Nanoporous Benzoxazole Networks by Silylated Monomers,
Their Exceptional Thermal Stability, and Carbon Dioxide Capture Capacity
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Abstract
The pursuit of synthetic routes for
design and preparation of nanoporous
polymeric networks with inherent permanent microporosity and functionality
through bottom-up methodologies remains a driving force in developing
CO<sub>2</sub>-philic materials. We report nanoporous, processable,
benzoxazole-linked covalent organic polymers (Box-COPs) that show
exceptional thermal stability up to 576 °C. Box-COPs can be formed
into films thanks to the silylation that is used to guide polymeric
network formation. Surface areas of up to 606 m<sup>2</sup> g<sup>–1</sup> and narrow pore sizes of 4.36 Å were observed
with a CO<sub>2</sub> uptake capacity of 139.6 mg g<sup>–1</sup> at 273 K and 1 bar. Box-COPs were stable in boiling water for a
week without deteriorating CO<sub>2</sub> capture capacity