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  • 1
    Electronic Resource
    Electronic Resource
    Facilitated oxygen transport in (polystyrene-block-polyisoprene-block-polystyrene)-graft-poly(1-vinylimidazole) containing three cobalt-containing schiff bases (1993)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 211 (1993), S. 21-34 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: (Polystyrol-block-polyisopren-block-polystyrol)-graft-poly(1-vinylimidazol) (SISg-VIm) wurde durch strahlungsinduzierte Pfropfcopolymerisatio von1-Vinylimidazol auf (Polystyrol-block-polyisopren-block-polystyrol)hergestellt und mit kobalthaltigen Schiffschen Basen (CoS) komplexiert. Aus Lösungen dieser Produkte wurden Memberanen hergestellt und untersucht. Die Koordinationszahlen und Gleichgewichtskonstanten der Komplexbildungsreaktionen sowie die thermodynamischen Parameter der Sauerstoffadorption und -desorption der Membranen wurden durch UV-VisSpektroskopie ermittelt. Die Sauerstoffdurchlässigkeiten und O2/N2-Permselektivitäten der Membranen wurden bei verschiedenen Gegenstrom-Gasdrücken und Temperaturen gemessen. Die erhöhte Sauerstoffdurchlässigkeit kann durch eine dual-modeTheorie beschrieben werden.
    Notes: Membranes of (polystyrene-block-polyisoprene-block-polystyrene)-graft-poly(1-vinyl-imidazole) (SIS-g-VIm) reacted with three cobalt-containing Schiff bases (CoS) were prepared and studied. SIS-g-VIm was obtained by radiation-induced graft copolymerization of 1-vinylimidazole onto poly(styrene-block-isoprene-block-styrene) triblock copolymer. Membranes of SIS-g-VIm reacted with three cobalt-containing Schiff bases (SIS-g-VIm-CoS) were prepared by the solution casting method. The co-ordination numbers and formation constants of these reactions were determined. Equilibrium constants and thermodynamic parameters of SIS-g-VIm-CoS membranes for binding and dissociation of oxygen were determined by UV/VIS spectroscopy. The permeability and O2/N2 permselectivity of the SIS-g-VIM-CoS membranes were measured at various upstream gas pressures and temperatures. Oxygen permeation through the SIS-g-VIm-CoS membranes can be explained by dual-mode-facilitated transport theory.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1993.052110103
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  • 2
    Electronic Resource
    Electronic Resource
    Modified styrene-isoprene-styrene block copolymer membranes complexed with cobalt-containing schiff's bases for oxygen permeation (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 217 (1994), S. 31-41 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die strahleninduzierte Pfropfpolymerisation von 4-Vinylpyridin (VP) und 1 -Vinylimidazol (VIm) auf ein Styrol-Isopren-StyroI-Blockcopolymeres (SIS) sowie die Gasdurchlässigkeit von daraus hergestellten Membranen wurde untersucht. Eine Komplexierung der modifizierten SIS-Copolymeren (SIS-g-VP bzw. SIS-g-VIm) mit Cobalt enthaltenden Schiffschen Basen (CoS) als fixierte Sauerstoffträger verbesserte deren Sauerstoffdurchlässigkeit. Der Mechanismus des Sauerstofftransports wird diskutiert.
    Notes: The grafting of 4-vinylpyridine (VP) and 1-vinylimidazole (VIm) onto styrene-isoprene-styrene (SIS) triblock copolymer by radiation-induced graft copolymerization was studied. The effect of grafting degree on gas permeability of membranes made of grafted copolymers was investigated. The complex formation of the modified SIS (SIS-g-VP or SIS-g-VIm) with cobalt-containing Schiff's bases (CoS) in chloroform solution was studied. Facilitated transport of molecular oxygen in modified SIS membranes containing CoS as fixed carrier of oxygen, and oxygen permeability in modified SIS membranes due to the oxygen binding ability to CoS was observed. Mechanism of oxygen transport across the SIS-g-VP-CoS and SIS-g-VIm-CoS membrane is discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1994.052170104
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