Sorption of Gases in Additive Polynorbornene with Norbornyl Substituents

Sorption of carbon dioxide, methane, and hydrogen in additive poly(5-norbornyl-2-norbornene) was studied at pressures in the interval 0–10 bar and temperatures in the interval 10–60°C. The isotherms obtained were described by the double sorption model including both Langmuir and Henry sorption models. The double sorption model parameters and the gas solFigubility coefficients in the polymer at different pressures and at infinite dilutions were determined. The solubility selectivity values were calculated from the data obtained. The highest solubility selectivity for the CO₂/CH₄ gas pair is reached at 20°С. Owing to high values of this selectivity, additive poly(5-norbornyl-2-norbornene) can be considered as a candidate membrane material for the separation of gas mixtures containing CO₂.