Flow synthesis of hypercrosslinked polymers with additional microporosity that enhance CO2/N2 separations

Nadhita Chanchaona, Liang Ding, Shiliang Lin, Sulaiman Sarwar, Simone Dimartino, Ashleigh Fletcher, Daniel M. Dawson, Kristina Konstas, Matthew R. Hill, Cher Hon Lau

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Hypercrosslinked polymers (HCPs) are typically synthesised over 24 hour batch reactions, limiting productivity rates during scale-up production. Continuous flow synthesis can potentially overcome this limitation. However, the formation of insoluble HCP products, compounded by HCP expansion due to solvent adsorption during synthesis can clog flow reactors. Here, we overcome clogging issues through reactor design and optimisation of synthesis parameters. Using this reactor, we synthesised HCPs via internal, post-, and external crosslinking strategies underpinned by Friedel-Crafts alkylation over various synthesis parameters - residence time, substrate concentration, reagent ratio, and temperature. The space-time-yield (STY) values, a key parameter for productivity rates, of flow synthesis were 32-117 fold higher than those in batch reactions. HCPs produced via internal crosslinking in flow synthesis contained additional microporosity that enhanced CO 2/N 2 selectivity at 298 K by 850% when compared to HCPs produced in batch reactions. Outcomes from this work could enable high productivity scale-up production of HCPs for post-carbon capture.

Original languageEnglish
Pages (from-to)9859-9867
JournalJournal of Materials Chemistry A: materials for energy and sustainability
Issue number18
Early online date27 Jan 2023
Publication statusPublished - 14 May 2023


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