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