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    Crosslinked polydimethylsiloxane exposed to oxygen plasma studied by neutron reflectometry and other surface specific techniques

    Year: 2000

    Journal: Polymer 41 (2000) 6851-6863, 20111221

    Authors: H. Hillborg, J.F. Anknerc, U.W. Gedde, G.D. Smith, H.K. Yasuda, K. Wikström

    Organizations: aDepartment of Polymer Technology, Royal Institute of Technology, SE-100 44 Stockholm, Sweden bABB Corporate Research, Department of High Voltage Engineering, SE-721 78 Västerås, Sweden cReactor Research Facility, University of Missouri-Columbia, Columbia, MO 65211, USA dDepartment of Materials Science and Engineering and Department of Chemical and Fuels Engineering, University of Utah, Salt Lake City, UT 84 112, USA eCenter for Surface Science and Plasma Technology and Department of Chemical Engineering, University of Missouri-Columbia, Columbia, MO 65211, USA

    Spin-coated specimens of crosslinked polydimethylsiloxane (PDMS) exposed to radio-frequency (RF) and microwave (MW) oxygen plasma were studied by specular neutron reflectometry, X-ray photoelectron spectroscopy (XPS), Wilhelmy balance, contact angle measurements, scanning electron microscopy and atomic force microscopy. Neutron reflectometry and XPS showed that the oxygen plasma led to the formation of a smooth (<10 nm), oxidised surface layer with a thickness of 130-160 nm. The oxidised layer contained a mixture of the original polymer and silicon bonded to three or four oxygen atoms (SiOx). The oxidised layer was thinner after longer plasma exposure, indicating a decrease in specific volume due to a conversion of the polymer structure to an inorganic SiOx-rich structure. The formation of the SiOx-containing layer with low segmental mobility was further confirmed by the small hysteresis in the Wilhelmy balance measurements. The similarity in the hydrophobicity recovery kinetics of specimens aged in dry air, dry argon and vacuum and XPS data showed that the hydrophobicity recovery is not due to contamination through adsorption from the atmosphere but due to migration of low molar mass PDMS species to the surface. Scanning electron microscopy also showed the presence of surface cracks in heavily oxidised specimens.