Abstract
Permeation rate of gas through thin polymer membranes of high diffusion constant is often determined by not only the diffusion in the membrane but also the adsorption and desorption on the membrane surface. In such cases, if the measurement is made on membranes, one side of which is coated by evaporated metal film of “lake” structure, contribution of these three different processes to the total permeation resistance can be separately estimated.
This paper presents the theoretical basis of the above method and the results of measurement made on cellophane of 50 microns in thickness which shows that the resistances to the three processes are of the same order of magnitude.
