Novel 6FDA-based polyimides derived from sterically hindered Troger's base diamines: Synthesis and gas permeation properties

POLYMER

卷:96

Article

Ghanem, Bader¹  Alaslai, Nasser¹  Miao, Xiaohe²  Pinnau, Ingo¹ 

[1] King Abdullah Univ Sci & Technol, Adv Membranes & Porous Mat Ctr, Div Phys Sci & Engn, Chem & Biol Engn Program, Thuwal 239556900, Saudi Arabia

[2] King Abdullah Univ Sci & Technol, Imaging & Characterizat Core Lab, Thuwal 239556900, Saudi Arabia

关键词: Troger's base polyimides;    Methyl/bromine-substituted diamines;    Gas permeation;   

DOI  :  10.1016/j.polymer.2016.04.068

来源: Elsevier

【 摘 要 】

Two novel Troger's base-based di-o-substituted diamine monomers were synthesized and used to prepare two intrinsically microporous 6FDA-based polyimides (PIM-PI-TB-1 and PIM-PI-TB-2) with high molecular weight, high thermal stability and excellent solubility in common organic solvents. Compared to previously reported methods for preparing TB-based diamines, which are based on reduction of dimerized nitro-substituted anilines or condensation of phenylenediamine derivatives with dianhydrides, the novel protocol can be used to prepare different functionalized TB-based diamine monomers from a wide variety of aniline derivatives. PIM-PI-TB-1 (made from 6FDA and dibromo-tetramethyl-substituted TB diamine) and PIM-PI-TB-2 (made from 6FDA and tetramethyl-substituted TB diamine) are intrinsically microporous polymers with high BET surface areas of 440 m(2)/g and 580 m(2)/g, respectively. Pure-gas permeability coefficients of He, H-2, N-2, O-2, CH4, and CO2 were measured at 35 degrees C and 2 bar for fresh and 180 days aged films. Both TB-based polyimides exhibited high gas permeability with moderate selectivity. The gas permeability dropped significantly coupled with a moderate increase in selectivity after long-term physical aging of 180 days. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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