In this study, mesoporous polyimide aerogels with carboxyl were successfully synthesized by the co-polymerization method at room temperature from pyromellitic dianhydride and 1,3,5-triaminophenoxybenzene, 3,5-diaminobenzoic acid, and 2,2′-dimethyl-4,4′-diaminobiphenyl. Compared to previously reported porous organic polymer materials, this aerogel has the advantage of a simple and efficient synthesis method. The thermal decomposition temperatures of the obtained polyimide aerogels are all above 400 °C and have excellent thermal stability. Among them, the largest specific surface area is 62.03 m2/g. Although the surface area of this aerogel is not large enough, it has considerable CO2 adsorption properties. The adsorption capacity of CO2 is up to 11.9 cm3/g, which is comparable to those of previously reported porous materials. The high CO2 adsorption is attributed to the abundance of carboxyl groups in the polyimide networks. The mild and convenient synthesis method and high CO2 adsorption capacity indicate that the polyimide aerogel with carboxyl is suitable as a good candidate material for CO2 adsorption.

中文翻译：

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构建用于 CO2 吸附的羧基聚酰亚胺气凝胶


本研究以均苯四酸二酐与1,3,5-三氨基苯氧基苯、3,5-二氨基苯甲酸、2,2'-二甲基-4为原料,采用室温共聚法成功合成了含羧基介孔聚酰亚胺气凝胶。 4'-二氨基联苯。与之前报道的多孔有机聚合物材料相比，该气凝胶具有合成方法简单高效的优点。所得聚酰亚胺气凝胶的热分解温度均在400℃以上，具有优异的热稳定性。其中最大比表面积为62.03 m2/g。虽然这种气凝胶的表面积不够大，但它具有相当大的CO2吸附性能。 CO2的吸附容量高达11.9 cm3/g，与之前报道的多孔材料相当。高 CO2 吸附归因于聚酰亚胺网络中丰富的羧基。温和便捷的合成方法和较高的CO2吸附容量表明，含羧基的聚酰亚胺气凝胶适合作为CO2吸附的良好候选材料。