Chemical cross-linking modification of polyimide membranes for gas separation (Record no. 40655)

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control field 20250625124640.0
040 ## - CATALOGING SOURCE
Transcribing agency CICY
090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN)
Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) B-6311
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245 10 - TITLE STATEMENT
Title Chemical cross-linking modification of polyimide membranes for gas separation
490 0# - SERIES STATEMENT
Volume/sequential designation Journal of Membrane Science, 189(2), p.231-239, 2001
520 3# - SUMMARY, ETC.
Summary, etc. We have developed an extremely simple room temperature chemical cross-linking technology for the modification of polyimide films for gas separations of He/N2 and O2/N2. Using 6FDA-durene as an example, chemical modification is performed by immersing the dense 6FDA-durene films in a p-xylenediamine methanol solution for a certain period of time followed by washing with fresh methanol and drying at ambient temperature. The chemical structure changes during the cross-linking process were monitored by FTIR, which indicated that imide groups were turned to amide groups during the modification process. TGA analyses showed cross-linked polyimides were thermally stable for gas separation applications. Gas permeation properties of modified polyimides to He, O2, N2 and CO2 were measured at 35°C and 10 atm. It is found that the gas permeability decreased significantly in the order of CO2>N2>O2>He with an increase in the degree of cross-linking, which were mainly attributed to the significant decreases in diffusion coefficients. The permselectivities of He/N2 and O2/N2 increased from 10 to 86 and from 4.1 to 5.9, respectively, but CO2/N2 decreased from 12 to 5.4, which suggest this cross-linking approach is most useful for the application of He/N2 and O2/N2 separations.
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element GAS-SEPARATION MEMBRANES
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element FLUOROPOLYIMIDE
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element CROSS-LINKING
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element 6FDA-DURENE POLYIMIDE
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element CHEMICAL MODIFICATION
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Liu, Y.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Wang, R.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Chung, T-Sh.
856 40 - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier <a href="https://drive.google.com/file/d/1NsNtEm1qJ4oTn_cJol_wGY85FRiP-O1X/view?usp=drivesdk">https://drive.google.com/file/d/1NsNtEm1qJ4oTn_cJol_wGY85FRiP-O1X/view?usp=drivesdk</a>
Public note Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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Source of classification or shelving scheme Clasificación local
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