| The permeation of simple permanent gases (He, {dollar}rm Hsb2, Osb2, Nsb2{dollar} and CH{dollar}sb4{dollar}), condensible vapors ({dollar}rm COsb2, SOsb2, Csb2Hsb4{dollar} and {dollar}rm Csb3Hsb6{dollar}), and mixed gases ({dollar}rm Osb2/Nsb2{dollar} mixtures and {dollar}rm COsb2/CHsb4{dollar} mixtures) through composite membrane was studied. Dissolution and diffusion of condensible vapors into plasma polymers from fluorocarbon monomers were also studied.; The composite membranes were prepared by the deposition of plasma polymers onto polymer substrates of porous Celgard in a microwave discharge. For the solubility measurements, plasma polymer powders are used. From the permeability and solubility data, diffusivity values were calculated.; In this research, the permeability and the permselectivities of plasma polymer films from fluorocarbon monomers and hydrocarbon monomers were compared. The plasma polymer films from fluorocarbon monomers showed higher permselectivities than plasma polymer films from monomers of hydrocarbons.; In the case of simple permanent gases and plasma films from fluorocarbon monomers, the permeability coefficients decreased as the kinetic molecular diameter of the permeant molecules increased. However, when the kinetic molecular diameters are similar, the condensible vapors showed higher permeabilities than that of permanent gases.; The vapor solubility increased with increasing critical temperature of the vapors. However, in the case of propane, despite its high critical temperature, it showed lower solubility than other vapors.; The vapor diffusivity decreased with increasing kinetic diameter of the molecule. Compared to conventional polymers, the plasma polymers showed much lower values for vapor diffusivities.; The pressure of the permeant did not affect the permeability. The permeability was also not affected by the composition in cases of mixed gases. |
