Gas sorption in polymers based on bisphenol‐A

Equilibrium gas sorption measurements for CO 2 , CH 4 , and N 2 were made with three polymers based on bisphenol‐A, namely a polyhydroxyether, a polyetherimide, and a polyarylate. These data plus previous results for two other bisphenol‐A polymers, polycarhonate and polysulfone, were analyzed using the dual‐mode sorption model and the more recent gas‐polymer‐matrix model. The models were compared on the basis of physical interpretations of the resulting parameters. The Langmuir capacity from the dual‐model model was related to the unrelaxed volume of the glassy polymer. The Henry's law sorption parameter from the dual‐mode model was related to the internal pressure of the polymer and to its tensile stress at yield. The work suggests a means for estimation of gas sorption levels from thermal and mechanical properties of the polymer.