A thermodynamic theory of sorption in glassy polymers

Sorption of vapors by glassy polymers is known to have properties that are different from those typical for sorption rubbery or liquids. Despite an importance many practical applications, this difference still not fully understood. We developed a thermodynamic theory description penetrant activity in the state. The presented approach considers glass transition terms second order phase and utilizes heat capacity changes calculation activity. formalism here explains deviation state equilibrium values. Moreover, sorption-desorption hysteresis can be explained as well. demonstrate only change polymer, but also should considered understand between three cases: liquid, absorption desorption glass. tested on experimental data water maltodextrin bovine submaxillary gland mucin. A very good fitting both cases demonstrated. values increments components obtained used get new insights into non-equilibrium materials.