Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 41, Pages 22322-22331Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202106740
Keywords
carbon molecular sieves; membranes; polyimides; separation; structure
Categories
Funding
- U.S. Department of Energy [DE-FG02-04ER15510]
- U.S. Department of Energy (DOE) [DE-FG02-04ER15510] Funding Source: U.S. Department of Energy (DOE)
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Carbon molecular sieve (CMS) membranes have impressive separation properties, and this study characterizes CMS with the simplest polyimide (PI) PMDA/pPDA to better understand the chemical and morphology structures. Comparisons were made with a CMS derived from a more conventional PI precursor, revealing the presence of various components in both types of CMS. The morphologies of CMS show similarities consistent with distributed molecular sieving plate-like structures, aiding in understanding the diverse CMS membrane separation performance.
Carbon molecular sieve (CMS) membranes have impressive separation properties; however, both chemical and morphology structures need to be understood better. Here we characterize CMS with the simplest polyimide (PI) PMDA/pPDA (PMDA=pyromellitic dianhydride, pPDA=p-phenylenediamine), using FTIR, solid-state N-15-NMR and C-13-NMR, XPS, XRD, and Raman spectra to study chemical structure. We also compare gas separation properties for this CMS to a CMS derived from a more conventional PI precursor. The detailed characterization shows the presence of aromatic pyridinic, pyrrolic rings as well as graphitic, pyridonic components and a few other groups in both CMS types derived from the very different precursors. The CMS morphologies, while related to precursor and pyrolysis temperature details, show similarities consistent with a physical picture comprising distributed molecular sieving plate-like structures. These results assist in understanding diverse CMS membrane separation performance.
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