Thirty-minute preparation of microporous polyimides with large surface areas for ammonia adsorption

Abstract

Toxic solvents and catalysts, tedious monomer synthesis, as well as long reaction time significantly limit the sustainable and large-scale preparation and practical application of microporous polyimides (MPIs). In this work,...

Versatile One-Pot Construction Strategy for the Preparation of Porous Organic Polymers via Domino Polymerization

“…Evidently, the cross-linking reaction among MA monomers is decisive for the formation of PPIs but not the imidization reaction. Our previous work demonstrates that the imidization reaction can be completed within 30 min . As elucidated in ref , , with the elongation of polymerization time, the radical concentration increases slowly at the initial polymerization stage, and then the rate of radical formation greatly accelerates.…”

“…Our previous work demonstrates that the imidization reaction can be completed within 30 min. 24 As elucidated in ref 46, 47, with the elongation of polymerization time, the radical concentration increases slowly at the initial polymerization stage, and then the rate of radical formation greatly accelerates. Since the polymerization reaction is carried out without stirring, cross-linking is controlled by sporadically generated radicals in the initial polymerization stage, though local MA and TAPB monomers can be connected by imidization condensation.…”

“…DPS has been proved to be a green, recyclable, and lowtoxicity (LD 50 >2000 mg/kg) solvent for the preparation of PPIs in our previous studies. 23,24 Here, the recycling ability of DPS for the domino reaction was verified as described in Figure 5. It is found that the BET surface area of M-POP-B-280-6 is slightly reduced from 730 to 665 m 2 /g after three cycles and the recovery rate of DPS in each cycle is more than 95%.…”

“…In our previous work, two categories of POPs with imide knots have been prepared via thermal polymerization of commercially available bismaleimide monomers and polycondensation between aromatic triamines and dianhydrides, respectively. , The detailed investigation of the polymerization mechanism reveals that the evolution of polyimide networks is realized via the sequential imidization and cross-linking reactions. In this study, starting from maleic anhydride (MA) and 4,4′-diaminodiphenylmethane (MDA), a porous polyimide polymer (M-POP-MDA) was first prepared, having the same chemical structures and equivalent surface area as poly­( N , N ′-4,4′-diphenylmethane-bismaleimide) as reported in ref .…”

Hydrothermal polymerization of porous aromatic polyimide networks and machine learning-assisted computational morphology evolution interpretation

“…Polyheterocyclic networks are interesting, because they combine porosity with high thermal and chemical stabilities (imparted through being built up of exclusively strong bonds) with functionality (imparted through the heteroatoms and conjugation). Examples of networks of the polyheterocyclics-type comprise polyimides, [5][6][7] triazinecomprising polyimides, 8,9 polybenzimidazoles, [10][11][12] and poly(thiazolo thiazole)s. 13,14 The major downside of polyheterocyclics is their synthesis, which is harsh and harmful, expensive, and tedious. For example for polyimides, which lie at the center of this contribution, the conventional synthetic route proceeds via cyclocondensation reactions between dianhydrides and diamines (in the linear case) employing toxic condensation catalysts like isoquinoline (Fig.…”