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Crosslinking is an effective way to fabricate high-selective CO 2  separation membranes because of its unique crosslinking framework. Thus, it is essentially significant to study the influence of crosslinking degree on the permeation selectivities of CO 2 . Herein, we report a successful and facile synthesis of a series of polyethylene oxide (PEO)-based diblock copolymers (BCP) incorporated with an unique UV-crosslinkable chalcone unit using Reversible Addition-Fragmentation Chain Transfer Polymerization (RAFT) process. The membranes of as-prepared BCPs show superior carbon dioxide (CO 2 ) separation properties as compared to nitrogen (N 2 ) after UV-crosslinking. Importantly, the influence of different proportions of crosslinked chalcone on CO 2  selectivities was systematically investigated, which revealed that CO 2  selectivities increased obviously with the enhancement of chalcone fractions within a certain limit. Further, the CO 2  selectivities of block copolymer with the best block proportion was studied by varying the crosslinking time which confirmed that the high crosslinking degree exhibited a better CO 2 /N 2  (α CO2/N2 ) selectivities. A possible mechanism model revealing that the crosslinking degree played a key role in the gas separation process was also proposed.

Probe Into the Influence of Crosslinking on CO2 Permeation of Membranes