Polymers with Side Chain Porosity for Ultrapermeable and Plasticization Resistant Materials for Gas Separations
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- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Bologna (Italy)
- Univ. of Chinese Academy of Sciences, Shanghai (China). Shanghai Inst. of Organic Chemistry, Key Lab. for Organofluorine Chemistry Center for Excellence in Molecular Synthesis
- Univ. of Bologna (Italy)
Abstract Polymer membranes with ultrahigh CO 2 permeabilities and high selectivities are needed to address some of the critical separation challenges related to energy and the environment, especially in natural gas purification and postcombustion carbon capture. However, very few solution‐processable, linear polymers are known today that access these types of characteristics, and all of the known structures achieve their separation performance through the design of rigid backbone chemistries that concomitantly increase chain stiffness and interchain spacing, thereby resulting in ultramicroporosity in solid‐state chain‐entangled films. Herein, the separation performance of a porous polymer obtained via ring‐opening metathesis polymerization is reported, which possesses a flexible backbone with rigid, fluorinated side chains. This polymer exhibits ultrahigh CO 2 permeability (>21 000 Barrer) and exceptional plasticization resistance (CO 2 plasticization pressure > 51 bar). Compared to traditional polymers of intrinsic microporosity, the rate of physical aging is slower, especially for gases with small effective diameters (i.e., He, H 2 , and O 2 ). This structural design strategy, coupled with studies on fluorination, demonstrates a generalizable approach to create new polymers with flexible backbones and pore‐forming side chains that have unexplored promise for small‐molecule separations.
- Research Organization:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of California, Oakland, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0019087; AC02-05CH11231; DE‐AC02‐05CH11231; DE‐SC0019087
- OSTI ID:
- 1613104
- Alternate ID(s):
- OSTI ID: 1505865
- Journal Information:
- Advanced Materials, Vol. 31, Issue 21; ISSN 0935-9648
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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