A triptycene derived hypercrosslinked polymer for gas capture and separation applications

Abstract

This work describes facile synthesis of a porous polymeric material (T‐HCP) using readily available reagents. Specifically, T‐HCP is a thermally stable and hypercrosslinked polymer (HCP) that is essentially microporous with a high BET specific surface area (940 m2 g−1). Triptycene based polymers are known to feature internal free volume. Thus, the incorporation of triptycene units and extensive crosslinking by an external cross‐linker in T‐HCP makes it a promising adsorbent for small gas capture applications. Experimental results show that T‐HCP demonstrated good CO2 capture capacity of 132 mg g−1 (273 K, 1 bar). Molecular hydrogen storage capacity of T‐HCP is estimated to be 17.7 mg g−1 (77 K, 1 bar). T‐HCP revealed high CO2/N2 selectivity (up to 63) as well as promising CO2/CH4 (up to 9.1) selectivity suggesting its potential applicability for CO2 separation from flue and natural gases.

Polymerization of Free-Volume-Promoting Monomers for Methane Absorption

“…Interestingly, the desorption curve of powdered I-2,6-tBuAntN displayed a H2-type hysteresis as defined by the IUPAC, which was also observed for I-AntN (Figure S1). This characteristic is reported to indicate a mesoporous character and indicates the presence of bottleneck-type pores within the polymer. , This type of hysteresis has been seen in cross-linked triptycene-based polymers − and similar norbornene insertion polymers …”

Thermally Stable and High-Surface-Area Triptycene and Phenanthroline-Based Microporous Polymer for Selective CO2 Capture over CH4 and N2

“…The functional groups of the resultant polymer (TPPM) were characterized by Fourier-transform infrared (FTIR) spectroscopy using a Nicolet 6700 FTIR instrument (Thermo Fisher Scientific, USA). A Bruker 400 MHz spectrometer tuned to 125.65 MHz (11.74 T) at room temperature was used to acquire the TPPM's 13 C CPMAS NMR data. The polymer sample was packed into zirconium oxide rotors of 4 mm.…”

“…The The elemental composition of TPPM as determined by XPS analysis is also displayed in Table S2, Figure S4, demonstrating that no Al was detected and that the trace of Cl (0.85%) that was observed could be due to some terminal −Cl in the polymer. Figure 1b shows the 13 C CP/MAS NMR spectrum of TPPM. As anticipated, the broad peaks in the range of 140−85 ppm correspond to the aromatic carbons of the polymeric framework.…”

“…The existence of 3D-triptycene in the backbone of polymers or materials with its internal free volume (IFV) confers intrinsic microporosity and its rigid robust structure yields high thermal stability . Utilizing these special features of triptycene, researchers have been able to design triptycene-based materials in recent years for use in sensing, electronics, liquid crystal displays, gas capture and separation, , host–guest chemistry, and molecular machines . In this research work, we have described the synthesis, characterization, and adsorption characteristics of a porous polymer (TPPM) utilizing triptycene and 2,9-dichloro-1,10-phenanthroline as monomers.…”

Amine-functionalized porous organic polymers for carbon dioxide capture

“…108,109 HCPs can be prepared via the Friedel-Crafts reaction from (i) the crosslinking of polystyrene-type precursors in their swollen state, 110,111 (ii) onestep self-polycondensation, 112,113 and (iii) external crosslinking strategies. 109,[114][115][116] Using these methodologies, HCPs can be tailored into efficient porous adsorbents with customized porosity and functionalities for CO 2 capture applications. Recently, the HCPs prepared by the solvent knitting method showed a Brunauer-Emmett-Teller (BET) surface area of 3002 m 2 g À1 .…”