In this work, a binaphthyl-ether tetramine (BNTA) monomer was designed, synthesized, and reacted with 6FDA to form an in-situ crosslinked polyimide (6FDA-BNTA). Then, novel mixed-matrix membranes (MMMs) were prepared by incorporating the titanium dioxide (TiO₂) nanoparticles into the 6FDA-BNTA polymer matrix to fabricate TiO₂/6FDA-BNTA MMMs for gas separations. The desirable interfacial morphology and uniform dispersion of TiO₂ were obtained due to the nano-confinement effect and stronger hydrogen bond interactions between TiO₂ and 6FDA-BNTA when compared with these of their linear analogues as polymer matrixes. The pristine 6FDA-BNTA membrane and MMMs containing 5–23 wt% of TiO₂ had good mechanical properties, which possessed tensile strengths in the range of 65.2–116.6 MPa and elongation at break of 4.8–7.8%. Gas transport results further revealed that the overall performances of TiO₂/6FDA-BNTA MMMs were maintained with the increasing of the TiO₂ loading content. Specifically, 6FDA-BNTA MMMs with TiO₂ loading of 23 wt% exhibited the highest gas permeability (e.g. PCO₂ = 376.2 Barrer, PO₂ = 76.3 Barrer) and moderate selectivity (e.g. αCO₂/N₂ = 24.3, αO₂/N₂ = 4.9), locating near the Robeson 2008 upper bounds very closely for O₂/N₂, H₂/N₂, and CO₂/CH₄ gas pairs. This facile approach, aiming at improving the incompatibility between two phases via constructing an in-situ crosslinked polymer matrix, provides a new insight for rational design of high-performance MMMs.

在这项工作中，b我Ñ aphthyl醚吨ETR一个矿山（BNTA）单体设计，合成并用6FDA反应以形成原位交联的聚酰亚胺（6FDA-BNTA）。然后，通过将二氧化钛（TiO ₂）纳米粒子掺入6FDA-BNTA聚合物基质中以制备用于气体分离的TiO ₂ / 6FDA-BNTA MMM，从而制备新型混合基质膜（MMM）。由于纳米约束效应和TiO ₂之间更强的氢键相互作用，获得了理想的TiO ₂界面形态和均匀分散性与6FDA-BNTA和它们的线性类似物作为聚合物基质进行比较。原始的5FDA-BNTA 6FDA-BNTA膜和含有5-23 wt％的TiO _2的MMM具有良好的机械性能，其抗张强度范围为65.2-116.6 MPa，断裂伸长率为4.8-7.8％。气体传输结果进一步表明，随着TiO ₂负载量的增加，TiO ₂ / 6FDA-BNTA MMM的整体性能得以保持。具体而言，6FDA-BNTA的MMM有TiO ₂负载23重量％显示出最高的透气性的（例如PCO ₂  = 376.2巴雷，PO ₂  = 76.3巴雷）和中度选择性（例如αCO ₂ / N ₂  = 24.3，αO₂ / N ₂  = 4.9），对于O ₂ / N ₂，H ₂ / N ₂和CO ₂ / CH ₄气对，其位置非常接近Robeson 2008上限。这种简便的方法旨在通过构建原位交联的聚合物基质来改善两相之间的不相容性，为高性能MMM的合理设计提供了新的见解。