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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通过不同溶剂和/或非溶剂调整结构，改善苯乙烯-丁二烯-苯乙烯三嵌段共聚物膜的CO2分离性能

嵌段共聚物的微观结构对其CO2分离性能有重要影响。在这项工作中，苯乙烯-丁二烯-苯乙烯（SBS）三嵌段共聚物膜采用不同的溶剂/非溶剂组合。发现溶剂改变了其微观结构，从而改变了CO2的分离性能。CO2渗透率为203.4 ~ 282，CO2/N2选择性为15.8 ~ 22.7。以环己烷（CYH）为溶剂，PCO2 282 Barrer的CO2/N2选择性为20.5，具有最高的CO2分离性能。此外，DI水诱导的微观结构重排可以进一步提高膜的CO2分离性能（PCO2阻隔系数为343.5，CO2/N2选择性为17.9）。此外，在环境条件下储存约120天后，发现重新排列的膜具有稳定的气体分离性能，这清楚地表明，通过改变溶剂/非溶剂可以调节嵌段共聚物膜的CO2分离性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Carbon Capture Science & Technology

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