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Issue 28, 2019
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Penetrating chains mimicking plant root branching to build mechanically robust, ultra-stable CO2-philic membranes for superior carbon capture

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Abstract

Rubbery CO2-philic membranes are a promising strategy for both carbon capture and hydrogen purification to meet the increasing demands of low-carbon technology owing to their preferable/fast CO2 transport and their inherently low-energy consumption. An excellent molecular chain mobility and sufficient structural softness are the keys to obtaining highly-permeable rubbery polyethylene oxide (PEO) membranes, but these properties also bring about the problem of a low mechanical strength, creating the contradiction of high permeability and the structural stability of the rubbery PEO membranes. Herein, a win–win method is presented to mimic multi-functional plant roots to branch penetrating chains with a millipede-like architecture inside CO2-philic network membranes for the simultaneous enhancement of the membrane mechanical properties, structural stability and gas transportation in one stroke. Our novel penetrating-chain-branched CO2-philic membranes exhibits improved tensile strength, better elasticity, an excellent long-term stability and ultrahigh gas permeability. The tensile strength of the membrane can be improved by up to 1.6 fold. The highest CO2 permeability reaches 1952 Barrer (increased by 363% compared to the pristine cross-linked PEO) with a high CO2/light gas selectivity (16.0 for CO2/H2 and 70.6 for CO2/N2), readily surpassing the “Robeson's upper bound” limits.

Graphical abstract: Penetrating chains mimicking plant root branching to build mechanically robust, ultra-stable CO2-philic membranes for superior carbon capture

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Supplementary files

Article information


Submitted
31 Mar 2019
Accepted
25 Apr 2019
First published
25 Apr 2019

J. Mater. Chem. A, 2019,7, 16704-16711
Article type
Paper

Penetrating chains mimicking plant root branching to build mechanically robust, ultra-stable CO2-philic membranes for superior carbon capture

X. Jiang, S. He, S. Li, Y. Bai and L. Shao, J. Mater. Chem. A, 2019, 7, 16704
DOI: 10.1039/C9TA03416A

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