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  • 1
    ISSN: 1608-3148
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Non-steady-state radiation-induced conductivity of poly(methyl methacrylate) was studied at room and elevated temperatures. It was shown that the conductivity is due to electric polarization of geminate pairs. The evolution of geminate pairs was rationalized in terms of the Rose–Fowler–Weisberg generalized model. The conclusions by the model were compared with the results of previous studies on the kinetics of formation and decay of geminate pairs upon pulse radiolysis or flash photolysis of doped poly(methyl methacrylate).
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 52-56 
    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 transiente strahlungsinduzierte Leitfähigkeit von Polystyren nach Elektronenbestrahlung mit Einzelimpulsen (65 ke V; 0,3 ms) wurde gemessen. Die Aktivierungsenergie der verzögerten Komponente beträgt 0,17 eV. Die Dotierung des Polymers mit Rhodamin-6G und Tetracyanethylen ist mit der Annahme verträglich, daß Polystyren Defekt-elektronen-Leitung besitzt. Bei den angewandten Feldstärken unter 108 V/m treten praktisch keine Transitzeiteffekte in 20 μm dicken Polymerfilmen auf. Die Anwendung der vorgeschlagenen Theorie der transienten Hopping-Leitung und ihre Beziehungen zum konventionellen Bändermodell der licht- und strahlungsinduzierten Leitfähigkeit amorpher Halbleiter werden diskutiert.
    Notes: Transient radiation-induced conductivity of polystyrene resulting from single pulses (0.3 ms) of 65 keV electrons in vacuum has been investigated. The activation energy of the delayed component was found to be 0.17 eV. Doping of polystyrene with additives (rhodamine-6G, tetracyanoethylene) is consistent with the fact that this polymer is hole conducting. Transit time effects in polymer films of 20 μm thickness are practically absent at fields less then 108 V/m. The application of the proposed theory of the transient hopping conduction and its relationship to the conventional band model of photo- and radiation-induced conductivity in amorphous semiconductors is also discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 336-342 
    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 strahlungsinduzierte Leitfähigkeit von mehr als 30 Polymeren nach Anregung durch einen Elektronenimpuls (40 ns, 8 MeV) wurde im Nanosekundenbereich untersucht. Die Bestrahlung erfolgte im Vakuum bei Zimmertemperatur. An einigen Polymeren wurden auch vergleichende Untersuchungen im Mikrosekundenbereich durchgeführt. Die Analyse der Meßwerte erfolgt auf Basis des Konzepts der durch die erzeugten Ladungsträgerpaare kontrollierten Leitfähigkeit. Es wird gezeigt, daß unter Zugrundelegung des Modells eines dispersiven Ladungstransports wertvolle Informationen über die effektive Anfangsbeweglichkeit und zum Frequenzfaktor unmittelbar aus dem Experiment erhalten werden können.
    Notes: Nanosecond time-resolved RIC in some 30 polymers excited by a 40 ns, 8 Me V electron pulse has been studied. Irradiation was carried out in vacuum at room temperature. For some polymers comparative investigations in the microsecond time region are also reported. Data analysis is based on the concept of geminate electrons controlling pulsed conductivity. It is shown that the application of the dispersive transport formalism allows to gain valuable information concerning the initial effective mobility and the frequency factor directly from the experiment.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 247-250 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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