In this study, we prepared nitrogen-doped microporous carbons (NMCs) from two different benzoxazine monomers (AMBZ, AEBZ), each containing both azobenzene and carboxylic groups, through a simple and environmentally friendly process of ring-opening polymerization (ROP), calcination, and KOH activation. We synthesized the AMBZ and AEBZ monomers through Mannich condensations of 4,4′-diaminodiphenylmethane (M) and 4,4′-diaminodiphenyl ether (E), respectively, with paraformaldehyde and 4-(4-hydroxphenylazo)benzoic acid (Azo-COOH). Differential scanning calorimetry (DSC) revealed that the thermal curing temperatures of AMBZ and AEBZ (both ca. 230 °C) were lower than that of a typical Pa-type benzoxazine monomer (263 °C), suggesting that the azobenzene and COOH units acted as promoters and catalysts for the ROP of the benzoxazine units. In addition, after ROP of the benzoxazine units of AMBZ and AEBZ, the polymers PAMBZ and PAEBZ, respectively, displayed high glass transition temperatures (T_g) and high thermal stability, as evidenced using DSC and thermogravimetric analysis (TGA), due to their greater cross-linking densities. We used Brunauer–Emmett–Teller analysis, TGA, wide-angle X-ray diffraction, transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy to examine the specific surface areas, porous structures, chemical compositions, and thermal stabilities of the resulting KOH-activated NMCs PAMBZ-A and PAEBZ-A. The CO₂ capture abilities and thermal properties of these two highly-nitrogen-doped microporous carbons, synthesized from polybenzoxazine (PBZ) resins containing azobenzene and COOH groups, were excellent when compared with those of other N-doped porous carbons derived from other PBZ matrices.

在这项研究中，我们通过开环聚合（ROP）的简单且环境友好的方法，从两种不同的苯并恶嗪单体（AMBZ，AEBZ）制备了氮掺杂的微孔碳（NMC），每种单体均包含偶氮苯和羧基。和KOH激活。我们分别通过4,4'-二氨基二苯甲烷（M）和4,4'-二氨基二苯醚（E）的曼尼希缩合反应与低聚甲醛和4-（4-羟基苯偶氮）苯甲酸（Azo-COOH）合成AMBZ和AEBZ单体）。差示扫描量热法（DSC）显示，AMBZ和AEBZ的热固化温度（均为约230°C）均低于典型的Pa型苯并恶嗪单体（263°C），表明偶氮苯和COOH单元起作用作为苯并恶嗪单元ROP的促进剂和催化剂。此外，DSG和热重分析（TGA）证明了T _g）和高热稳定性，因为它们具有更高的交联密度。我们使用了Brunauer–Emmett–Teller分析，TGA，广角X射线衍射，透射电子显微镜，拉曼光谱和X射线光电子能谱来检查比表面积，多孔结构，化学成分和热稳定性。产生的KOH活化NMC PAMBZ-A和PAEBZ-A。与包含其他PBZ基质的其他N掺杂多孔碳相比，这两种由含偶氮苯和COOH基团的聚苯并恶嗪（PBZ）树脂合成的这两种高氮掺杂微孔碳的CO ₂捕获能力和热性质非常出色。 。