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I. Pinnau and co‐workers on page 6696 describe intrinsically ultramicroporous ladder polymers developed for energy‐efficient membrane‐based hydrogen separation. The versatility of an AB synthetic approach in the integration of 3D triptycene moieties into highly rigid, fully fused‐ring ladder polymers yields strongly size‐sieving membrane materials with exceptionally high hydrogen permeability. These...
Increases in hydrogen selectivity of more than 100% compared with the most selective ladder polymer of intrinsic microporosity (PIM) reported to date are achieved with self‐polymerized A‐B‐type ladder monomers comprising rigid and three‐dimensional 9,10‐dialkyl‐substituted triptycene moieties. The selectivities match those of materials commercially employed in hydrogen separation, but the gas permeabilities...
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