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DOI	10.1073/pnas.2022202118
	Zeolite-like performance for xylene isomer purification using polymer-derived carbon membranes
	Ma Y.; Bruno N.C.; Zhang F.; Finn M.G.; Lively R.P.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:37
英文摘要	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 National Academy of Sciences. All rights reserved.
英文关键词	Carbon; Membranes; Polymers; Pyrolysis; Xylene
语种	英语
scopus关键词	fluorene; polymer; polymer of intrinsic microporosity; spirobifluorene; unclassified drug; xylene; zeolite; Article; artificial membrane; carbon molecular sieve membrane; isomer; membrane permeability; polymerization; pore size; porosity; purification; pyrolysis; vapor
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238395
作者单位	School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States; School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, United States
推荐引用方式 GB/T 7714	Ma Y.,Bruno N.C.,Zhang F.,et al. Zeolite-like performance for xylene isomer purification using polymer-derived carbon membranes[J],2021,118(37).
APA	Ma Y.,Bruno N.C.,Zhang F.,Finn M.G.,&Lively R.P..(2021).Zeolite-like performance for xylene isomer purification using polymer-derived carbon membranes.Proceedings of the National Academy of Sciences of the United States of America,118(37).
MLA	Ma Y.,et al."Zeolite-like performance for xylene isomer purification using polymer-derived carbon membranes".Proceedings of the National Academy of Sciences of the United States of America 118.37(2021).