Porous organic

polymers (POPs) with flexible linkers demonstrated some very unique

properties, although the challenge remains to get high surface area.

Herein, an efficient access to highly porous polysalicylates (named

Mg@BIT-POP-60 and Mg@BIT-POP-61) with benzylic (sp3 C) ester linkage was

developed by a powerful “threein-one” strategy aided by Grignard

reagent. That is, three events of (i) deprotonation of benzylic (sp3)

alcohol, (ii) activation of salicylate chemical switch for efficient

polyesterification by Grignard reagents, and (iii) monolith loading of

Mg2+ in the polymer happened simultaneously by only one simple

operation, which lead to flexible polysalicylates with high BET surface

area up to 549 m2 g?? 1. In addition, an easy processing technology

named premixing-hot pressing (pm-HoP) was developed to make the

nanocomposite membranes with high loadings of Mg@BIT-POP-61 (50 wt%) in

polycaprolactone (PCL). The reversed H2/CO2 selectivity of 3.12 favoring

H2

was observed comparing with pristine PCL (0.3), as well as high H2

permeability of 5805 Barrer. This is a promising strategy to develop

porous fillers-based nanocomposite membranes for overcoming trade-off

effect in gas separation technology.