气候变化领域集成服务门户(CCPortal): Pentiptycene-based ladder polymers with configurational free volume for enhanced gas separation performance and physical aging resistance

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DOI	10.1073/pnas.2022204118
	Pentiptycene-based ladder polymers with configurational free volume for enhanced gas separation performance and physical aging resistance
	Corrado T.J.; Huang Z.; Huang D.; Wamble N.; Luo T.; Guo R.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:37
英文摘要	Polymers of intrinsic microporosity (PIMs) have shown promise in pushing the limits of gas separation membranes, recently redefining upper bounds for a variety of gas pair separations. However, many of these membranes still suffer from reductions in permeability over time, removing the primary advantage of this class of polymer. In this work, a series of pentiptycene-based PIMs incorporated into copolymers with PIM-1 are examined to identify fundamental structure-property relationships between the configuration of the pentiptycene backbone and its accompanying linear or branched substituent group. The incorporation of pentiptycene provides a route to instill a more permanent, configuration-based free volume, resistant to physical aging via traditional collapse of conformation-based free volume. PPIM-ip-C and PPIM-np-S, copolymers with C- and S-shape backbones and branched isopropoxy and linear n-propoxy substituent groups, respectively, each exhibited initial separation performance enhancements relative to PIM-1. Additionally, aging-enhanced gas permeabilities were observed, a stark departure from the typical permeability losses pure PIM-1 experiences with aging. Mixed-gas separation data showed enhanced CO2/CH4 selectivity relative to the pure-gas permeation results, with only ∼20% decreases in selectivity when moving from a CO2 partial pressure of ∼2.4 to ∼7.1 atm (atmospheric pressure) when utilizing a mixed-gas CO2/CH4 feed stream. These results highlight the potential of pentiptycene's intrinsic, configurational free volume for simultaneously delivering size-sieving above the 2008 upper bound, along with exceptional resistance to physical aging that often plagues high free volume PIMs. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Gas separation membranes; Iptycenes configurational free volume; Ladder polymers; Physical aging
语种	英语
scopus关键词	carbon dioxide; pentiptycene polymer; polymer; unclassified drug; Article; atmospheric pressure; chemical structure; controlled study; gas permeability; gas separation; partial pressure; substitution reaction; synthesis
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/238401
作者单位	Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, United States; Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN 46556, United States
推荐引用方式 GB/T 7714	Corrado T.J.,Huang Z.,Huang D.,et al. Pentiptycene-based ladder polymers with configurational free volume for enhanced gas separation performance and physical aging resistance[J],2021,118(37).
APA	Corrado T.J.,Huang Z.,Huang D.,Wamble N.,Luo T.,&Guo R..(2021).Pentiptycene-based ladder polymers with configurational free volume for enhanced gas separation performance and physical aging resistance.Proceedings of the National Academy of Sciences of the United States of America,118(37).
MLA	Corrado T.J.,et al."Pentiptycene-based ladder polymers with configurational free volume for enhanced gas separation performance and physical aging resistance".Proceedings of the National Academy of Sciences of the United States of America 118.37(2021).