Fluoropolymer Coating of Medical Grade Poly(vinyl chloride) by Plasma-Enhanced Chemical Vapor Deposition Techniques

Authors

  • Dawn J. Balazs,

    Corresponding author
    1. Materials Science Institute, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland
    2. Present address: Laboratory for Functional Fibers and Textiles, Swiss Federal Laboratories for Materials Testing and Research (EMPA), Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland.
    • Materials Science Institute, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland. Fax: +41 (71) 274 78 62
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  • Christophe Hollenstein,

    1. Plasma Physics Research Center, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland
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  • Hans Jörg Mathieu

    1. Materials Science Institute, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland
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Abstract

Summary: Medical grade poly(vinyl chloride) was modified by RF plasma-deposition of teflon-like coatings to create a platform for the physisorption of PEO-containing copolymers, Pluronics®. Thin teflon-like coatings were deposited in an RF-plasma reactor by plasma-enhanced chemical vapor deposition (PE-CVD) methods, using hexafluoroethane (C2F6) as a precursor and H2 as a carrier gas. A systematic study of the deposition parameters, C2F6 percentage in the C2F6-H2 gas feed, power input and pressure was completed using X-ray Photoelectron Spectroscopy and water contact angle measurements to characterize the various coatings. The surface analysis results were further correlated to the existing ion-activated growth model. XPS results indicated that the coatings which had the maximum fluorine incorporation, as determined by the F/C ratio, or CFx functional groups, had the highest surface hydrophobicity. The parameters that were determined to yield the maximum contact angle (104°) in the continuous power, RF regime were a high C2F6 percentage (80%) in the C2F6-H2 gas feed and the mid-range power input and pressure values tested (30 W and 0.4 mbar).

original image

Change in C 1s high resolution scans and contact angle achieved following teflon-like deposition on native PVC.

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