| In according to Schiff reaction mechanism, under the conditions of high temperature and no catalyst, using melamine and terephthaladehyde as raw materials, polycondensation occurs in dimethyl sulfoxide (DMSO) solvent and produces three dimensional network polymer, microporous SNW resin. Then based on the synthesis of powder, using methylsilicone oil as continuous phase and polyethylene pyrrole (PVP, K-30) as surfactant, microporous polymer microspheres are synthesized. In addition, adsorption performance of the materials on CO2 is also preliminarily explored. The results show that:1) In the appropriate technology condition, polymer with BET surface area of 750m2/g generates, characterized by levels of pore structure "macroporous- mesoporous-microporous" and chemical structure of aminal crosslinking with rigid structure.2) Combined with the chemical structure and physical structure as gel of this material, the formation mechanism of pore structure is put forward by the simulation of Materials Studio software. The different orientation of rigid structure leaded by electronic rejection and structural circles generated by cross-linking mainly produce macropore, while mesopore and micropore are mostly produced by mutual accumulation of gel particle on the nanometer scale.3) Microporous monodisperse spherical polmers are synthesized by suspension polymerization. The best technical process conditions:while the volume ratio of solvent/continuous phase is about 25%, formation rate of microspheres is about 80%; the quality ratio of PVP (based on quality of reactants, CPVP, wt%) is 8%-12%; in addition, the rotating speed is 250rpm.4) SNW resin powder also has considerable amount of adsorption capacity, and the highest absorption capacity of CO2 is 2.2mmol/g (20℃); adsorption process is mainly physical adsorption, incorporated with chemical adsorption; desorption can be finished completely under 100℃within 20 min; adsorption performance within circulation of 5 times is comparatively stable. |
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