Nitrogen plasma-based ion implantation of poly(tetrafluoroethylene): effect of the main parameters on the surface properties

Kereszturi, Klára and Tóth, András and Mohai, Miklós and Bertóti, Imre and Szépvölgyi, János (2010) Nitrogen plasma-based ion implantation of poly(tetrafluoroethylene): effect of the main parameters on the surface properties. Applied Surface Science, 256. pp. 6385-6389. ISSN 0169-4332

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The surface of poly(tetrafluoroethylene) (PTFE or Teflon) was treated by nitrogen plasma-based ion implantation. Accelerating voltages between 15 and 30 kV, fluences between 1x10to17 and 3x10to17 cm-2 and fluence rates between 3x10to13 and 7x10to13 cm-2 s-1 were applied. The effects of these main parameters were examined on the evolution of surface chemical composition, mean roughness, abrasive wear, wettability and surface electrical resistance. The aim was to obtain relationships, enabling to control the surface properties examined. The F/C atomic ratio determined by XPS strongly decreased, correlating inversely with voltage. The mean surface roughness characterized by topography measurements, increased, correlating directly with fluence and inversely with voltage. The wear volume obtained by multipass scratch tests did not show clear relationship with the main process parameters, however, it increased upon treatment with the increase of surface roughness and O/C atomic ratio. The water contact angle increased at low voltages and high fluences, due to preferential increase of roughness, and decreased at high voltages and low fluences, owing to intense defluorination and incorporation of N and O. The electrical resistance of the PBII-treated surfaces decreased by several orders of magnitude, showing a significant inverse correlation with fluence. It continued to decrease for samples exposed to air, primarily after treatments performed with low fluences, due to post-treatment type oxidation.

Item Type: Article
Uncontrolled Keywords: poly(tetrafluoroethylene), plasma-based ion implantation, XPS, roughness, wear, wettability, electrical resistance
Subjects: Q Science / természettudomány > QC Physics / fizika > QC01 Mechanics / mechanika
Q Science / természettudomány > QC Physics / fizika > QC04 Electricity. Magnetism. Electromagnetism / villamosság, mágnesesség, elektromágnessesség
Q Science / természettudomány > QD Chemistry / kémia > QD01 Analytical chemistry / analitikai kémia
T Technology / alkalmazott, műszaki tudományok > T2 Technology (General) / műszaki tudományok általában
T Technology / alkalmazott, műszaki tudományok > TP Chemical technology / vegyipar, vegyészeti technológia
Depositing User: Dr. András Tóth
Date Deposited: 02 May 2013 14:51
Last Modified: 02 May 2013 14:51

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