Improving CO2 separation performances of Styrene-Butadiene-Styrene Triblock Copolymer Membranes by tunning its Microstructure via varying solvents and/or non-solvents

Carbon Capture Science & Technology Pub Date : 2024-11-17 DOI:10.1016/j.ccst.2024.100341

Jing Wei , Ce Yang , Wentao Du , Min Deng , Zikang Qin , Yulei Ma , Zheng Yan , Lin Yang , Lu Yao , Wenju Jiang , Zhongde Dai

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Abstract

Microstructure in block copolymers has a critical impact on CO₂ separation performances. In this work, styrene-butadiene-styrene (SBS) triblock copolymer membranes were made using various solvent/non-solvent combinations. It was found that the solvents changed their microstructure thus the CO₂ separation performances were changed accordingly. CO₂ permeability in the range of 203.4 to 282, and CO₂/N₂ selectivity in the range of 15.8 to 22.7. The highest CO₂ separation performance (P_CO2 282 Barrer with CO₂/N₂ selectivity of 20.5) was obtained using cyclohexane (CYH) as solvent. Furthermore, the CO₂ separation performances of the membrane can be further improved by DI water-induced microstructure rearrangement (P_CO2 343.5 Barrer and CO₂/N₂ selectivity 17.9). In addition, it was found that the rearranged membrane demonstrated stable gas separation performance after the membrane was stored under ambient conditions for about 120 days, clearly denoting that the CO₂ separation performances of block copolymeric membranes can be tuned by varying the solvents/non-solvents.

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Carbon Capture Science & Technology

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