AN ALTERNATIVE ANALYSIS OF WATER-VAPOR AND GAS-TRANSPORT IN POLYIMIDEFILMS

The water vapor and gas transport in polyimide films were analyzed usi ng Harmon's model with accounts for case I transport and case ZI trans port. Harmon's model was in good agreement with the experimental data. The diffusion coefficient obtained by Harmon's model was smaller than that obtained by using the short-time slope of mass uptake versus tim e with the exception of CO2 in polyimide. A comparison of the present model and the dual-mode sorption model, in which populations follow He nry's law and Langmuir type, was made.