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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 115 (1993), S. 3850-3851 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 1 (1979), S. 691-695 
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In a second example of the functionalization of soluble polymers the conversion of the hydroxyl groups of poly (oxyethylene) into carboxyl groups is reported. As protected carboxyl component, 4-toluenesulfonyl lactic acid ethyl ester was synthesized and was allowed to react with sodium salt of poly(oxyethylene). Polymer-analogous hydrolysis of the di(lactic acid ethyl ester) poly(oxyethylene) yielded the carboxyl derivative of poly (oxyethylene).
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 342 (1989), S. 849-849 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Wahlstrom1 recognizes the ecological and health problems caused by a great number of existing chemicals and suggests a phasing-out procedure for a 'sunset' list West German activities in this area may be relevant. In 1982, an Advisory Committee on Existing Chemicals of Environmental ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 83 (1996), S. 498-513 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 83 (1996), S. 498-513 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 1 (1979), S. 427-431 
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In a first example of the functionalization of soluble polymers the conversion of the hydroxyl groups of poly(oxyethylene) into primary amino groups has been studied. Starting from poly(oxyethylene), the preparation of the diphthalimido derivative via the disodium salt is described. Prom this regiospecific functionalized polymer the di(aminoethyl) poly(oxyethylene), which exhibits excellent solubility properties, can be obtained by polymeranalogous hydrazinolysis.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 3 (1980), S. 347-352 
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Two methods for the synthesis of bifunctional carboxy polymers are described. In a first example, poly (oxyethylene) was reacted with a bromoalkyl ester via the sodium salt to yield di (carboxyalkyl) poly (oxyethylene) after hydrolysis. As second method, an one-step procedure is reported in which polyglycols were converted to dicarboxy polymers by polymer-analogous reaction with anhydrides of dicarboxylic acids. Several examples of various chain extending molecules with latent carboxyl functionality for the synthesis of carboxy-telechelic polymers are summarized.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Advanced Materials 9 (1997), S. 513-518 
    ISSN: 0935-9648
    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
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 215 (1994), S. 175-188 
    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 Entfernung und Trennung einer Reihe von Metallionen mit Hilfe des wasserläoslichen Cetylpyridiniumchlorid-modifizierten Poly(ethylenimin)s (PEI-CPC) wurden in Kombination mit der Membranfiltration untersucht. Die Liquid-Phase Polymer-Based Retention(LPR)-Methode wurde zur Abtrennung von niedermolekularen Spezies beiverschiedenen pH-Werten und bei mehreren Elementkonzentrationen herangezogen. Die Studie umfaßt wäassrige Läosungen der Anionen Chromat und Phosphat sowie der Kationen Cu(II), Zn(II), Co(II), Ni(II), Cr(III), Fe(III), Cd(II), Pb(II) und Sr(II). Die Ergebnisse zeigen, daß eine hohe Retention für beide Anionen und auch für die meisten untersuchten Metallionen erzielt wurde. PEI-CPC zeigte gute Abtrenneigenschaften für Chromat-und Phosphationen selbst bei relativ hohen Anionenkonzentrationen 85 bzw. 150 mg · L-1und ebenso fäu die meisten untersuchten Metallionen. Im Falle der Cu(II)-, Ni(II)-und Sr(II)-Lonen wurde eine selektive Interaktion beobachtet. Das Polymerreagenz und seine Interaktionsprodukte wurden durch IR- und UV/Vis-Spektrometrie sowie Viskosimetrie charakterisiert. Zusäatzlich wurde das Interaktionsverhalten durch die Retentionsfäahigkeit untersucht. Eine gute Korrelation wurde zwischen den Retentionsdaten und den IR-und UV/VIS-Spektren der Interaktionsprodukte des Polymerreagenzes mit den Metallionen gefunden.
    Notes: The removal and separation of a series of ions by the water-soluble cetylpyridinium chloride-modified poly(ethyleneimine) (PEI-CPC) in conjunction with membrane filtration were investigated. The Liquid-Phase Polymer-Based Retention (LPR) method was applied to study the removal of the low-molecular species at different pH values and at several element concentrations. The study comprises aqueous solutions of the anions chromate and phosphate, and of the cations Cu(II), Zn(II), Co(II), Ni(II), Cr(III), Fe(III), Cd(II), Pb(II) and Sr(II). The results show that a high retention was attained in neutral solutions for both anions and also for most metal ions investigated. PEI-CPC exhibited good removing abilities for chromate and phosphate ions even at relatively high concentrations of anions (85 and 150 mg · L -1, respectively) and also for most of the metal ions studied. In the case of Cu(II), Ni(II), Cd(II), and Sr(II) ions, selective interactions were observed. The polymer reagent and its interaction products were characterized by IR, UV/VIS spectrometry, and viscometry. In addition, the interaction behaviour was investigated by the retention ability. A good correlation was found between the retention data and the IR and UV/VIS spectra of the interaction products of the polymer reagent with the metal ions.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 10
    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: Macromolecular chelating agents have been synthesized and investigated for the complexation with various metals in homogeneous phasing using membrane filtration. Quite a number of water-soluble basis polymers such as poly(vinylamine), poly(acrylic acid), poly(ethyleneimine), and copolymers, and their derivatives are listed and discussed in respect to their application for the chelation of transition metals.The polymers had molecular masses between 20000 and 200000 daltons. The application of membrane filtration rendered it possible to separate excess metallic ions from the polymer chelate in a continuous or discontinuous process. Studies on the metal-binding capacity of the polymer ligand exhibited the possiblity of preparation of macromolecular chelating agents which are selective for different metals. There after, the introduction of chelating groups such as iminodiacetic acid, thiourea, pyridine-2-aldimine, and others, improved significantly the selectivity for the metals copper, nickel, palladium, mercury, iron, gold, and platinum.For the regeneration of the polymer ligands electrolysis and protolysis can be used. The macromolecular chelates remained water-soluble independent of the chelated metal and the polymeric chelating agent. According to these studies, certain metals can be removed selectively from waste water or other diluted solutions in homogeneous phase by the application of polymeric chelating agents.
    Notes: Makromolekulare Chelatogene wurden zur Komplexierung mit verschiedenen Metallen in homogener Phase unter Anwendung der Membranfiltration synthetisiert und untersucht. Eine Anzahl von wasserlöslichen Basispolymeren, wie z. B. Poly(vinylamin), Poly(acrylsäure), Poly(ethylenimin), ihre Copolymere und Derivate wurden im Hinblick auf ihre Anwendung zur Komplexbildung von Übergangsmetallen dargestellt und untersucht.Die Molmassen der Polymere lagen zwischen 20000 und 200000 Daltons. Die Anwendung der Membranfiltration ermöglicht die Abtrennung von überschüssigen Metallionen vom Polymerkomplex in einem kontinuierlichen oder diskontinuierlichen Verfahren. Studien über die Metallbindungskapazitäten der Polymerliganden zeigten, daß es möglich ist, makromolekulare Chelatogene darzustellen, die für verschiedene Metalle selektiv sind. Danach verbesserte die Einführung von chelatogenen Gruppen, wie Iminodiessigsäure, Thioharnstoff, Pyridin-2-aldimin und andere, signifikant die Selektivität für die Metalle Kupfer, Nickel, Palladium, Quecksilber, Eisen, Gold und Platin.Zur Regenerierung der Polymerliganden kann die Elektrolyse oder Protolyse verwendet werden. Die makromolekularen Komplexe blieben unabhängig vom komplexierten Metall und des polymeren Chelatogens wasserlöslich. Nach diesen Studien können bestimmte Metalle selektiv aus Abwasser oder anderen verdünnten Lösungen durch die Anwendung von polymeren Chelatogenen in homogener Phase entfernt werden.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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