Diels-Alder cycloaddition polymerization for porous poly-phenylenes with exceptional gas uptake properties.

We report the synthesis of two-dimensional and three-dimensional porous polyphenylenes (2D/3D-pPPs) via the Diels-Alder cycloaddition polymerization reaction. The resulting 2D and 3D-pPPs showed surface areas up to 1553 m 2 g -1 , pore volumes of 1.45 cm 3 g -1 and very high H 2 uptake capacities of 7.4 and 7.1 wt% at 77 K, respectively, along with a competitive high-pressure CO 2 and CH 4 uptake performance.