Issue 1


Volume 13 (2015)

Modification of PET surface properties using extremely non-equilibrium oxygen plasma

Ita Junkar
  • Corresponding author
  • Department of Surface Engineering, Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Martina Modic
  • Department of Surface Engineering, Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Miran Mozeti
  • Department of Surface Engineering, Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2014-12-01 | DOI: https://doi.org/10.1515/chem-2015-0061


Polyethylene terephthalate (PET) foils have been exposed to oxygen plasma and its afterglow in order to reveal compositional and structural modifications of the surface layer. Oxygen plasma was created by electrode-less RF discharge in a glass chamber so the O-atom density was close to 1022 m-3 although the density of charged particles was only about 1 × 1016 m-3. Long-living reactive particles created in plasma were leaked into the afterglow chamber using a two-stage rotary pump of pumping speed 4.4 × 10-3 m3 s-1. The density of O-atoms in the afterglow as measured with a catalytic probe was 3 × 1021 m-3, while the density of reactive oxygen molecules was estimated theoretically. The functionalization was accomplished even after a brief exposure to either plasma or afterglow since all samples were saturated with oxygen-rich functional groups as revealed by XPS. The water contact angle measurements, however, showed that only plasma treatment allowed for super-hydrophilicity, explained by rich surface morphology as detected by AFM. The differences in morphological properties between plasma and afterglow treated samples were explained by different interaction mechanisms between low and high energy particles impinging the polymer surface.

Graphical Abstract

Keywords : polymer; plasma; afterglow; surface morphology; functionalization


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About the article

Received: 2014-01-21

Accepted: 2014-05-26

Published Online: 2014-12-01

Citation Information: Open Chemistry, Volume 13, Issue 1, ISSN (Online) 2391-5420, DOI: https://doi.org/10.1515/chem-2015-0061.

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© 2015 Ita Junkar et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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