Abstract Substrate morphology has a significant effect on the CO2 transport performance of a thin-film composite (TFC) membrane. In this study, a new mixed solvent comprising 2-pyrrolidone (2-PD) and 2-methoxyethanol (2-ME) was used to prepare polyethersulfone (PES) substrates with bicontinuous structure by water vapor-induced phase separation, followed by immersion in water as nonsolvent. Compared with the commonly used solvent, N-methyl-2-pyrrolidone (NMP), the 2-PD/2-ME mixed solvent is more hydrophilic and can decrease the thermodynamic stability of the casting solution significantly. As a result, the phase separation was induced via the spinodal decomposition mechanism. The open morphology bestowed the optimized substrate with a very high CO2 permeance of 133,226 ± 3870 GPU (1 GPU = 10–6 cm3(STP) s–1 cm–2 cmHg–1 = 3.3464 × 10-9 kg-mol s–1 m–2 Pa–1), which was 5 times more permeable than the baseline substrate synthesized with NMP. By using this new substrate, the prepared TFC membrane containing amines showed an increased CO2 permeance of 908 ± 8 GPU at 57 °C, which was 48 GPU higher than that with the baseline substrate. Meanwhile, the CO2/N2 selectivity was retained at 162 ± 4 at 57 °C. In addition, the good scalability of the new PES substrate was demonstrated by roll-to-roll fabrication of a 50′ long scale-up PES substrate with a width of 21ʺ.

中文翻译：

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具有双连续结构的高渗透性聚醚砜基材用于 CO2/N2 分离中的复合膜

摘要 基材形态对薄膜复合 (TFC) 膜的 CO2 传输性能有显着影响。在这项研究中，一种新的包含 2-吡咯烷酮 (2-PD) 和 2-甲氧基乙醇 (2-ME) 的混合溶剂被用于通过水蒸气诱导相分离制备具有双连续结构的聚醚砜 (PES) 基材，然后浸入水作为非溶剂。与常用溶剂N-甲基-2-吡咯烷酮(NMP)相比，2-PD/2-ME混合溶剂亲水性更强，可显着降低浇铸液的热力学稳定性。结果，通过旋节线分解机制引起相分离。开放形态赋予优化的基材非常高的 CO2 渗透率，为 133,226 ± 3870 GPU（1 GPU = 10–6 cm3(STP) s–1 cm–2 cmHg–1 = 3）。3464 × 10-9 kg-mol s–1 m–2 Pa–1)，其渗透性是用 NMP 合成的基线底物的 5 倍。通过使用这种新基材，制备的含胺 TFC 膜在 57°C 下的 CO2 渗透性增加了 908 ± 8 GPU，比基线基材高 48 GPU。同时，CO2/N2 选择性在 57 °C 时保持在 162 ± 4。此外，通过卷对卷制造宽度为 21' 的 50' 长按比例放大 PES 基板证明了新 PES 基板的良好可扩展性。CO2/N2 选择性在 57 °C 时保持在 162 ± 4。此外，通过卷对卷制造宽度为 21' 的 50' 长按比例放大 PES 基板证明了新 PES 基板的良好可扩展性。CO2/N2 选择性在 57 °C 时保持在 162 ± 4。此外，通过卷对卷制造宽度为 21' 的 50' 长按比例放大 PES 基板证明了新 PES 基板的良好可扩展性。