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  • Polymer and Materials Science  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    The excluded volume of branched chainsThis research was supported in part by the Office of Naval Research under Contract N6onr26319. (1954)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 12 (1954), S. 123-132 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A theory of the excluded volume of branched molecules has been developed. The model of the branched molecule is a main or backbone string of beads from which side branches (which are themselves unbranched) originate. Each of these beads has the property of the Kuhn statistical chain element. The calculation is based on the Fokker-Planck equation as used by Hermans and collaborators. The differential equation obtained therefrom is not solved, but the average squared distance between two segments on the main chain is obtained. It is found that this quantity \documentclass{article}\pagestyle{empty}\begin{document}$ 〈 r_{t_p }^2 〉 _{Av} $\end{document} contains a term proportional to (t - p)3/2 power, which term arises from the contribution of the branches. The radius of the molecule, which can be measured by light scattering techniques, contains a term proportional to the molecular weight to the three halves power if the length of the branches does not depend on molecular weight. It is suggested that the dependence on molecular weight of the relation between molecular size and branching could be used as an experimental check of the theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1954.120120110
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Polyethylene crystallinity from x-ray studies (1960)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 45 (1960), S. 91-104 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: An x-ray determination of crystallinity of polyethylene has been carried out. The emphasis in this investigation has been on setting up an experimental procedure which is both theoretically sound and experimentally feasible. It has been shown that the per cent crystallinity is best determined by determining the percentage of amorphous material and subtracting this from one hundred. The importance of monochromatization has been discussed, as well as the need for various corrections arising from incoherent scattering, absorption of x-rays, and sample expansion. A few numerical results are reported.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1960.1204514508
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Notes on the statistics of polymer chains (1953)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 10 (1953), S. 559-576 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The configurations of flexible macromolecules are discussed with particular emphasis on some problems arising in the theory of the volume effect. The main points considered are: (1) the relationship between the Kuhn statistical chain element and the carbon bond length; (2) the assumption that a polymer chain is equivalent to a collection of independent beads normally distributed with respect to the center of gravity (“Gaussian gas” model); (3) the distribution of segments of a polymer chain with respect to the center of gravity; (4) the theory of the execluded volume for plane models of a polymer molecule; (5) the relationship between the excluded volume and the local density of polymer segments; (6) the influence of the solvent on the excluded volume; (7) polymer configurations and viscosity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1953.120100607
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    Paper (German National Licenses)
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