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 15N-NMR and 13C-NMR, XPS, XRD, and Raman spectra to study chemical structure. Here 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.
Qiu, Wulin, et al. "Key Features of Polyimide-Derived Carbon Molecular Sieves." Angewandte Chemie (International Edition), vol. 60, no. 41, Aug. 2021. https://doi.org/10.1002/anie.202106740
Qiu, Wulin, Leisen, Johannes E., Liu, Zhongyun, Quan, Wenying, & Koros, William J. (2021). Key Features of Polyimide-Derived Carbon Molecular Sieves. Angewandte Chemie (International Edition), 60(41). https://doi.org/10.1002/anie.202106740
Qiu, Wulin, Leisen, Johannes E., Liu, Zhongyun, et al., "Key Features of Polyimide-Derived Carbon Molecular Sieves," Angewandte Chemie (International Edition) 60, no. 41 (2021), https://doi.org/10.1002/anie.202106740
@article{osti_1976267,
author = {Qiu, Wulin and Leisen, Johannes E. and Liu, Zhongyun and Quan, Wenying and Koros, William J.},
title = {Key Features of Polyimide-Derived Carbon Molecular Sieves},
annote = {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 15N-NMR and 13C-NMR, XPS, XRD, and Raman spectra to study chemical structure. Here 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.},
doi = {10.1002/anie.202106740},
url = {https://www.osti.gov/biblio/1976267},
journal = {Angewandte Chemie (International Edition)},
issn = {ISSN 1433-7851},
number = {41},
volume = {60},
place = {United States},
publisher = {Wiley},
year = {2021},
month = {08}}
