Hydrophobic Properties of Ethylene-Vinyl Alcohol Copolymer Treated with Plasma Source Ion Implantation

Kibeom Kim, Woonmo Sung, Hyunjin Park, Yeonhee Lee, Seunghee Han, Wangjune Kim

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


The industrial use of ethylene-vinyl alcohol copolymer (EVOH) film is limited because it is easily degraded by moisture. The plasma source ion implantation (PSII) technique with CF4 or CH4 gas was used for the EVOH film to improve the surface hydrophobic properties. Variables examined in implantation were ion energy (0-10 keV), treatment time (5 s-5 min), and ion species. The hydrophobic properties of EVOH films were greatly enhanced after a CF4 PSII treatment, as evidenced by an increased contact angle from 66° to above 100° at -5 keV, and remained relatively unchanged during the period of 28 days. X-ray photoelectron spectroscopy, atomic force microscopy, and O2 permeability were used to characterize the surface properties of EVOH films treated with PSII. The improved hydrophobic properties were closely related to the formation of fluorine-containing functional groups such as CF, CF2, and CF3 on the modified surface. The percentage distribution of carbon functional groups supports the role of CF2 and CF3 groups in surface modification.

Original languageEnglish
Pages (from-to)2069-2075
Number of pages7
JournalJournal of Applied Polymer Science
Issue number4
Publication statusPublished - 2004 May 15


  • Ethylene-vinyl alcohol copolymer
  • Film surface modification
  • Hydrophobic
  • Oxygen permeability
  • Plasma source ion implantation

ASJC Scopus subject areas

  • General Chemistry
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry


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