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In Situ Growth of Crystalline and Polymer-Incorporated Amorphous ZIFs in Polybenzimidazole Achieving Hierarchical Nanostructures for Carbon Capture

Journal Article · · Small
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [3];  [1]
  1. State University of New York (SUNY), Buffalo, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. University of Colorado, Boulder, CO (United States)
  4. State University of New York (SUNY), Buffalo, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
We report mixed matrix materials (MMMs) hold great potential for membrane gas separations by merging nanofillers with unique nanostructures and polymers with excellent processability. In situ growth of the nanofillers is adapted to mitigate interfacial incompatibility to avoid the selectivity loss. Surprisingly, functional polymers have not been exploited to co-grow the nanofillers for membrane applications. Herein, in situ synergistic growth of crystalline zeolite imidazole framework-8 (ZIF-8) in polybenzimidazole (PBI), creating highly porous structures with high gas permeability, is demonstrated. More importantly, PBI contains benzimidazole groups (similar to the precursor for ZIF-8, i.e., 2-methylimidazole) and induces the formation of amorphous ZIFs, enhancing interfacial compatibility and creating highly size-discriminating bottlenecks. For instance, the formation of 15 mass% ZIF-8 in PBI improves H-2 permeability and H-2/CO2 selectivity by approximate to 100% at 35 degrees C, breaking the permeability/selectivity tradeoff. This work unveils a new platform of MMMs comprising functional polymer-incorporated amorphous ZIFs with hierarchical nanostructures for various applications.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0012704; FE0031636
OSTI ID:
1887818
Alternate ID(s):
OSTI ID: 1867725
Report Number(s):
BNL-223349-2022-JAAM
Journal Information:
Small, Journal Name: Small Journal Issue: 23 Vol. 18; ISSN 1613-6810
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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