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  • 1965-1969  (6)
  • 1
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    Marcion: Théologien biblique ou docteur gnostique? (1967)
    Amsterdam : Periodicals Archive Online (PAO)
    Vigiliae Christianae. 21 (1967) 141 
    Details
    ISSN: 0042-6032
    Topics: Theology and Religious Studies
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:6263-1967-021-00-000005
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  • 2
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    Le problème des origines du gnosticisme et l'histoire des religions (1965)
    Leyden : Periodicals Archive Online (PAO)
    Numen. 12:3 (1965:Sept.) 161 
    Details
    ISSN: 0029-5973
    Topics: History , Theology and Religious Studies
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4146-1965-012-03-000001
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  • 3
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    Bulletin. Le colloque international sur les origines du gnosticisme (Messine, avril 1966) (1966)
    Leyden : Periodicals Archive Online (PAO)
    Numen. 13:2 (1966:Aug.) 151 
    Details
    ISSN: 0029-5973
    Topics: History , Theology and Religious Studies
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4146-1966-013-02-000006
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  • 4
    Electronic Resource
    Electronic Resource
    Time dependence of viscosity of dilute polyisobutylene solutions (1969)
    Springer
    Colloid & polymer science 232 (1969), S. 749-752 
    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: Zusammenfassung Scherung mit konstantem Geschwindigkeitsgradienten von Polyisobutylen (PIB)-Lösungen in viskosen Polybuten-Ölen ergibt zeitabhängige Änderungen ihrer Viskositäten. Zwei PIB-Fraktionen (M=8·106 und 3,8·106) wurden in einer Vielzahl von Lösungsmitteln untersucht, die den Viskositätsbereich von 5 bis 0,5·10−2 Poise überdeckten. Das phänomenologische Erscheinungsbild ist ähnlich dem schon beobachteten für Polymethylmethacrylat, Polystyrol und Polyäthylenoxid-Lösungen in Aroclor. Die Ergebnisse wurden hinsichtlich des Polymer-Molekulargewichts und der Konzentration, der Lösungsmittelviskosität und des Gradienten diskutiert. Die untersuchten Systeme sind frei von starken polaren Wechselwirkungen und von Tendenzen in Richtung auf molekulare Aggregation. Zeitabhängige Änderungen der Viskosität sind deshalb auch für wahre molekulardisperse Lösungen beobachtbar.
    Notes: Summary Shearing at constant gradient of polyisobutylene (PIB) solutions in viscous polybutene oils results in time dependent changes of their viscosities. Two PIB fractions (M=8·106 and 3.8·106) have been studied in a variety of solvents, covering the viscosity range from 5 to 0.5·10−2 poise. The overall phenomenon is similar to that already observed for polymethylmethacrylate, polystyrene, and polyethylene oxide solutions in Aroclor. Results have been discussed in terms of polymer molecular weight and concentration, solvent viscosity and gradient. The systems investigated are free from strong polar interactions and tendency toward molecular aggregation; time dependent changes of viscosity are therefore observable also for true molecularly dispersed solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01500649
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  • 5
    Electronic Resource
    Electronic Resource
    Upturn effect in the Non-Newtonian intrinsic viscosity of polymer solutions. II. Polyisobutylene in polybutene oil (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 6 (1968), S. 1011-1020 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: With an increasing gradient, the intrinsic viscosity of a high molecular weight polyisobutylene (M̄n = 7 × 106) in polybutene oil L.100 (ηs = 5 poise) first drops to a minimum and then rises again. The minimum occurs at β = M[η]0ηsG/NkT = 240, which is about ten times the value predicted by the dumbbell model. Such a shift to larger gradient is in good agreement with the more realistic necklace model of macromolecules in a good solvent. The increase of intrinsic viscosity after the minimum is nearly linear with the gradient and continues beyond the value at zero gradient. Experiments with capillaries of different length-to-diameter ratios yield identical flow curves so that one may exclude the possibility that the observed upturn is an artifact caused by end effects or time dependence of viscosity.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.160060519
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  • 6
    Electronic Resource
    Electronic Resource
    Radiation effects on polystyrene in solution (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 385-398 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Four polystyrene samples, with molecular weight ranging from 43,300 to 1,112,000 have been irradiated in benzene solution by γ-rays, at four different intensities. Data obtained through intrinsic viscosity and light-scattering measurements on irradiated polymers indicate that, at each intensity, there exists a molecular weight below which any polymer chain is no further degraded. An equilibrium between absorbed and dissipated energy by the macromolecule is supposed, and the equation, MlimI = const. arrived at in a previous study, is verified also by the present experimental results.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090133
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