Simple synthesis of porous melamine-formaldehyde resins by low temperature solvothermal method and its CO2 adsorption properties

Abstract

Abstract.A simple and environmentally-friendly approach for the preparation of porous melamine-formaldehyde resins (PMFRs) was developed by using low-boiling-point solvents, such as water, as pore-forming agent. With using dimethyl sulfoxide (DMSO) and low-boiling solvents cosolvent method, PMFRs with a high specific surface area and well-defined pore structure can be synthesized at a low reaction temperature of 140°C for a short reaction duration in 20 hours, which can replace the conventional methods that use dimethyl sulfoxide (DMSO) as reaction medium and require 3 days at 170°C to achieve similar surface area. When loaded with polyethylenimine (PEI), the PMFR-PEI-30% showed good CO 2 adsorption performance with a capacity of up to 2.89 mmol/g at 30°C. These results bring new perspectives for the development of lowcost and environmentally-friendly synthetic methods for porous materials, which can boost their widespread applications.

Mesoporous Melamine-Formaldehyde Resins as Efficient Heterogeneous Catalysts for Continuous Synthesis of Cyclic Carbonates from Epoxides and Gaseous CO2

“…Nevertheless, both materials are characterized by a polymeric structure consisting of a network of melamine rings interconnected by both ether and methylene linkages (Scheme ) with abundant triazine, primary, secondary, and tertiary amine sites, which can act as potential sites for CO 2 activation (Table and Figures and ). To summarize our results, it can be concluded that the S-free porous melamine-formaldehyde materials (MMFR and MMFR250) obtained by the template-free and organosolvent-free route exhibit a mesoporous structure with large amounts of uniformly distributed basic N-sites, which closely resemble the templated and solvothermal-templated porous melamine polymers reported in earlier works. − With advantages such as simple synthesis, low cost, high specific surface area (>300 m 2 /g), large mesopores (>20 nm), abundance of N (basic) sites, and good thermal stability ( T onset ∼300 vs 200 °C), these polymeric materials are potential catalysts for CO 2 activation and the production of cyclic carbonates from CO 2 and epoxides.…”

“…Thus, developing a cost-effective (template-free and organosolvent-free) approach for fabrication of porous melamine-formaldehyde resins is highly desirable. While there are several publications demonstrating the application of porous poly-melamine-formaldehyde resins for CO 2 capture, ,− only one report could be found describing the catalytic use of a melamine-formaldehyde resin for cyclic carbonate production . However, the reported material was modified with zinc and exhibited catalytic activity only in the presence of tetrabutylammonium bromide (TBAB) as a co-catalyst, and the activity of porous poly-melamine-formaldehyde resin itself was negligible .…”

Improving iodine adsorption performance of porous organic polymers by rational decoration with nitrogen heterocycle

“…Meanwhile the peaks locating between 40 and 70 ppm could be assigned to the sp 3 carbon of aminal groups. 38,39 Furthermore, the signals appearing in the range from 100 to 157 ppm could be assigned to the sp 2 carbon of residual aldehydes. So it is confirmed by FTIR and 13 C-NMR spectra that the aminal-linked polymers was successfully constructed.…”

Fabrication of PEI‐grafted porous polymer foam for CO2 capture

“…Nevertheless, the longer PEI chain carried more NH 2 groups onto the foam surface, and the CO 2 uptake was still more than its low‐molecular‐weight counterparts, because CO 2 chemisorption uptake was mainly determined by amine content. As a result, the highest capturing capacity of PAA‐PEI (10000) reached to 5.91 mmol g −1 , which was greater than the report capacity of 2.37 mmol CO 2 g −1 of porous melamine‐formaldehyde resins and 13.86 mg CO 2 g −1 of BTC‐based metal–organic frameworks …”