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  • Chemistry  (3)
  • Physics  (1)
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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Diffusion and Viscosity of Low Polymers in Solution (1960)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 41 (1960), S. 31-39 
    Details
    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: Die Viskositätszahl [η] und der Diffusionskoeffizient D wird als Funktion des Molekulargewichts an Polystyrol-Fraktionen im Molekulargewichtsbereich von 600 bis 50 000 untersucht.Die Ergebnisse zeigen, daß für die niedermolekularen Polymeren, unabhängig von der Natur des Lösungsmittels, d.h. für ein gutes oder ein Θ-Lösungsmittel, die zwei Gleichungen: \documentclass{article}\pagestyle{empty}\begin{document}$\begin{array}{*{20}c}{{\rm D} = {\rm K} \cdot {\rm M}^{ - 0.5} } & [ \\ \end{array} {\rm \eta }] = {\rm K}' \cdot {\rm M}^{0.5} $\end{document} gültig sind.Über die Dimensionen der untersuchten Fraktionen werden einige Betrachtungen angestellt.
    Notes: The behaviour of the limiting viscosity number [η] and diffusion coefficient D is studied as function of molecular weight, for some polystyrene fractions with molecular weight ranging from 600 to 50,000.The experimental results show that the two equations: \documentclass{article}\pagestyle{empty}\begin{document}$\begin{array}{*{20}c}{{\rm D} = {\rm K} \cdot {\rm M}^{ - 0.5} } & [ \\ \end{array} {\rm \eta }] = {\rm K}' \cdot {\rm M}^{0.5} $\end{document} hold for low polymers irrespective of solvent nature, i.e. good and Θ-solvent.Some considerations are made about the dimensions of the studied fractions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1960.020410104
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Diffusion and viscosity measurements on macromolecules in solution (1958)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 30 (1958), S. 175-186 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In a previous paper we gave evidence for the validity of the Einstein-Stokes law for determining molecular dimensions from the diffusion coefficient. In this work, we report on measurements on some polyoxyethylenes in water and on low molecular weight polystyrenes in benzene. The possibility of obtaining exact information regarding the molecular dimensions and the interactions with the solvent have been stated. In high polymers, the dimensions are considerably influenced by the molecular expansion coefficient, α; as a result of this, in studying structural properties of the molecules in solution, the measurements must be carried out in ideal solvents. We have developed a method based on viscometric measurements, which makes possible determination of the composition of the ideal mixture for a given temperature, where such a mixture consists of two components, of which one is a good solvent, and the other is a precipitating agent (non-solvent). Such measurements have been made on 11 fractions of polystyrene from which it has been possible to determine the expansion coefficient α and the dimensions of the unperturbed molecules at 34°C.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1958.1203012115
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