Argon plasma irradiation of polypropylene

Polypropylene samples were exposed to argon plasma discharge and the changes of the PP surface properties were studied by different methods. Surface wettability was derived from contact angle measured by standard goniometry and chemical structure of the plasma modified PP was studied using X-ray pho...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2010-06, Vol.268 (11), p.2111-2114
Main Authors: Slepička, P., Vasina, A., Kolská, Z., Luxbacher, T., Malinský, P., Macková, A., Švorčík, V.
Format: Article
Language:English
Subjects:
Argon plasma
Contact angle
Plasma (physics)
Plasma treatment
Polypropylene
Polypropylenes
RBS
Roughness
Surface properties
Wettability
X-ray photoelectron spectroscopy
XPS
Zeta potential
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Summary:Polypropylene samples were exposed to argon plasma discharge and the changes of the PP surface properties were studied by different methods. Surface wettability was derived from contact angle measured by standard goniometry and chemical structure of the plasma modified PP was studied using X-ray photoelectron spectroscopy (XPS) and by Rutherford backscattering spectroscopy (RBS), surface morphology and roughness of samples using AFM. Zeta potential of pristine and modified PP was determined with the SurPASS. The presence of incorporated oxygen in the PP surface layer, about 60 nm thick, was observed in RBS spectra. Oxygen concentration is a decreasing function of the depth. With progressing aging time the oxygen concentration on the PP surface decreases. Plasma treatment results in a rapid decrease of the contact angle, which increases again with increasing aging time. In XPS measurement the oxygen containing structures, created by the plasma treatment, were found on the very surface of the modified PP and the zeta potential being changed too. The significant difference in zeta potential between pristine and plasma treated PP clearly indicates that the plasma treatment leads to a more hydrophilic PP surface.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2010.02.012