GLOW DISCHARGE POLYMERIZATION IN FLUOROCARBONS/AMMONIA GAS MIXTURE SYSTEMS AND GAS PERMEATION OF THEIR POLYMER FILMS

Abstract

Glow discharge polymerization in mixture systems of fluorocarbons such as tetrafluoromethane, perfluoromethylcyclohexane, and perfluorotoluene; and ammonia gas was investigated by elemental analysis, infrared spectroscopy, and ESCA. Some physical properties for the products were discussed. Glow discharge polymerization in these mixture systems was accelerated by the addition of NH₃ gas. Fluorine atoms were liberated from C-F bonds by the addition of NH₃ gas, and nitrogen residues mainly in amido forms were incorporated into the formed polymers. The surface of the formed polymers changed from hydrophobic to hydrophilic by the addition of NH₃ gas. The gas permeability of the formed films was controlled by the NH₃ concentration, and the relative ratio in the permeability coefficient of oxygen and of nitrogen gas reached to more than 2.