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We present direct measurements of the partial molar enthalpy of carbon dioxide sorption in a family of structurally related bisphenol-A based polymers. Polymers included in this study are: bisphenol-A polycarbonate, tetramethyl polycarbonate, tetrachloro polycarbonate and tetrabromo polycarbonate. All samples were conditioned at 300 psig prior to measurement. Enthalpy changes were determined using...
The thermodynamic changes that accompany mixed gas sorption in glassy polymeric materials are examined. The solid polymer is treated as an elastic solid in the analysis. Two contributions are identified: deformation of the solid to accommodate the penetrant and mixing of the deformed solid and penetrant. Equating the chemical potential of the penetrant in the gas phase to that in the solid yields...
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