Hydroxyl‐Functionalized Polymers of Intrinsic Microporosity and Dual‐Functionalized Blends for High‐Performance Membrane‐Based Gas Separations

. Such extreme size-sieving capabilities are attributed to physical crosslinking induced by strong hydrogen bonding forming tightly structured polymer networks. The study provides a new general strategy for developing plasticization resistant, robust, and highly-selective PIM-based membrane materials.