Conventional technology for the purification of organic solvents requires massive energy consumption, and to reduce such expending calls for efficient filtration membranes capable of high retention of large molecular solutes and high permeance for solvents. Herein, we report a surface-initiated polymerization strategy through C–C coupling reactions for preparing conjugated microporous polymer (CMP) membranes. The backbone of the membranes consists of all-rigid conjugated systems and shows high resistance to organic solvents. We show that 42-nm-thick CMP membranes supported on polyacrylonitrile substrates provide excellent retention of solutes and broad-spectrum nanofiltration in both non-polar hexane and polar methanol, the permeance for which reaches 32 and 22 l m⁻² h⁻¹ bar⁻¹, respectively. Both experiments and simulations suggest that the performance of CMP membranes originates from substantially open and interconnected voids formed in the highly rigid networks.

用于纯化有机溶剂的常规技术需要大量的能量消耗，并且为了减少这种消耗，需要能够高保留大分子溶质并且对溶剂具有高渗透性的有效过滤膜。在本文中，我们报告了通过C–C偶联反应制备共轭微孔聚合物（CMP）膜的表面引发的聚合策略。膜的骨架由全刚性共轭体系组成，对有机溶剂显示出很高的抵抗力。我们表明，载于聚丙烯腈基底上的42 nm厚CMP膜在非极性己烷和极性甲醇中均具有出色的溶质保留和广谱纳米过滤性能，其渗透率分别达到32和22 l m ^-2  h ^-1  bar^-1。实验和模拟均表明，CMP膜的性能源自在高刚性网络中形成的基本开放和相互连接的空隙。