Introduction
Gravimetric vapor sorption provides the means for
simultaneous determination of the isothermal concentration of
water vapor and the chemical diffusion coefficient given a
defined sample geometry such as a polymer film.
The present study determines both properties for two polymer
packaging films, one of which has undergone treatment to
reduce the transmission rate of water. The microscopic (self-)
diffusion coefficient is also calculated from these results to
show the effect of the treatment on water mobility and to
assess how this varies as a function of water content.
