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  • 1960-1964  (9)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 83 (1961), S. 3789-3795 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 66 (1962), S. 823-828 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 66 (1962), S. 2101-2107 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 11 (1960), S. 187-272 
    ISSN: 0066-426X
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 46 (1960), S. 3-17 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A viscometric polydispersity index may be calculated by forming the ratio of the viscosity-average molecular weights of a polymer in a relatively good solvent and in a relatively poor solvent and subtracting 1. This index has been examined by measuring dilute solution viscosities of a polydisperse polystyrene and a polydisperse methyl methacrylate in a variety of solvents, calculating viscosity-average molecular weights using Mark-Staudinger-Houwink equations, and forming the viscometric polydispersity indices. These are compared to Schulz parameters, weight-average-number-average molecular weight ratios minus 1, determined from osmotic pressure and light scattering. Viscometric polydispersity indices are more sensitive to polydispersities than expected when compared to Schulz parameters if account is taken of the differences in the powers of molecular weight in the various molecular weight sums. Viscometric polydispersity indices are examined for other polymers, including an almost monodisperse polystyrene. From these measurements it is concluded that the viscometric polydispersity index is valuable for characterizing the polydispersity of polydisperse linear polymers and rough fractions. The weight-average-viscosity-average polydispersity index is more sensitive than the viscometric polydispersity index and may be used to characterize relatively monodisperse linear polymers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 73 (1964), S. 188-202 
    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 Durchlässigkeit von Folien aus vulkanisiertem Kautschuk, Polyäthylen und Polypropylen für verschiedene Gase und Dämpfe wurde als Funktion der Filmdehnung gemessen. Beim Kautschuk traten keine änderungen auf. Polyäthylen und Polypropylen dagegen zeigten eine erhöhte Durchlässigkeit mit wachsender Dehnung. Beim Polyäthylen wurde bald völlige Sättigung erreicht.Die Ergebnisse konnten durch die beim Dehnen erfolgte Zunahme des freien Volumens, die ihrerseits eine Erhöhung der Diffusion bedingt, quantitativ gedeutet werden. Ferner wurde die Theorie des Dehnungseinflusses auf die Löslichkeit von Gasen und Dämpfen in vernetzten Polymeren entwickelt. Bei geringer Vernetzung und Dehnung waren nur sehr kleine Effekte zu erwarten.
    Notes: The permeabilities of vulcanized rubber, polyethylene and polypropylene to various gases and vapors have been determined as a function of strain. No changes in the permeability constants were found in the case of rubber. Both polyethylene and polypropylene showed increasing permeability constants with increasing strain but with polyethylene there was a levelling off above a certain level of strain. The results are interpreted in terms of increases in the free volume with straining leading to increases in the diffusivities. A theoretical treatment of the effect of strain on the solubilities of penetrants in crosslinked polymers is presented and shown to lead to only small effects with moderate degrees of crosslinking and straining.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 2011-2011 
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 1115-1119 
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We point out explicitly the dependence of the non-Fickian diffusive flows of low molecular weight penetrants through a polymer membrane possessing a gradient in internal composition or a local property, such as a stress, on the gradient of the chemical potential of the polymeric substance. The possibility of maintaining for sufficiently long times a gradient in internal composition or property in these substances is a consequence of the long relaxation times encountered in these substances. A number of ways are suggested for preparing such membranes. Certain consequences for the diffusive separation of penetrants by such membranes are noted.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 1 (1963), S. 581-586 
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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