Alkylamine Incorporation in Amidoxime Functionalized Polymers of Intrinsic Microporosity for Gas Capture and Separation

Abstract

Amidoxime functionalized polymers of intrinsic microporosity (PIMs) are synthesized from postsynthetic functionalization of PIM-1 with hydroxylamine and processed into chemisorbents with alkylamine incorporation. Strong interaction between functionalized PIM-1 and primary amines is characterized in detail by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) study. As-prepared sorbents not only show the highest CO 2 uptake capacity (37.9 cm 3 g À1 at 0.15 bar and 298 K) recorded in reported PIMs, but they also demonstrate tunable, processable, and stable polymeric sorbent design, which can be nanoengineered for other gas capture and separation applications.

Non-solvent post-modifications with volatile reagents for remarkably porous ketone functionalized polymers of intrinsic microporosity

“…finding, we allude that the utilization of volatile substances could effectively maintain the specific surface area. Among the reported functionalized PIM-1s to date 2,[8][9][10][11][12][13][14][15][16][17][18][19] , the new PIMs introduced in this work (MI-PIM-1, K-PIM-1, and OH-PIM-1) now rank top three in the comparisons table of porosity, despite the fact that MI-PIM-1 and OH-PIM-1 have passed the modification twice (Supplementary Table 8).…”

“…Considering the CO 2 uptake at a low partial pressure (0.15 bar at 298 K) of any PIM base that have been reported to date, the uptake capacity of PEI-PIM-1 is one of the highest, and most certainly the most robust with the chemically tethered PEI (Supplementary Fig. 30) 8,14,17,18,35,41,49 . Plus, PEI-PIM-1 was comparable to other PEItethered materials as shown in the Supplementary Table 10 50-59 .…”

“…Owing to the deficient chain orientation from a twisted core structure, it inherits a combined benefit of a large surface area porous material and the versatility of a linear polymer 7 . Despite the numerous uses of PIM-1, limitations in its functionality and solvent compatibility have led to attempts to modify its chemistry without sacrificing the surface area and accessible pores 2,[8][9][10][11][12][13][14][15][16][17][18][19] .…”

Amine-functionalized porous organic polymers for carbon dioxide capture

“…13). 104 The DETA impregnation in PIM-1-AO resulted in a high CO 2 uptake (1.75 mmol g À1 at 0.15 bar and 298 K). PIM-1-AO-DETA loaded with CO 2 was regenerated after heating to 80 1C.…”

Single polymer sorbent fibers for high performance and rapid direct air capture

“…The synthesis of amidoxime-functionalized PIM-1 (PIM-1-AO) was performed by modifying our cost-efficient and scalable method that was reported recently. 11 The polymer sorbent is soluble in common solvents. Accordingly, the polymers were spun into fibers (Fig.…”