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  • 1
    Electronic Resource
    Electronic Resource
    Styrene-divinylbenzene copolymers. Construction of porosity in styrene divinylbenzene matrices (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 2835-2846 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Experimental data are presented describing the formation of porosity in styrene-divinylbenzene copolymers as a function of the organic components present during the suspension polymerization. The reaction system contains a mixture of diluents such as toluene and hexane, which results in matrices that differ significantly in pore structure from the porous resins so far known. From these data a model of the physical structure is proposed.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170920
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of aqueous solutions of thiocyanic acid and their stability (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 276 (1975), S. 117-120 
    Details
    ISSN: 1618-2650
    Keywords: Herstellung von Thiocyansäurelösungen ; Stabilitätsuntersuchungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Various procedures for the preparation of aqueous HNCS solutions have been investigated. Reaction of equimolar amounts of Ba(NCS)2 and H2SO4, and subsequent separation of BaSO4 by centrifugation, yields highly pure (≥ 99%) HNCS solutions. When kept at a temperature of 4° C, 1–2 M solutions are stable for a period of 10–20 days.
    Notes: Zusammenfassung Verschiedene Verfahren zur Herstellung von wäßrigen HNCS-Lösungen wurden untersucht. Hochreine Lösungen (≥ 99%) können durch Reaktion von äquimolaren Mengen Ba(NCS)2 und H2SO4 und anschließende Abtrennung des BaSO4 durch Zentrifugieren hergestellt werden. Bei 4° C sind 1–2 M Lösungen 10–20 Tage lang beständig.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01165814
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The extraction of manganese (II) from aqueous thiocyanate solutions with liquid anion-exchangers (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 138-141 
    Details
    ISSN: 1618-2650
    Keywords: Extraktion von Mangan(II) aus Thiocyanatlösung ; flüssiger Ionenaustauscher
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Manganese(II) is efficiently extracted from acidified thiocyanate solutions by alamine and, even more effectively, aliquat dissolved in e.g. toluene or CCl4. The metal-containing species present in the organic extracts is Mn(NCS) 4 2− .
    Notes: Zusammenfassung Mit Hilfe von Alamin oder besser Aliquat, gelöst z.B. in Toluol oder Tetrachlorkohlenstoff, kann Mangan(II) mit gutem Erfolg aus sauren Thiocyanatlösungen extrahiert werden. Mn ist in den organischen Extrakten als Mn(NCS) 4 2− enthalten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00439855
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  • 4
    Electronic Resource
    Electronic Resource
    Extraction of cobalt(II) from aqueous thiocyanate and chloride solutions with alamine, alamine oxide and tri-n-octylphosphine oxide (1978)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 289 (1978), S. 358-365 
    Details
    ISSN: 1618-2650
    Keywords: Extraktion von Kobalt(II) ; Thiocyanat- und Chloridlösungen mit Alamin, Alaminoxid und TOPO
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The extraction of Co(II) from KNCS, HNCS, LiCl and HCl solutions with Alamine 336-S, Alamine oxide and tri-n-octylphosphine oxide has been studied. For acid-deficient systems, the extraction efficiency decreases in the order AlamO 〉 TOPO 〉 Alamine, while the sequence is Alamine 〉 AlamO 〉 TOPO for extraction from acid solutions. Under acid-deficient conditions, extraction invariably proceeds through solvation. On the other hand, in the systems Alamine-HCl and -HNCS as well as AlamO-HCl, extraction is governed by anion-exchange. A mixed extraction mechanism occurs with the AlamO-HNCS, TOPO-HCl and TOPO-HNCS systems. The conclusions reported for liquid-extraction also appear to apply to reversed-phase thin-layer chromatography.
    Notes: Zusammenfassung Die Extraktion von Kobalt(II) aus KNCS-, HNCS-, LiCl- und HCl-Lösungen mit Alamin 336-S, Alaminoxid und Tri-n-octylphosphinoxid wurde untersucht. Im Falle von nichtsauren Systemen nimmt die Extrahierbarkeit in der Reihenfolge AlamO 〉 TOPO 〉 Alamin ab, während für saure Systeme die Reihenfolge Alamin 〉 AlamO 〉 TOPO gilt. Unter nichtsauren Bedingungen erfolgt die Extraktion stets durch Solvatation, wogegen in den Systemen Alamin-HCl, Alamin-HNCS sowie AlamO-HCl Anionenaustausch maßgebend ist. Gemischte Extraktionsmechanismen herrschen in den Systemen AlamO-HNCS, TOPO-HCl und TOPO-HNCS. Die für die flüssig-flüssig-Extraktion beschriebene Schlußfolgerungen scheinen auch für die Umkehrphasen-Dünnschicht-Chromatographie zu gelten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00439727
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  • 5
    Electronic Resource
    Electronic Resource
    Styrene-divinylbenzene copolymers. II. The conservation of porosity in styrene-divinylbenzene copolymer matrices and derived ion-exchange resins (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 19 (1975), S. 2647-2654 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The collapse of pores in styrene-divinylbenzene copolymers and corresponding ion-exchange resins was studied during the removal of solvating liquids. The process can be followed in a most simple way by measuring the volume of the bead-shaped copolymers upon drying. Other parameters observed during drying were the apparent density and incidently the internal surface. The collapse of pores is considered to be a result of cohesional forces when solvated polymer chains are approaching each other by loss of solvent. The effect will thus be more pronounced in gel-type networks than in porous ones. In porous networks, the effect will be stronger in smaller pores than in larger ones. It is shown that crosslinks, increasing the rigidity of the structures, will favor the conservation of porosity. In ion-exchange resins the pore stability is best when the material is in its lowest state of hydration. Generally, the collapse of pores is a reversible process. The collapsed material can in most cases be reswollen by the proper choice of solvent.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1975.070191001
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