Microporous Polyimides with Uniform Pores for Adsorption and Separation of CO2 Gas and Organic Vapors

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• 作者：Guiyang Li ; Zhonggang Wang
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：April 23, 2013
• 年：2013
• 卷：46
• 期：8
• 页码：3058-3066
• 全文大小：550K
• 年卷期：v.46,no.8(April 23, 2013)
• ISSN：1520-5835

文摘

Three microporous polyimides, MPI-1, MPI-2, and MPI-3, with uniform pores were synthesized via one-pot polycondensation from tetrakis(4-aminophenyl)methane, tris(4-aminophenyl)amine and 1,3,5-tris(4-aminophenyl)benzene with pyromellitic dianhydride, respectively. The amorphous networks exhibit excellent thermal stability, large BET surface areas up to 1454 m² g^鈥?, and narrow pore size distribution in the range from 5 to 6 脜. Their adsorption鈥揹esorption isotherms of CO₂ are reversible, and the CO₂ uptakes at 273 K and 1 bar are up to 16.8 wt %. Moreover, based on the ratios of initial slopes of isotherms, the CO₂/N₂ and CO₂/CH₄ separation factors are as high as 102 and 12, respectively. The above CO₂ adsorption and separation properties are attributed to the presence of abundant electron-rich heteroatoms in the polyimide networks and the unifrom ultralmicroporous structures. In addition, for MPI-1, the adsorption capacity of benzene vapor is 119.8 wt %, while the separation factors of benzene over nitrogen and water reach 342 and 28, respectively. The outstanding selective adsorptions of CO₂ gas and benzene vapor endow the microporous polyimides with promising potential in CO₂ capture and separation as well as air- and water-cleaning applications.