在基于 MOF 的混合基质膜中建立气体传输高速公路。
Establishing gas transport highways in MOF-based mixed matrix membranes.
机构信息
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
Shanghai Key Laboratory of High-Resolution Electron Microscopy, ShanghaiTech University, Shanghai 201210, China.
出版信息
Sci Adv. 2023 Mar 31;9(13):eadf5087. doi: 10.1126/sciadv.adf5087.
Achieving percolation pathways in a metal-organic framework (MOF)-based mixed matrix membrane (MMM) without compromising its mechanical properties is challenging. We developed phase separated (PS)-MMMs with an interconnected MOF domain running across the whole membrane. Through demixing two immiscible polyimides, the MOF particles were selectively partitioned into one of the preferred polymer domains at over 50 volume % local packing density, leading to a percolated network at only 19 weight % MOF loading. The CO permeability of this PS-MMM is 6.6 times that of the pure polymer membrane, while the CO/N and CO/CH selectivity remain largely unchanged. Meanwhile, benefiting from its unique co-continuous morphology, the PS-MMM also exhibited markedly improved membrane ductility compared to the conventional MMM at similar MOF loading. PS-MMMs offer a practical solution to simultaneously achieve high membrane permeability and good mechanical properties.
在不损害其机械性能的情况下，在基于金属有机骨架（MOF）的混合基质膜（MMM）中实现渗透途径极具挑战性。我们开发了具有贯穿整个膜的相互连接的 MOF 域的相分离（PS）-MMM。通过使两种不混溶的聚酰亚胺相分离，MOF 颗粒被选择性地分配到其中一个优选聚合物域中，局部堆积密度超过 50 体积%，从而在仅 19 重量% MOF 负载下形成了连续的网络。这种 PS-MMM 的 CO 渗透性是纯聚合物膜的 6.6 倍，而 CO/N 和 CO/CH 的选择性基本保持不变。同时，得益于其独特的共连续形态，与类似 MOF 负载的传统 MMM 相比，PS-MMM 还表现出明显改善的膜延展性。PS-MMM 为同时实现高膜渗透性和良好机械性能提供了一种实用的解决方案。
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