Some aspects of plasma copolymerization of acetylene with N2 and/or water

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Abstract
Plasma polymerizations of mixture of acetylene‐N2, acetylene‐H2O, were investigated by using an electrodeless glow discharge from a 13.5‐MHz radiofrequency source. Properties of plasma polymers were examined as functions of mole ratios of N2 and/or H2O to acetylene. The concentration of trapped free radicals and the internal stress in a plasma polymer decreased as the mole ratio of N2 or H2O increased. Water showed the most pronounced effects in those properties at the mole ratio of 0.3. Gas permeabilities increased by the copolymerization of N2 and/or H2O. Surface energies were also investigated by analysis of contact angles of liquids. Copolymerization of N2 caused a remarkable increase in polar contribution of surface energy. Some fundamental aspects of flow‐rate pressure relationship of mixed gases are presented.