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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 93 (1981), S. 159-173 
    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 Oxydation von neuen durch anionische Copolymerization aus Acrolein hergestellten Vinylacetalpolymeren wird beschrieben. 3,3-Diethoxypropen wurde als Modell verwendet und die Abbauprodukte seiner Oxydation identifiziert. Es wurde festgestellt, daß die Oxidation der Modellsubstanz zu den gleichen Abbauprodukten führt. Die Geschwindigkeit des Sauerstoffverbrauchs wurde bei allen Reaktionen volumetrisch bestimmt.Ein Mechanismus für die Oxidationsreaktion gemäß den isolierten Abbauprodukten wird vorgeschlagen.
    Notes: A study on the oxidation of new vinyl-acetal polymers obtained by anionic copolymerization of acrolein is described. Identification studies were carried out on the oxidation products of 3,3-diethoxy-propene as model compound. The products of the oxidation of the unsaturated acetal polymers were found to be identical to the products from the oxidation of the model compound. Rates of oxygen consumption by the model compound and by the polymers were measured by a volumetric method.A mechanism has been proposed taking into account the products isolated and identified and the nature of the oxidation process.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 142 (1986), S. 123-135 
    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: Es wurden lineare p-dimethylaminobenzoylierte Polystyrole hergestellt. Zwei Wege sind dabei verfolgt worden: Einer durch Bildung von Polystyrollithium und der andere durch Polystyrolamidbildung. Mit dem ersten Weg, Poly-p-iodstyrol → Poly-p-lithiumstyrol und Reaktionen des Polylithiumstyrols mit Methyl-4-N,N-dimethylaminobenzoat, wurde immer ein vernetztes Polymeres erhalten, das Hydroxygruppen, und in einigen Fällen  -  in Gegenwart eines Überschusses von Methyl-4-N,N-dimethylaminobenzoat und niedrigen Temperaturen  -  auch Dimethylaminobenzoylgruppen enthielt. Der zweite Weg, Polystyrolamidbildung und nachfolgende Reaktion dieser linear funktionellen Polystyrole mit POCl3 und Dimethylanilin, führte zu einem linearen p-dimethylaminobenzoylierten Polystyrol.Ausgehend von Cumol unter Anwendung derselben Prozedur wie für Polystyrol beschrieben, wurden N-Phenyl-p-isopropylbenzamid und 4-Isopropyl-4′-N-N-dimethylaminobenzophenon als Modellverbindungen erhalten. Beide Modellverbindungen und die funktionellen Polystyrole wurden mit IR, UV, 1H-NMR und Massenspektroskopie sowie Molekulargewichtsbestimmungen charakterisiert. Aus Polystyrolamid wurden auch Polystyrolester und Polystyrolsäure erhalten.
    Notes: Linear p-dimethylaminobenzoylated polystyrenes have been synthesized. Two routes, one of them by polystyrene lithiation and the other one by polystyrene-amide formation, have been followed. With the first route, poly-p-iodostyrene → poly-p-lithio-styrene and reaction of lithiated polystyrene with methyl-4-N,N-dimethyl-aminobenzoate, a crosslinked polymer was always obtained which contained hydroxylic groups and in some cases, in the presence of an excess of methyl-4-N,N-dimethylaminobenzoate and low temperatures, dimethylaminobenzoyl groups. The second route, polystyrene-amide formation and subsequent reaction of this linear functionalized polystyrene with POCl3 and dimethyl-aniline, yielded a linear p-dimethylaminobenzoylated polystyrene. Starting with cumene and following the same procedure described for the polystyrene, the model compounds N-phenyl-p-isopropylbenzamide and 4-isopropyl-4′-N,N-dimethylaminobenzophenone were also obtained. Both model compounds and functionalized polystyrenes were characterized by IR, UV, 1H-NMR and mass spectroscopy as well as molecular weight determinations. From polystyrene-amide, polystyrene-ester and polystyrene-acid were also obtained.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The initial rate of the polymerization of methyl acrylate photoinitiated by 4-dimethylamino-4′-isopropylbenzophenone (2) varies linearly with monomer concentration and the square-root of light intensity. For small absorbances, the initial polymerization rate, Rp, varies linearly with the square-root of the photoinitiator concentration. For high absorbance values, Rp is independent of the photoinitiator concentration in a well-stirred system and decreases as the photoinitiator concentration increases in an unstirred system. This marked differences between the polymerization kinetics in well-stirred and unstirred systems is discussed. The ratio of the propagation rate constant and the square-root of the termination rate constant, kp/kt1/2, and the quantum yield of photoinitiation were determined and related to the results previously obtained in a study on the photoreactivity of 2.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 4
    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 Reaktion zwischen Acroleindiäthylacetal und Radikalen sowie das Verhalten dieses Acetals bei der radikalischen Copolymerisation mit ungesättigten Monomeren wurde untersucht. Auf Grund der Ergebnisse wird ein Mechanismus vorgechlagen, der die Abstraktion eines H-Atoms von einem dem Sauerstoff benachbarten C-Atom durch ein Radikal beinhaltet. Copolymerisationsversuche des Acetals mit verschiedenen Monomeren waren nur mit Acrylnitril und Maleinsäureanhydrid erfolgreich. Die bemerkenswert einheitliche Zusammensetzung des Acetal-Maleinsäreanhydrid-Copolymeren zeigt, daß die Reaktion über einen Donor-Akzeptor-Komplex verläft.
    Notes: The reaction between acroleindiethylacetal (3.3-diethoxypropene) and free radicals and the behaviour of this acetal in the free radical copolymerization with unsaturated monomers has been investigated. The decomposition of benzoyl peroxide and tert.-butyl peroxide in acroleindiethylacetal has been studied in the liquid phase. On the basis of the obtained products a mechanism is proposed which involves the abstraction of a hydrogen atom by a primary radical from a carbon atom which is adjacent to oxygen. We also tried to copolymerize the acetal with several conventional comonomers but copolymers were only obtained when acrylonitrile and maleic anhydride were used. The remarkably uniform composition of the copolymers from the acetal and maleic anhydride is explained through a donor-acceptor complex between the two monomers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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