An integrated materials approach to ultrapermeable and ultraselective CO2 polymer membranes

Pulling carbon dioxide out of the airA challenge in the design of polymeric membranes for gas separation is the tradeoff between permeability, or how fast gases can flow through the membrane, and selectivity, the ability to separate one gas from another. In general, the more selective the membrane,...

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Published inScience (American Association for the Advancement of Science) Vol. 376; no. 6588; pp. 90 - 94
Main Authors Sandru, Marius, Sandru, Eugenia M, Ingram, Wade F, Deng, Jing, Stenstad, Per M, Deng, Liyuan, Spontak, Richard J
Format Journal Article
LanguageEnglish
Published Washington The American Association for the Advancement of Science 01.04.2022
Subjects
Carbon dioxide
Elastomers
Gas separation
Gases
Membrane permeability
Membranes
Polyacrylonitrile
Polydimethylsiloxane
Polymers
Polytetrafluoroethylene
Selectivity
Tradeoffs
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Summary:Pulling carbon dioxide out of the airA challenge in the design of polymeric membranes for gas separation is the tradeoff between permeability, or how fast gases can flow through the membrane, and selectivity, the ability to separate one gas from another. In general, the more selective the membrane, the more slowly gases can flow through it. Sandru et al. overcame this tradeoff through a layered design. They used a bottom layer of porous polyacrylonitrile that acts as a physical support for the middle layer of either elastomer-like polydimethylsiloxane or glassy-type polytetrafluoroethylene. The authors then grafted a patchy layer of polyvinylamine, which selectively attracts carbon dioxide, thus pulling it into the membrane and leading to much higher separation from nitrogen. —MSL
Bibliography:ObjectType-Article-1
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ISSN:0036-8075
1095-9203
DOI:10.1126/science.abj9351