Yuan Rongrong, Zhang Meiyu, Sun Hao
Department of Materials Science and Engineering, Jilin Jianzhu University, Changchun 130118, China.
Polymers (Basel). 2023 Mar 29;15(7):1709. doi: 10.3390/polym15071709.
A porous azo-functionalized organic polymer (JJU-2) was designed and prepared via oxidative coupling polymerization promoted by FeCl. JJU-2 exhibited reversibly stimuli-responsive CO adsorption properties as a result of the trans/cis isomerization of the polymer's azo-functionalized skeleton. Under UV irradiation and heat treatment, this porous material displayed various porous structures and CO adsorption properties. The initial Brunauer-Emmett-Teller (BET) surface area of JJU-1 is 888 m g. After UV irradiation, the BET surface area decreases to 864 m g, along with the decrease of micropores around 0.50 nm and 1.27 nm during the trans-to-cis isomerization process. In addition, CO sorption isotherms demonstrate an 8%t decrease, and the calculated Qst of CO has decreased from 29.0 kJ mol to 26.5 kJ mol due to the trans to cis conversion of the azobenzene side group. It is noteworthy that JJU-2's CO uptakes are nearly constant over three cycles of alternating external stimuli. Therefore, this azo-functionalized porous material was a potential carbon capture material that was responsive to stimuli.
通过氯化铁促进的氧化偶联聚合反应设计并制备了一种多孔偶氮功能化有机聚合物（JJU-2）。由于聚合物偶氮功能化骨架的反式/顺式异构化，JJU-2表现出可逆的刺激响应性CO吸附性能。在紫外线照射和热处理下，这种多孔材料呈现出各种多孔结构和CO吸附性能。JJU-1的初始布鲁诺尔-埃米特-泰勒（BET）表面积为888 m²/g。紫外线照射后，BET表面积降至864 m²/g，同时在反式到顺式异构化过程中，0.50 nm和1.27 nm左右的微孔减少。此外，CO吸附等温线显示减少了8%，由于偶氮苯侧基从反式转化为顺式，计算得出的CO等量吸附热从29.0 kJ/mol降至26.5 kJ/mol。值得注意的是，在三个交替外部刺激循环中，JJU-2的CO吸收量几乎保持不变。因此，这种偶氮功能化多孔材料是一种潜在的对刺激有响应的碳捕获材料。
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