巴勒
聚合物
膜
多孔性
磁导率
化学工程
选择性
多孔介质
材料科学
气体分离
氢
高分子化学
化学
有机化学
复合材料
催化作用
生物化学
工程类
作者
Cher Hon Lau,Kristina Konstas,Aaron W. Thornton,Amelia C. Y. Liu,Stephen Mudie,Danielle F. Kennedy,Shaun C. Howard,Anita J. Hill,Matthew R. Hill
标识
DOI:10.1002/anie.201410684
摘要
Abstract Porosity loss, also known as physical aging, in glassy polymers hampers their long term use in gas separations. Unprecedented interactions of porous aromatic frameworks (PAFs) with these polymers offer the potential to control and exploit physical aging for drastically enhanced separation efficiency. PAF‐1 is used in the archetypal polymer of intrinsic microporosity (PIM), PIM‐1, to achieve three significant outcomes. 1) hydrogen permeability is drastically enhanced by 375 % to 5500 Barrer. 2) Physical aging is controlled causing the selectivity for H 2 over N 2 to increase from 4.5 to 13 over 400 days of aging. 3) The improvement with age of the membrane is exploited to recover up to 98 % of H 2 from gas mixtures with N 2 . This process is critical for the use of ammonia as a H 2 storage medium. The tethering of polymer side chains within PAF‐1 pores is responsible for maintaining H 2 transport pathways, whilst the larger N 2 pathways gradually collapse.
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