1997
DOI: 10.1021/jp963997u
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Gas Permeation through Micropores of Carbon Molecular Sieve Membranes Derived from Kapton Polyimide

Abstract: The evolution of micropores and the gas permeation properties have been investigated on carbon molecular sieve dense membranes prepared by pyrolysis of Kapton polyimide films under several conditions. With decreasing the pore sizes upon pyrolization under vacuum, the gas permeability decreased, whereas the permselectivity increased. The change in the heating rate was found to affect the permeation properties to a lesser extent; however, the pyrolysis atmosphere (vacuum or inert purge pyrolysis) did not appreci… Show more

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Cited by 328 publications
(196 citation statements)
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“…This result demonstrated the carbon-carbon spacing, which is recognized by d-spacing in graphite planes. Similar results have been reported elsewhere [1,2,17]. Hypothetically, the conjugate aromatic graphitic structure was formed and CMSMs show the graphite nature of high selectivity.…”
Section: Gas Permeation Measurementssupporting
confidence: 89%
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“…This result demonstrated the carbon-carbon spacing, which is recognized by d-spacing in graphite planes. Similar results have been reported elsewhere [1,2,17]. Hypothetically, the conjugate aromatic graphitic structure was formed and CMSMs show the graphite nature of high selectivity.…”
Section: Gas Permeation Measurementssupporting
confidence: 89%
“…3(c)). Unfortunately, the evolution of O 2 ,N 2 and H 2 from the polymer during the pyrolysis, as commented by other studies [17,21], could not be monitored by FTIR. However, it was certainly true that the thermal degradation of polyimides during pyrolysis produced CO 2 , CO, O 2 ,N 2 , [17,21,33].…”
Section: Gas Permeation Measurementsmentioning
confidence: 96%
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“…8 and Table 5; highest permeance are observed for samples carbonized at 500 and 550 o C. These carbon membranes show higher permeance for H2 than for He despite of H2 being larger than helium (0.29 and 0.26 nm for H2 and He, respectively) [74]; this was attributed to the larger adsorption affinity of H2 [40] and to the cross-section diameter of H2, which is smaller. In Fig 9 the The values of Ea of c-CMSM-500-5m for N2, O2, He, H2 and CO2 are listed in Table 6 and illustrated in Fig.…”
Section: Effect Of Carbonization End Temperature On the Permeation Ofmentioning
confidence: 99%
“…Zeolites, carbon molecular sieves (CMS) and metal oxides are various types of inorganic materials that are widely used in the preparation of nanocomposite membranes. These fillers provide great performance for gas separation processes (Te Hennepe, 1998;Suda and Haraya, 1997;Moaddeb and Koros, 1997;Hu et al, 1997).…”
Section: Introductionmentioning
confidence: 99%