Synthesis, characterization, and CO₂ uptake of mellitic triimide‐based covalent organic frameworks

Abstract

This work expands the library of high‐performance polyimide covalent organic frameworks (COFs) through the imidization polymerization of mellitic trianhydride with two different triamines. The resulting porous polymers possess microporous structures (< 2 nm pore sizes), exhibit relatively large surface areas (> 300 m2 g−1), and are thermally stable up to 275 °C. Moreover, both COFs show good CO2 uptake with capacities around 40 cm3 g−1.

Synthesis and Structure–Property Relationships of Polyimide Covalent Organic Frameworks for Carbon Dioxide Capture and (Aqueous) Sodium-Ion Batteries

“…Lower charge-transfer resistance was reported via impedance spectroscopy measurements along with superior rate-capability performance (3 times more capacity at 10 C). 48 …”

“…In addition, polyimides can facilitate redox reactions, 13 making these promising electrode materials in batteries. Recently, imide-based COFs were reported, 45 , 47 , 48 introducing a new material family with high porosity, stability, and high availability from biomass. These properties may provide opportunities that answer the typical drawbacks of state-of-the-art organic electrodes and thus potentially may lead to the development of new redox-active polymers for cheap transition metal-free next-generation batteries.…”

“… 60 , 61 However, in order to utilize nanoporous adsorbents in industry applications, a thermally and chemically stable polymer backbone is often required. As such, polyimide-based COFs are expected to be promising candidates, 45 , 47 , 48 and systematically studying their gas sorption properties pushes the field forward.…”

“…The development of new linkages to synthesize such covalent frameworks is essential to exploit the technological potential of this emerging class of materials. Polyimides are known for their high thermal stability − and excellent chemical resistance and are widely used as thermoplastics as well as in the electronic industry. In addition, polyimides can facilitate redox reactions, making these promising electrode materials in batteries.…”

Geomimetic Hydrothermal Synthesis of Polyimide‐Based Covalent Organic Frameworks

“…Although PI exhibits excellent thermal stability, mechanical performance, chemical resistance, and redox‐active properties, [31] there are few studies on PI‐based COFs because the formation of imide bonds is favored over the deformation, thus limiting their capability to achieve long‐range‐ordered crystalline PI networks. As such, most previous studies have employed solvothermal methods using a combination of toxic organic solvents and catalysts in a closed vessel with a low internal pressure to facilitate the nucleation and crystallization of the PI‐based COFs; under these conditions, the reversibility of COF formation is maintained and the equilibrium reaction yielding water as a byproduct is controlled (Supporting Information, Table S1) [23, 32–37] . Recently, Lotsch and co‐workers reported a new synthetic method (i.e., ionothermal synthesis) for PI‐COFs using ZnCl 2 as reaction media free of toxic solvents [38] .…”