carbon membranes
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2021 ◽  
Vol 174 ◽  
pp. 319-330
Author(s):  
Chen Yang ◽  
Bing Zhang ◽  
Suixin Zhang ◽  
Yonghong Wu ◽  
Tonghua Wang ◽  
...  

2021 ◽  
Vol 118 (37) ◽  
pp. e2022202118
Author(s):  
Yao Ma ◽  
Nicholas C. Bruno ◽  
Fengyi Zhang ◽  
M. G. Finn ◽  
Ryan P. Lively

Polymers of intrinsic microporosity (PIMs) have been used as precursors for the fabrication of porous carbon molecular sieve (CMS) membranes. PIM-1, a prototypical PIM material, uses a fused-ring structure to increase chain rigidity between spirobisindane repeat units. These two factors inhibit effective chain packing, thus resulting in high free volume within the membrane. However, a decrease of pore size and porosity was observed after pyrolytic conversion of PIM-1 to CMS membranes, attributed to the destruction of the spirocenter, which results in the “flattening” of the polymer backbone and graphite-like stacking of carbonaceous strands. Here, a spirobifluorene-based polymer of intrinsic microporosity (PIM-SBF) was synthesized and used to fabricate CMS membranes that showed significant increases in p-xylene permeability (approximately four times), with little loss in p-xylene/o-xylene selectivity (13.4 versus 14.7) for equimolar xylene vapor separations when compared to PIM-1–derived CMS membranes. This work suggests that it is feasible to fabricate such highly microporous CMS membranes with performances that exceed current state-of-the-art zeolites at high xylene loadings.


2021 ◽  
Vol 8 (17) ◽  
pp. 2170110
Author(s):  
Hyeokjun Seo ◽  
Sunghyun Yoon ◽  
Banseok Oh ◽  
Yongchul G. Chung ◽  
Dong‐Yeun Koh

2021 ◽  
pp. 2004999
Author(s):  
Hyeokjun Seo ◽  
Sunghyun Yoon ◽  
Banseok Oh ◽  
Yongchul G. Chung ◽  
Dong‐Yeun Koh

Carbon ◽  
2021 ◽  
Vol 176 ◽  
pp. 652-653
Author(s):  
Min-chen Hou ◽  
Lin Li ◽  
Yun-hua Lu ◽  
Xu Ran ◽  
Cheng-Wen Song ◽  
...  

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