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  • 1
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 12 (1984), S. 119-126 
    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 The xanthene dye Rose Bengal (disodium salt of 3′, 4′, 5′, 6′-tetrachloro-2, 4, 5, 7-tetraiodofluorescein) has been covalently bound to a linear (soluble) copoly styrene-vinyl benzyl chloride. The chemical union takes place through alkylation of the carboxylate anion of the dye by one of the chloromethyl groups grafted on the polymer. The quantum yield of singlet oxygen generation results equal to that of the free dye and the photostability seems to be improved.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 8 (1982), S. 369-375 
    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 The energy transfer ability of free and polymer-bound acetophenone and benzophenone has been studied. The polymeric sensitizers were prepared by acetylation or benzoylation of atactic polystyrene (¯Mn=67.000). Trans-cis isomerization of stilbene, monitored by UV-spectrophotometry, has enabled the energy transfer process to be probed. The values of the Stern-Volmer constants, determined by following this technique, indicate that the energy transfer efficiency of both ketones is higher when they are in free state than when they are polymer-bound.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 71 (1978), S. 131-141 
    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 kinetische Gleichung für die radikalische Polymerisation von Isopropyl-vinyl-keton in Benzol als Lösungsmittel mit AIBN als Initiator bei 60°C wurde bestimmt. Der Einfluß der Mikrostruktur auf die Photoabbaugeschwindigkeit von ataktischem und kristallinem Poly-isoproyl-vinyl-keton (PIVK) wurde auch untersucht. Die Photolyse von ataktischen und kristallinen Polymeren wurde sowohl in Lösung als auch im Festzustand durchgeführt. Die Bestrahlung verursacht Kettenspaltungen und Kettenverzweigungen oder nur Kettenspaltungen; dieses Verhalten hängt von der Packungsdichte des Polymeren ab. Es wurde festgestellt, daß die Kettenbeweglichkeit eine wichtige Rolle beim Photoabbau von PIVK spielt.
    Notes: The kinetic equation of the radical polymerization of isopropyl vinyl ketone at 60°C using benzene as solvent and AIBN as initiator was determined. The influence of the microstructure on the photodegradation rate of atactic and crystalline poly(isopropyl vinyl ketone) (PIVK) was also investigated. The photolysis of atactic and crystalline samples of PIVK was carried out in solution and in the solid state. By effect of radiation, crosslinking and chain-scission, or only chain-scission, was observed, this behaviour was depending on the aggregation state of the sample. It was proved that the chain mobility plays the main role in the photodegradation of PIVK.
    Additional Material: 6 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 73 (1978), S. 25-33 
    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.
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  • 8
    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.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 62 (1977), S. 85-90 
    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 Reaktivität verschiedener monomerer Vinylketone bei der radikalischen Copolymerisation mit Methylmethacrylat und Vinylacetat wurden auf der Basis der Taft-Gleichung untersucht. Es ergab sich, daß die relative Reaktivität der Vinylketonmonomeren mit zunehmender Elektronegativität der Substituenten der verschiedenen Vinylketone steigt. Polare und sterische Effekte beeinflussen die Reaktivität nicht.
    Notes: The reactivity of some monomer vinyl ketones in the radical copolymerization with methyl methacrylate and vinyl acetate was studied on the basis of the Taft equation. It was concluded that the relative reactivities of the vinyl ketones in radical reactions increase with increasing electron-withdrawing nature of the vinyl ketone substituent. Polar and steric effects do not affect the reactivity.
    Additional Material: 1 Ill.
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  • 10
    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.
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