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  • 11
    Electronic Resource
    Electronic Resource
    Über die strahlenchemische Vernetzung von Halogenphenolnovolaken und Halogenphenolnovolak-Bisazidgemischen (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 371-374 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: XPS investigations and determination of the electron beam sensitivity revealed a crosslinking mechanism via halogen elimination. The crosslinking effect is higher with an admixture of bisazide. The halogen elimination induced by irradiation of the 4-halogenphenol novolac resists increases in the order fluorine, chlorine, bromine, iodine.
    Notes: XPS-Untersuchungen und die Bestimmung der Elektronenstrahlempfindlichkeit an Halogenphenolnovolak-Resistschichten ergaben, daß ein Vernetzungsmechanismus über Halogeneliminierung abläuft. Durch Bisazidzusatz wird der Vernetzungseffekt erhöht. Die strahlenchemisch induzierte Halogeneliminierung der untersuchten 4-Halogenphenolnovolake steigt in der Reihenfolge Fluor-Chlor-Brom-Iod.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420807
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  • 12
    Electronic Resource
    Electronic Resource
    Radikalreaktionen in γ-bestrahltem Polymethylmethacrylat (1985)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 162-166 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The reactions of radicals formed by 60Co irradiation in poly(methyl methacrylate) and copolymers of methyl methacrylate and methacrylic acid (70/30) have been investigated. Further radical formation was found to occur with increasing temperature, amounting to 10% of the radical formation by γ-radiolysis. The validity of the model of a wide distribution of reaction rates is discussed.
    Notes: Die Reaktionen der Radikale, die durch 60Co-Strahlung in Polymethylmethacrylat und in Copolymerisaten aus Methylmethacrylat und Methacrylsäure (70/30 Masse-%) erzeugt werden, wurden untersucht. Es wird nachgewiesen, daß durch Temperaturerhöhung weitere Radikale erzeugt werden, die 10% der durch γ-Radiolyse gebildeten Radikalkonzentrationen erreichen. Die Anwendbarkeit des Modells der breiten Verteilung der Reaktionsgeschwindigkeiten wird diskutiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1985.010360310
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  • 13
    Electronic Resource
    Electronic Resource
    EPR-Untersuchungen γ-bestrahlter chlorsubstituierter Poly(methacrylate) (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 114-119 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: γ-radiolysis of poly(methyl methacrylate) (PMMA) and chlorosubstituted poly(methacrylates) gives radicals with comparable nine-line-EPR spectra. The transformations of the molecules were discussed in light of the quantitative differences in the accumulation processes. EPR-spectra at liquid helium temperatures confirm the hypothesis of allyl radical accumulation in PMMA.
    Notes: Die im Poly(methylmethacrylat) (PMMA) und in chlorsubstituierten Poly(methacrylaten) radiolytisch erzeugten Radikale ergeben ähnliche EPR-Neunlinienspektren. Molekülumwandlungen zur Deutung der quantitativ unterschiedlichen Akkumulationsprozesse werden diskutiert. EPR-Spektren bei Heliumtemperaturen bestätigen die Hypothese der Akkumulation von Allylradikalen im PMMA.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010380204
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  • 14
    Electronic Resource
    Electronic Resource
    Über die elektrooptische Modulation von Licht in Polymerfestkörpern (1988)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 39 (1988), S. 292-298 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: For the first time we succeeded in pointing out the quadratic electrooptical effect (Kerr-effect) in polymer solids. The investigated polymers containing nitrophenyl groups have Kerr-constants up to B = 800 ċ 10-7 esE-2 cm-1. These are twice as high as the constant of nitrobenzene. Electrooptical measurements of Kerr-aktive polymers provide a further possibility for the investigation of motion processes in macromolecular solids.
    Notes: Es ist erstmalig gelungen, den quadratischen elektrooptischen Effekt (Kerr-Effekt) in Polymerfestkörpern nachzuweisen. Die untersuchten nitrophenylhaltigen Polymere haben Kerrkonstanten bis zu B = 800 ċ 10-7 esE-2 cm-1. Diese sind damit doppelt so hoch wie die des Nitrobenzens. Die elektrooptischen Messungen an Kerr-aktiven Polymeren eröffnen eine weitere Möglichkeit zur Untersuchung von Bewegungsvorgängen in makromolekularen Festkörpern.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1988.010390606
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  • 15
    Electronic Resource
    Electronic Resource
    High temperature superconducting ceramics from polymer metal precursors (1993)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 44 (1993), S. 148-151 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Herstellung von Polymer-Metall-Precursors, ihr thermoanalytischer Abbau sowie ihre Umwandlung zu hochtemperatursupraleitenden Y-Ba-Cu-O- bzw. Bi-Sr-Ca-Cu-O-Verbindungen werden beschrieben. Die dünnen Precursorfilme wurden mittels Elektronenstrahllithographie strukturiert und danach in die HTS-Phasen überführt.
    Notes: We report on the preparation of polymer metal precursors, their thermoanalytical degradation and their transformation to high temperature superconducting (HTS) Y-Ba-Cu-O or Bi-Sr-Ca-Cu-O compounds. The thin precursor film was patterned by electron beam lithography and subsequently transformed to HTS phases.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1993.010440306
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  • 16
    Electronic Resource
    Electronic Resource
    ESR-untersuchungen an γ-bestrahltem polymethylmethacrylat und an einem copolymerisat mit methacrylsäure (1985)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 268-272 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Based on ESR data the effect of annealing and oxygen on the radical reactions in γ-irradiated copolymers of methacrylic acid methyl ester and methacrylic acid is compared with the effect in poly(methyl methacrylate).
    Notes: Der Einfluß von Temperung und Sauerstoff auf die Radikalreaktionen in γ-bestrahlten Copolymeren aus Methacrylsäuremethylester und Methacrylsäure werden im Vergleich zu denjenigen in Polymethylmethacrylat ausgehend von ESR-Messungen diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1985.010360509
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  • 17
    Electronic Resource
    Electronic Resource
    Gereckte Folien aus Poly(vinylalkohol)-Derivaten mit optimierter Doppelbrechung (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 444-446 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: By esterification of poly(vinyl alcohol) with boric acid the polarizability perpendicular to the direction of stretching is increased. Using partially saponified poly(vinyl acetate) for the esterfication provides the possibility of receiving an optimum reduction in birefringence and at the same time an improvement in the resistance of the foils to climatic conditions. By this method the range of application of poly(vinyl alcohol) derivatives for the production of birefringent foils can be extended.
    Notes: Durch Veresterung von Poly(vinylalkohol) mit Borsäure wird eine Erhöhung der Polarisierbarkeit senkrecht zur Reckrichtung erzielt. Bei Verwendung von partiell verseiftem Poly(vinylacetat) zur Veresterung wird neben einer optimalen Herabsetzung der Doppelbrechung gleichzeiting eine Verbesserung der Klimastabilität der Folien erreicht. Die Einsetzbarkeit von Poly(vinylalkohol)-Derivaten für die Herstellung von doppelbrechenden Folien wird dadurch erweitert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010410806
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