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  • 1
    Electronic Resource
    Electronic Resource
    Iterative evaluation of thermally stimulated depolarization current peak parameters in polymers: A dipolar interaction approach to molecular dipole relaxation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 5079-5083 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An approach for the dipole relaxation in polymers is treated considering the dipole–dipole interaction between the molecules. The thermally stimulated depolarization peak parameters, i.e., the activation energy E, the pre-exponential factor τ0, and the dipole interaction strength parameter q, were evaluated using the iterative technique. Good results are obtained in comparison with other methods. A linear relationship between the activation energy and the logarithm of the pre-exponential factor of the relaxation times is existing confirming the operation of the compensation law. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359738
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  • 2
    Electronic Resource
    Electronic Resource
    Search for anomalous electric dipole transitions in ^1^8^7Re
    Amsterdam : Elsevier
    Physica 31 (1965), S. 1125-1132 
    Details
    ISSN: 0031-8914
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-8914(65)90157-6
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  • 3
    Electronic Resource
    Electronic Resource
    Dielectric and relaxation behaviour studies in acrylonitrile-methylacrylate copolymer (1991)
    Springer
    Journal of materials science 2 (1991), S. 146-148 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Poly(acrylonitrile-methylacrylate) copolymer is a semicrystalline material, as defined by X-ray diffraction, and is thermally stable up to 425 K as revealed by infrared investigations. The study of dielectric properties obtained from this copolymer allows us to follow the relaxation processes and showed the difference between three processes; β-, α- and ρ-relaxations. The first two processes occur in the two phases, amorphous and crystalline, and the third process is associated with the glass transition temperature. The origins of these processes were attributed to local motion of the polymer backbone segments, to a dipole orientation of the chain side groups and to an ionic space-charge relaxation, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696289
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  • 4
    Electronic Resource
    Electronic Resource
    The 371 keV 2^+-2^+ transition in ^1^9^0Os investigated by electron-electron and gamma-electron directional correlations
    Amsterdam : Elsevier
    Nuclear Physics, Section A 135 (1969), S. 657-677 
    Details
    ISSN: 0375-9474
    Keywords: RADIOACTIVITY
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(69)90011-6
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  • 5
    Electronic Resource
    Electronic Resource
    Internal conversion studies of double decay processes in ^1^1^4In
    Amsterdam : Elsevier
    Physics Letters B 29 (1969), S. 576-578 
    Details
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0370-2693(69)90301-3
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  • 6
    Electronic Resource
    Electronic Resource
    TSDC spectra in negatively corona charged ABS electrets (1990)
    Springer
    Polymer bulletin 23 (1990), S. 61-66 
    Details
    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 Corona charging technique has been used during polymer electret formation. Investigations of the thermally stimulated depolarization current (TSDC) in the electrets formed from Acrylonitrile-Butadiene-Styrene (ABS) terpolymer films were carried out. The optimum conditions for negatively corona-charged ABS films were determined. With the aid of partial heating technique, a single peak was obtained at T=381±2 K. This peak is associated with the temperature which was attributed to the motion of the bulk detrapping electrons arising from the thermal agitation as well as from erosion of the traps by the molecular motion. The activation energy of the process has been calculated. The electret property can be described in terms of dipolar relaxation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983965
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  • 7
    Electronic Resource
    Electronic Resource
    Experimental evidence for anomalous L/M conversion ratio of the 2+→0+ transitions in some deformed even-even nuclei (1966)
    Springer
    The European physical journal 195 (1966), S. 435-443 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TheL-subshell andM conversion coefficients ratios of the 2+→0+ transitions in some deformed even-even nuclei have been determined using a high resolution iron free double focusing beta-ray spectrometer. All possible uncertainties in these measurements have been minimized and properly evaluated. TheL 1+L 11/L 111 ratios for the 2+→0+ E2 transitions in Dy160, Er166, Yb170, Hd176 and W182 are found to be in agreement with the theoretical ones within an experimental error of about 4%. However, large deviations from the theory of about two order of magnitude are observed forL/M conversion ratios. The deviations indicate the possibility of considerable approximation in the theoretical calculation of theM-internal conversion coefficients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01385488
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  • 8
    Electronic Resource
    Electronic Resource
    Kationische Polymerisation organischer Substanzen in hohen elektrischen Feldern (1971)
    Springer
    Colloid & polymer science 246 (1971), S. 679-681 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary Polymerization of organic molecules can be induced by high electric fields (several 107 V/cm). The primary step of this “field polymerization” process consists of field ionization of a molecule near to the field producing anode surface. The result of field polymerization is the growth of organic, semiconducting micro needles on the field anode. The mechanism of field polymerization of benzonitrile and crotonaldehyde is studied by means of a field ionization mass spectrometer. Conclusions on the mechanisms of polymerization can be drawn from the mass spectra. In the case of benzonitrile and crotonaldehyde the data indicate a cationic mechanism of polymerization.
    Notes: Zusammenfassung Eine Polymerisation organischer Moleküle kann durch hohe elektrische Felder (einige 107 V/cm) induziert werden. Der Primärschnitt dieser „Feldpolymerisation“ ist die Feldionisation eines Moleküls in der Nähe der felderzeugenden Anodenoberfläche. Das Ergebnis der Feldpolymerisation ist das Wachstum von organischen, halbleitenden Mikronadeln auf der Feldanode. Der Mechanismus der Feldpolymerisation von Benzonitril und Crotonaldehyd wurde mit einem Feldionisations-Massenspektrometer studiert. Aus den Massenspektren können Schlüsse bezüglich der Polymerisationsmechanismen gezogen werden. Die Messungen deuten im Falle des Benzonitrils und des Crotonaldehyds auf einen kationischen Polymerisations-mechanismus hin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01501301
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  • 9
    Electronic Resource
    Electronic Resource
    Compensation effect in styrene-acrylonitrile copolymer and acrylonitrile-butadiene-styrene terpolymer as explored by thermally stimulated depolarization measurements (1990)
    Springer
    Journal of materials science 25 (1990), S. 2795-2799 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Thermally stimulated depolarization currents of styrene-acrylonitrile and acrylonitrile-butadiene-styrene copolymers have been investigated in the high-temperature range. A peak associated with the glass transition temperature was observed which has the characteristic of a dipolar relaxation process. Parameters such as activation energy and relaxation time associated with the dipolar relaxation process have been calculated. The compensation effect is observed to be valid and the value of the compensation temperature differs slightly from one compound to other. The linear relationship between the activation energy and the logarithm of the preexponential factor of the relaxation time is discussed in terms of the compensation temperature and the chain environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00584882
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  • 10
    Electronic Resource
    Electronic Resource
    Electrical conduction of poly(vinyl alcohol) films (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 2631-2642 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: PVA films (30-45 μm thickness) were prepared by casting. dc electrical measurements were done over the temperature range 293-353 K. Two different conduction mechanisms are suggested. The first one is ohmic and extends to 303 K. Above this temperature a space-charge-limited conduction mechanism, with protons as charge carriers, predominates. Dependences of the voltage-reversion current temperature and field were investigated and were attributed to a clean-up effect of charge carriers. The variance in the activation energy, calculated from the conductivity curves and from the mobility curves, led to a discussion of the origin of the charge carriers. No change in conductivity was observed for the PVA films irradiated with UV (of wavelength 365 nm) at 303 K, i.e., PVA is a photostable material under these conditions.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.090241203
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