Isomeric polyimides based on fluorinated dianhydrides and diamines for gas separation applications (Record no. 50511)

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control field MX-MdCICY
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control field 20250625160149.0
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-16337
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245 10 - TITLE STATEMENT
Title Isomeric polyimides based on fluorinated dianhydrides and diamines for gas separation applications
490 0# - SERIES STATEMENT
Volume/sequential designation Journal of Membrane Science, 50(3), p.285-297, 1990
520 3# - SUMMARY, ETC.
Summary, etc. The gas sorption and transport properties of two isomeric polyimides with hexafluoroisopropylidene moieties in the diamine and dianhydride monomers were characterized for a variety of gases at 35°C at pressures up to 60 atm. These materials have structural properties which inhibit intrasegmental rotational mobility and intersegmental chain packing. The effect of isomerism on the physical and gas separation properties of these rigid materials was investigated. The effect of isomerism on the hindrance to packing is reflected in the wide angle X-ray diffraction (WAXD)measurements of the average spacing between adjacent polymer chains. The para connected polyimide showed significant increases in permeability relative to a series of polyimides studied earlier with less packing-disruptive substituents on the polymer backbone. The permeability of the higher flux material was 64 barrers for CO2 and 16 barters for O2. The meta connected polyimide showed large decreases in permeability with corresponding increases in permselectivity when compared to its para counterpart. For example, the permselectivity of the meta material for O2 relative to N2 is 6.9 which is 50 percent greater than that of the para connected material. The differences in permeability and permselectivity are due to both penetrant solubility and diffusivity effects.
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element GAS TRANSPORT
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element MEMBRANE PERMEABILITY
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Coleman, M.R.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Koros, W.J.
856 40 - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier <a href="https://drive.google.com/file/d/1ljke1NsKYdJSQK0mQlylYPRqUgzcz-kj/view?usp=drivesdk">https://drive.google.com/file/d/1ljke1NsKYdJSQK0mQlylYPRqUgzcz-kj/view?usp=drivesdk</a>
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Source of classification or shelving scheme Clasificación local
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  Clasificación local     Ref1 CICY CICY Documento préstamo interbibliotecario 25.06.2025   B-16337 25.06.2025 25.06.2025 Documentos solicitados