Modification of hydrophilic property of polypropylene films by a parallel-plate nitrogen-based dielectric barrier discharge jet

Ming Hung Chiang*, Kuo Chi Liao, I. Min Lin, Chi Chang Lu, Hao Yuan Huang, Chi Liang Kuo, Jong-Shinn Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Modification of the hydrophilic properties of polypropylene (PP) films has been investigated using the postdischarge region of a pulsed nitrogen-based dielectric barrier discharge under atmospheric-pressure conditions. Results show that, for the stationary PP films, the contact angle (CA) decreases dramatically from 103° (untreated) to less than 30° (treated) with a wide range of O2/N2 ratios (<1%) and treating distances (<10 mm). In addition, the CA can still be maintained at ∼40° after 24 h of the aging test. For the nonstationary PP films, a highly hydrophilic surface can only be obtained when the PP film is placed near the jet exit with O2/N2 ratios of 0.06%-0.2%. Additionally, the CA can only be maintained at ∼80°-90° when the moving speed is ∼1 cm/s after 24 h of the aging test. These observations are explained through measured optical emission spectra and ozone concentration data, in which the metastable nitrogen plays a key role in breaking the surface chemical bounds and the UV emission (200-300) participates in the process of converting the ozone into oxygen radical. Furthermore, X-ray photoelectron spectroscopy analysis showed that the O/C ratio increases dramatically for improved hydrophilic surface and the incorporation of functional groups containing oxygen (e.g., C-O and C = O) is critical in increasing the aging time after plasma treatment.

Original languageEnglish
Article number5454376
Pages (from-to)1489-1498
Number of pages10
JournalIEEE Transactions on Plasma Science
Volume38
Issue number6 PART 2
DOIs
StatePublished - 1 Jun 2010

Keywords

  • Atmospheric-pressure plasma (APP)
  • Dielectric barrier discharge (DBD)
  • Polypropylene (PP)
  • Quasi-pulsed

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