Characterization and Properties of the Plasma Polymer Films prepared from Carbon Dioxide and 1,3-Butadiene

Abstract

We prepared plasma-polymerized thin films from a mixed gas of carbon dioxide and 1,3-butadiene. Their XPS and FT-IR spectra revealed that hydrophilic groups such as hydroxyl, carboxyl and carbonyl groups existed in the thin films. The content of the C-H carbons gradually decreased with increase in the plasma output power or the CO₂/butadiene flow rate ratio, while the amounts of carbonyl and carboxyl carbons increased correspondingly. In addition, coating of the plasma-polymerized CO₂/butadiene thin film on a polytetrafluoroethylene substrate was found to enhance the adhesion strength when the surface-modified substrate was bonded to a steel plate with an α-cyanoacrylate adhesive. These superior adhesion properties of the plasma-polymerized thin films formed on the substrates indicate that the oxygen-containing functional groups formed at the film surface play a major role in increasing the adhesion strength.