| Tóm tắt: | The use of ionic liquid [emim][Tf<sub>2</sub>N] as an additive in polyethersulphone (PES) and nano-sized silico-aluminophosphate-34 (SAPO-34) mixed matrix membrane was studied through the incorporation of different amounts of [emim][Tf<sub>2</sub>N] in the membrane composition, as presented in this work, varying from 10 to 40 wt%. Through gas permeation tests using CO<sub>2</sub> and N<sub>2</sub>, the membrane composition containing 20 wt% [emim][Tf<sub>2</sub>N] led to the highest increase in CO<sub>2</sub> permeability and CO<sub>2</sub>/N<sub>2</sub> selectivity. The use of low concentrations of additive (10–20 wt%) promoted a state called antiplasticization; in this state, the permeability was even more regulated by the kinetic diameter of the species which, in this work, permitted achieving a higher CO<sub>2</sub>/N<sub>2</sub> selectivity while increasing the CO<sub>2</sub> permeability until an optimal condition. [emim][Tf<sub>2</sub>N] also promoted a better dispersion of SAPO-34 particles and an increase in the flexibility of the polymeric matrix when compared to a film with the same composition without [emim][Tf<sub>2</sub>N]. Moreover, the characterizations corroborated that the inclusion of [emim][Tf<sub>2</sub>N] increased the zeolite dispersion and improved the polymer/zeolite compatibility and membrane flexibility, characterized by a decrease in glass transition temperature, which helped in the fabrication process while presenting a similar thermal resistance and hydrophilicity as neat PES membrane, without affecting the membrane structure, as indicated by FTIR and a contact angle analysis.
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