PTFE surface modification by Ar plasma and its characterization

0384966 - ÚJF 2013 RIV GB eng J - Článek v odborném periodiku
Kolská, Z. - Reznickova, A. - Hnatowicz, Vladimír - Švorčík, V.
PTFE surface modification by Ar plasma and its characterization.
Vacuum. Roč. 86, č. 6 (2012), s. 643-647. ISSN 0042-207X. E-ISSN 1879-2715
Grant CEP: GA MŠMT(CZ) LC06041; GA AV ČR(CZ) KAN400480701
Institucionální podpora: RVO:61389005
Klíčová slova: polytetrefluoroethylene * plasma * contact angle * zeta potential * AFM * ARXPS
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 1.530, rok: 2012

Polytetrafluoroethylene (PTFE) samples were exposed to argon plasma discharge and the changes of the PTFE surface properties were studied by different methods. Surface wettability and aging of the plasma modified PTFE were derived from the contact angle measured by standard goniometry. Electrokinetical potential (c-potential) was determined by SurPASS Instrument. The zeta-potential and the contact angle characterize "chemistry" of the PTFE surface and also make possible to follow the aging of the PTFE surface after the plasma treatment. The surface morphology and roughness were examined by Atomic Force Microscopy (AFM). Surface concentrations of elements were determined by X-ray photoelectron spectroscopy (ARXPS). The contact angle of the modified PTFE decreases with increasing time of the plasma treatment. During the aging of the plasma modified PTFE the contact angle increases. After the plasma treatment dramatic changes in the PTFE surface morphology and roughness were observed. Also a significant increase of zeta-potential is observed, which indicates more hydrophilic surface of the modified PTFE in comparison with pristine one. With increasing time of the plasma treatment the total oxygen content in the polymer surface layer increases.
Trvalý link: http://hdl.handle.net/11104/0214404