The dependence of diffusivity of hydrocarbons in polyvyniltrimethylsilane on molecular mobility level

Abstract

It is shown that the diffusivity value of various gases in polyvinyltrimethylsilane is controlled by two factors: molecular mobility level, characterized by fractal dimension of chain part between entanglements, and the size of gas-penetrant molecule. Very strong power dependence of diffusivity on both these factors, explaining very large variation of diffusivity for limited interval of mentioned dimension, is obtained.