微型多孔材料
杂原子
多孔性
吸附
化学工程
分离(统计)
化学
材料科学
有机化学
计算机科学
机器学习
工程类
戒指(化学)
作者
Biao Zhang,Jun Yan,Zhonggang Wang
标识
DOI:10.1021/acs.jpcc.8b03031
摘要
Three hyper-cross-linked microporous polybenzoxazoles (PBO-M, PBO-Ad, and PBO-Si) with uniform pores are synthesized through "one-pot" condensation polymerizations from 3,3′-diamino-4,4′-dihydroxybiphenyl with tetrakis(4-formylphenyl)methane, 1,3,5,7-tetrakis(4-formyphenyl)adamantane, and tetrakis(4-formylphenyl)silane, respectively. Their porosity parameters and chemical compositions, such as microporous sizes (0.98–1.46 nm), ratios of microporous volume to total porous volume (0.36–0.53), ratios of O/C (0.156–0.195), and N/C (0.079–0.095), are finely tunable. The adsorption properties of CO2, N2, and CH4 measured through the static adsorption isotherms of single-component gases and dynamic breakthrough curves are comparatively studied. Among the three polymers, PBO-M possesses the smallest pore size and the highest concentrations of heteroatoms, and consequently shows the largest CO2 adsorption capacity (11.6 wt %, 273 K/1 bar) and highest separation factors of CO2/N2 (96.6) and CO2/CH4 (12.4). The results are interpreted in terms of the porous structure, isosteric enthalpies of adsorption, and the physicochemical parameters of polymer skeletons and gases in detail.
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