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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 22 (1957), S. 31-38 
    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: Preparation and properties of polyacrylic hydrazides have been described. Salification and reducing ability correspond to those of low molecular acid hydrazides. Polyacrylic hydrazides form with aldehydes and ketones macromolecular hydrazones and with nitrous acid explosible macromolecular azides.
    Notes: Es werden Darstellung und Eigenschaften von Polyacrylsäurehydraziden beschrieben. Salzbildung und Reaktionsfähigkeit entsprechen denen niedermolekularer Säurehydrazide. Polyacrylsäurehydrazide bilden mit Aldehyden und Ketonen makromolekulare Hydrazone, mit salpetriger Säure explosive, makromolekulare Azide.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 23 (1957), S. 443-450 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It is shown theoretically that phase separation may arise in solutions of polyelectrolytes due to electrostatic interactions alone. Two models are considered thermodynamically. In both models the free energy is represented as the sum of an entropy of mixing term and an electrostatic free energy term, while the van der Waals attractions are neglected. In the one model, electrically charged rigid cylindrical rods are in solution with an equivalent amount of counterions but without additional electrolyte. The free electrical energy, in this case, is given by the expression of Lifson and Katchalsky. In the other model the solution contains two types of macroions of opposite charge. The macroions are flexible coils carrying a number of univalent charges, the charge density being sufficiently low. The electrical free energy in this case may be approximated by the Debye-Hückel expression. For both models, it is shown that the decrease in the electrical free energy in a phase separation can, at given temperature and pressure, more than compensate for the increase in the entropy of mixing term. The effects of polymer concentration, dielectric constant, charge density, and salt content follow directly from the thermodynamic treatment of the models.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 22 (1957), S. 39-46 
    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: Polyacrylic hydrazides form with many aldehydes and ketones macromolecular hydrazones. Preparation and properties of these hydrazones are described.
    Notes: Polyacrylsäurehydrazide bilden mit zahlreichen Aldehyden und Ketonen makromolekulare Hydrazone. Darstellung und Eigenschaften dieser Hydrazone werden beschrieben.
    Additional Material: 4 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 23 (1957), S. 141-151 
    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: Viscosimetric and osmometric measurements on fractionated Vinyon N (copolymer of 40% PAN and 60% PVC) are reported. Dimethylformamide is found to be a better solvent than acetone. The commercial product (unfractionated) has a Mn of 74000, therefore no shear dependent viscosity is found with dilute solutions. Rheological measurements make it probable, that molecular dispersion takes place in solution of 5% concentration. For the viscosity relation the following constants have been found (25°, c in g/100 ml): \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {\left[ \eta \right] = 3,8 \cdot 10^{ - 5} \cdot \overline {\rm M} _{0{\rm sm}}^{0,92} } & {{\rm in dimethylformamide}} \\ {\left[ \eta \right] = 1,0 \cdot 10^{ - 4} \cdot \overline {\rm M} _{0{\rm sm}}^{0,83} } & {{\rm in acetone}} \\ \end{array} $$\end{document}
    Notes: Es werden viskosimetrische und osmometrische Messungen an fraktioniertem Vinyon N (Mischpolymerisat aus 40% PAN und 60% PVC) beschrieben. Es ergibt sich, daß Dimethylformamid ein besseres Lösungsmittel ist als Aceton. Das Handelsprodukt (unfraktioniert) hat ein Mn von 74000, daher tritt bei den verdünnten Lösungen auch keine Strukturviskosität auf. Rheologische Messungen machen wahrscheinlich, daß molekulare Dispersion bei etwa 5% Lösungen einsetzt. Für die Viskositätsbeziehung wurden die Konstanten gefunden (25° C, c in g/100 ml): \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {\left[ \eta \right] = 3,8 \cdot 10^{ - 5} \cdot \overline {\rm M} _{0{\rm sm}}^{0,92} } & {{\rm in Dimethylformamid}} \\ {\left[ \eta \right] = 1,0 \cdot 10^{ - 4} \cdot \overline {\rm M} _{0{\rm sm}}^{0,83} } & {{\rm in Aceton}} \\ \end{array} $$\end{document}
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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