AVS 46th International Symposium
    Applied Surface Science Division Tuesday Sessions
       Session AS-TuP

Paper AS-TuP13
Surface Energy Change and Hydrophilic Formation of PE, PS and PTFE Films Modification by Hydrogen Ion Assisted Reaction

Tuesday, October 26, 1999, 5:30 pm, Room 4C

Session: Poster Session
Presenter: J. Cho, Yonsei University, Korea
Authors: J. Cho, Yonsei University, Korea
K.H. Yoon, Yonsei University, Korea
S.K. Koh, KIST, Korea
Correspondent: Click to Email
The Polyethylene (PE), Polystyrene (PS) and Polytetrafluoroetyhylene (PTFE) surface modification has been investigated by hydrogen ion assisted reaction with oxygen environment. The IAR is a kind of surface modification technique using ion beam irradiation with reactive gas environment. The hydrogen ion beam energy was 1 keV, ion dose were varied from 5ï‚´1014 to 1ï‚´1017 ions/cm2, and amount of oxygen blowing gas fixed 4 sccm (ml/min). Wettability was measured by water contact angles of water contact angle measurement, and the surface functionality was analyzed by x-ray photoelectron spectroscopy. The contact angle of water to PE modified by argon ion beam only decrease from 95 to 52 degrees, and surface energy was not changed significantly. But, the contact angle using hydrogen ion beam with 4 sccm oxygen environment was stiffly decreased to 8 degree and surface energy 65 ergs/cm. In case of PS, the contact angle and surface energy changes were similar results of PE, but the contact angle of PTFE samples decreased with ion dose up to 1ï‚´1015 ions/cm2, increased at higher dose, and finally increased to the extent that no wetting was possible at 1ï‚´1017 ions/cm2. The PTFE samples irradiated with argon with oxygen environment had lower contact angle than hydrogen with oxygen, even though the samples with oxygen environment developed hydrophilic groups on the irradiated surfaces. This results was due to the hydrogen ion beam that affect the surface cleaning for removing the impurities on PE surface and, then hydrogen ion beam was activated with C-H bonding to make some functional groups in order to react with the oxygen gases, finally, unstable PE surface can be changed from hydrophobic to hydrophilic formation such as C-O and C=O from the XPS analysis, and the ion assisted reaction is very effective tools to attach reactive ion species to form functional groups on C-C bond chains of PE.