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The electron drift velocity, the longitudinal diffusion coefficient, the effective ionization coefficient and the limiting field strength for mixtures of SF 6 with CHF 3 and CF 4 have been measured with a pulsed Townsend technique. The overall density-reduced electric field strength, E/N, could be varied between 60 and 520 Td (1 Td = 10 −17 V cm 2 ), while the SF 6 content in the gas mixtures was varied over the range 1-50%. We have found that the electron drift velocity and the density-normalized longitudinal diffusion coefficient vary weakly with the amount of SF 6 in the mixture. In contrast, the effective ionization coefficient shows a strong dependence with the SF 6 content, becoming more electronegative as the amount of SF 6 is increased. The measured limiting field strength for these two mixtures is lower than those for SF 6 -N 2 . To our knowledge, no previous ionization or electron transport data for these mixtures have been published.

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A competition among additives for a place in the polymer matrix under levelling effect of the blending enthalpy was found. The competition apparently contradicts the entropy nature of the mixtures exhibiting accelerated desorption of the added compound from films in a glassy-or jelly-like state. The effects considered cannot be treated by statistical of thermodynamics of solutions and the theory of "the chaos elements in the close order range". They are however, explainable by taking into account the specificity of the chainsponge structure function. The processes of the equilibrium sorption of vaporized compounds by polymers are explained by the mechanism of structural entropic solvation and described by the equation of the micropore volume filling theory.

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