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  • Chemistry  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 164 (1973), S. 283-294 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In Lösung und in Emulsion bei 50°C hergestellte Copolymere aus Methylacrylat (A) und Methacrylnitril (M) wurden durch 220-MHz-NMR-Spektren charakterisiert. Die Methin- und die α-Methyl-Protonen-Resonanzen für solche Copolymere bestehen aus drei Signalen, wobei die individuellen Peakflächen Protonen in der Mitte von verschiedenen A-oder M-zentrierten Triaden zugeordnet werden. Die Triadenanteile, die aus den Methin-und den α-Methyl-Resonanzen ermittelt wurden, stimmen ausgezeichnet mit den mit Hilfe der Copolymerisationsparameter rA = 0,39 ± 0,06 und rM = 3,56 ± 0,50 für die in Emulsion und rA = 0,24 ± 0,02 und rM = 3,21 ± 0,11 für die in Lösung polymerisierten Copolymeren berechneten Werten überein.
    Notes: Methyl acrylate (A)/methacrylonitrile (M) copolymers, prepared by emulsion and solution polymerization at 50°C, were characterized by 220 MHz NMR spectroscopy. The methine and α-methyl proton resonances of such copolymers consisted of three peak patterns, individual resonance areas being assignable to protons centered in various A or M centered triads. Triad fractions determined from methine and α-methyl resonance patterns were in excellent agreement with calculated values based on reactivity ratios of rA = 0.39 ± 0.06 and rM = 3.56 ± 0.50 for copolymers prepared in emulsion and on reactivity ratios of rA = 0.24 ± 0.02 and rM = 3.21 ± 0.11 for copolymers prepared in solution.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Steady state fluorescence measurements in dilute solution have been performed for eight halogenated polystyrenes and for poly(2,5-dimethylstyrene). The monomers for halogenated polymers are o-X-styrene (X = F, Cl, Br), m-fluorostyrene, p-X-styrene, and p-chloro-α-methylstyrene. The position of the excimer band and the ratio of the intensities of the excimer and monomer fluorescence depend on the substitution. The results for poly(p-chloro-α-methylstyrene) and poly(2,5-dimethylstyrene) can be rationalized by a conformational analysis that examines the preferred geometries for face-to-face complexes by rings bonded to chain atoms i and i + 2. The results for the other polymers cannot be explained by a conformational analysis. They appear to arise from a combination of factors that alter the electronic properties of the chromophore.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 77 (1965), S. 405-413 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zur Untersuchung der Sequenzverteilung in Copolymeren stehen mehrere Verfahren zur Verfügung, aber keines von ihnen kann in allen Fällen routinemäßig angewendet werden. Die Einführung der „Blockzahl“ (run number) erlaubt eine einfache Behandlung der Ergebnisse solcher Studien. Alle bisher erhaltenen Resultate sind mit der klassischen Theorie der Copolymerisation in Einklang zu bringen.
    Additional Material: 2 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 9 (1971), S. 911-914 
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 77 (1965), S. 1124-1134 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die physikalischen Eigenschaften von Copolymeren sind durch ihre Zusammensetzungen und durch die Verteilung der Monomersequenzen bestimmt. In einigen Fällen kann die Sequenzverteilung aus den physikalischen Eigenschaften des Copolymeren abgeleitet werden. Dies ist relativ einfach, wenn die Berechnungen auf „Blockzahlen“ (run numbers) basieren.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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