膜
分子筛
气体分离
聚合物
聚合
材料科学
高分子化学
微观结构
渗透
界面聚合
化学工程
支柱
化学
单体
有机化学
复合材料
催化作用
生物化学
工程类
结构工程
作者
Woochul Song,Jaesung Park,Subhadeep Dasgupta,Chenhao Yao,Nikhil Maroli,Harekrushna Behera,Xinyang Yin,Durga P. Acharya,Xueyi Zhang,Cara M. Doherty,Prabal K. Maiti,Benny D. Freeman,Manish Kumar
标识
DOI:10.1021/acs.chemmater.2c01450
摘要
Molecular sieve membranes and their analogues could potentially transform energy-intensive gas separation processes. However, many such membranes suffer from either limited processability or physical stability including plasticization of semi-flexible microstructures. Here, we report on a new variation of all-polymer-based molecular sieve membranes that could tackle these specific challenges. These membranes were prepared by the interfacial polymerization of pillar[5]arene, m-phenylenediamine, and trimesoyl chloride to create characteristic poly(arylate-amide) heteropolymer microstructures. Pillar[5]arenes were crosslinked into the films with net weight fractions of up to ∼47%, wherein the 4.7 Å cavities of pillar[5]arenes were interconnected with ∼2.8 Å apertures. These microstructures provided preferred permeation paths for smaller molecules (He and H2) among the tested light gases (He, H2, CO2, O2, N2, and CH4) and resulted in significant molecular sieving effects with representative pure gas selectivities of 32 (H2/CO2), 150 (CO2/CH4), 4600 (H2/CH4), 13 (O2/N2), and 4.7 (N2/CH4) at 35 °C and 10 atm. These separation factors outperform most polymer-based gas separation membranes, while providing membrane features such as thin film barriers, cross-linked polymer backbones, and excellent processability resulting from interfacial polymerization that are critical for large-scale operations.
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