A series of highly nitrogen-rich microporous polymers are prepared from triazine-based tetraamines (p-BzDAT and m-BzDAT) and hexaamine (TMBDAT) with formamide (MF) and N,N-dimethylformamide (DMF). p-BzDAT and m-BzDAT are isomers with two triazinediamines para- and meta-substituted on a benzene ring, respectively, whereas TMBDAT has three triazinediamines 1,3,5-substituted on trimethylbenzene. The different geometry configurations and functionalities of the starting monomers result in tunable Brunauer–Emmett–Teller areas and pore sizes in the ranges of 842–1227 m² g^–1 and 0.53–3.82 nm, respectively. The synergistic effects of porosity parameters and CO₂-philic groups including triazine rings and various amines in the porous polymer networks on CO₂ adsorption and separations are systematically studied. Of interest is the observation that the sample derived from DMF and p-BzDAT displays simultaneously high CO₂ uptake of 20.3 wt % and a dynamic CO₂/N₂ separation factor of 127.6 at 1 bar/273 K, which overcomes the adsorption selectivity trade-off dilemma often encountered in the previous studies, showing promising applications in the CO₂ sequestration field.

中文翻译：

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使用N，N-二甲基甲酰胺和甲酰胺作为起始单体进行CO ₂吸附和分离的高度富氮微孔聚酰胺

一系列高度富氮的微孔聚合物是从三嗪系四胺（制备p -BzDAT和米-BzDAT）和六胺（TMBDAT）与甲酰胺（MF）和Ñ，Ñ二甲基甲酰胺（DMF）。p -BzDAT和m -BzDAT是分别在苯环上对位和间位被两个三嗪二胺取代的异构体，而TMBDAT在三甲基苯上具有三个被三嗪二胺1,3,5-取代的异构体。起始单体的不同几何构型和功能性导致可调节的Brunauer-Emmett-Teller面积和孔径范围在842-1227 m ² g ^–1之间和分别为0.53–3.82 nm。系统地研究了孔隙率参数与多孔聚合物网络中三嗪环和各种胺类的CO _2-亲电基团对CO ₂吸附和分离的协同作用。有趣的是，观察到来自DMF和p -BzDAT的样品在1 bar / 273 K下同时显示20.3 wt％的高CO ₂吸收和127.6的动态CO ₂ / N ₂分离因子，这克服了吸附选择性贸易。在先前的研究中经常遇到脱位困境，这表明在CO ₂固存领域中有希望的应用。