Mixed matrix composite membranes (MMCMs) integrate the merits of inorganic and organic materials, but the tortuous transport passageways bring about large transfer mass resistance for gas transport. Herein, we prepared polyethylenimine-functionalized halloysite nanotubes (PEI-HNTs) by the electrostatic self-assembly of positively charged polyethylenimine and negatively charged halloysite nanotubes. Blending as-obtained PEI-HNTs with polyvinylamine (PVAm), MMCMs were prepared by casting above mixed solution on the top of ultrafiltration polysulfone (PSf) support. PEI-HNTs had good miscibility with PVAm due to hydrogen bonding. MMCMs (1 wt% PEI-HNTs loading) exhibited exceptional separation performance (CO₂ permeance: 179 GPU; CO₂/N₂ selectivity: 127.9), respectively, which were 1.4 and 2.3 times that of MMCMs embedding with 1 wt% HNTs. Noticeably, its value was beyond those of MMCMs incorporating with reported hollow tubular filler as well as other shape filler. This is due to the fact that PEI on the surfaces of HNTs provides a lot of amine carriers, which facilitate CO₂ transport. More importantly, the transport passageways are continuous, thus presumably reducing the CO₂ transfer resistance compared to other shape inorganic material filled-MMMs. Besides, resultant MMCMs revealed desirable stability for over 360 h, with a CO₂/N₂ mixture as feed gas. Remarkably, it maintained superior gas separation performance (CO₂ permeance of 126 GPU; CO₂/N₂ selectivity of 88.6) under the acidic conditions.

混合基质复合膜（MMCMs）综合了无机和有机材料的优点，但曲折的传输通道给气体传输带来了较大的传质阻力。在此，我们通过带正电的聚乙烯亚胺和带负电的埃洛石纳米管的静电自组装制备了聚乙烯亚胺功能化的埃洛石纳米管(PEI-HNT)。将获得的 PEI-HNT 与聚乙烯胺 (PVAm)混合，通过将上述混合溶液浇铸在超滤聚砜 (PSf) 载体的顶部来制备 MMCM 。由于氢键，PEI-HNT 与 PVAm 具有良好的混溶性。MMCMs（1 wt% PEI-HNTs 负载）表现出卓越的分离性能（CO ₂渗透率：179 GPU；CO ₂ /N₂选择性：127.9)，分别是嵌入 1 wt% HNT 的 MMCM 的 1.4 和 2.3 倍。值得注意的是，它的价值超过了与报道的中空管状填料以及其他形状填料结合的 MMCM。这是由于HNTs表面的PEI提供了大量的胺载体，有利于CO _{2 的}传输。更重要的是，传输通道是连续的，因此与其他填充无机材料的 MMM 相比，可能降低了 CO _{2传输阻力。此外，在使用 CO 2} /N ₂混合物作为原料气的情况下，所得 MMCM 显示出超过 360 小时的理想稳定性。值得注意的是，它保持了卓越的气体分离性能（CO ₂126 GPU的渗透率；酸性条件下CO ₂ /N _{2选择性为88.6)。}