Porous organic polymers hold great promise for molecular sieving membrane separation. Although the inclusion of functional ionic liquid (IL) in the pores offers a facile way to manipulate their separation properties, the IL leaching during the separation process is difficult to avoid. Herein, we report a strategy to in-situ encapsulate ILs into the micropores of the conjugated microporous polymer membrane via a 6-min electropolymerization and further seal the aperture of the pores to prevent ILs leaching by solvent-assisted micropore tightening (SAMT). Upon screening the binding energy between different ILs and gas molecules, two ILs were selected to be incorporated into the membrane for CO₂/CH₄ and O₂/N₂ gas separations. The resultant separation performances surpass the 2008 Robeson upper bound. Notably, the ILs can be locked in the micropores by a facile high surface tension solvent treatment process to improve their separation stability, as evidenced by a 7-day continuous test. This simple and controllable process not only enables efficient and steady separation performance but also provides an effective strategy for confining and sealing functional guest molecules in the porous solids for various applications.

多孔有机聚合物在分子筛膜分离方面具有广阔的前景。尽管在孔中包含功能性离子液体 (IL) 提供了一种简便的方法来操纵它们的分离特性，但在分离过程中很难避免 IL 浸出。在此，我们报告了一种策略，通过 6 分钟的电聚合将 ILs原位封装到共轭微孔聚合物膜的微孔中，并进一步密封孔的孔径，以防止 ILs 通过溶剂辅助微孔收紧 (SAMT) 浸出。通过筛选不同离子液体与气体分子之间的结合能，选择两种离子液体并入膜中，用于 CO ₂ /CH ₄和 O ₂ /N ₂气体分离。由此产生的分离性能超过了 2008 年 Robeson 的上限。值得注意的是，ILs 可以通过简单的高表面张力溶剂处理过程锁定在微孔中，以提高它们的分离稳定性，7 天的连续测试证明了这一点。这种简单可控的过程不仅可以实现高效稳定的分离性能，而且还为各种应用提供了一种有效的策略来限制和密封多孔固体中的功能性客体分子。