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  • 1
    ISSN: 0095-9898
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    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 56 (1962), S. S23 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 23 (1957), S. 241-245 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: It seems that the dielectric properties of high polymer solutions may be partially attributed to an interaction between the macromolecules and the molecules of solvent, if the latter is polar. The study of the variations of the static dielectric constant with the temperature yields interesting data. By applying a model analogous to that proposed by Fröhlich for pure liquids to a dilute solution of a polar macromolecule in a polar solvent, a correlation factor (g) may be defined if the deformation polarization is considered macroscopically through the refractive index of the solutions. This treatment is valid as well in the case of rigid macromolecules as in the case where these chains are decomposed in statistical segments. The example of a 2% solution of polybutylmethacrylate in toluene shows that this effect indeed exists. The study of these properties, which is now going on, will show if a relation exists between the factor g for different solutions of high polymer in different solvents, particularly with respect to an eventual precipitation temperature.
    Notes: Il semble possible d'attribuer partiellement les propriétés diélectriques de solutions de hauts polymères à une interaction entre la macromolécule et les molécules du solvant, si ce dernier est polaire. L'étude de la variation de la constante diélectrique statique avec la température peut alors apporter des renseignements intéressants. Appliquant à la solution diluée d'une macromolécule polaire dans un solvant polaire, un modèle analogue à celui proposé par Fröhlich pour les liquides purs, on peut définir un facteur de corrélation (g) si l'on tient compte de la polarisation de déformation d'une façon macroscopique à travers l'indice de réfraction de la solution. Le raisonnement est valable aussi bien pour le cas où l'on considère la macromolécule comme un tout plus ou moins rigide que pour celui où on la décompose en chaǐnons statistiques. L'exemple d'une solution à 2% de polyméthacrylate de butyle dans le toluène montre que l'effet existe. I'étude de ces propriétés, commencée depuis peu au laboratoire, aura e.a. pour but de voir s'il existe une relation entre le facteur g pour différentes solutions de hauts polymères dans différents solvants, notamment par rapport à une éventuelle température de précipitation.
    Additional Material: 1 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 80 (1964), S. 141-148 
    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 Konformationsumwandlung von teilweise veresterter Polymethacrylsüre wurde mit Hilfe der potentiometrischen Titration untersucht.Es wurde gefunden, daß die Stabilität der bei kleinem Dissoziationsgrad (α) vorliegenden Form nicht vermindert wird, wenn die Zahl jener Kettenglieder, die intramolekulare Wasserstoffbrücken ausbilden können, abnimmt. Es zeigt sich vielmehr, daß die Umwandlung mit der mittleren Ladung pro Struktureinheit zusammenhängt. Dies stützt die Hypothese, wonach die bei kleinen α-Werten stabile Form eine kompaktere Struktur besitzt, die möglicherweise durch VAN DER WAALsche Wechselwirkungen zwischen den  - CH3-Gruppen stabilisiert ist.
    Notes: The conformational transition of poly-(methacrylic acid), partially esterified with dimethyl sulfate, has been studied using potentiometric titration at constant temperature.It is found that the stability of the form existing at low values of dissociation (α) is not decreased by reducing the number of groups on the chain capable of establishing intramolecular hydrogen bonds. The transition is also shown to depend on the average charge per monomeric unit. This confirms the hypothesis that the stable form at low α-values is a compact structure stabilized probably by VAN DER WAALS attractions between  - CH3 groups.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 1879-1891 
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The potentiometric behavior of polymethacrylic acid is discussed in terms of a conformational transition. A thermodynamic treatment of this transition is presented. The titration curve of polymethacrylic acid is analyzed in a detailed way and quantitative information regarding the transition is obtained.
    Additional Material: 5 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 2883-2899 
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The calculation of formation curves of metal-polyacid complexes from titration curves is discussed. The interaction of bivalent ions of Cu, Cd, Zn, Ni, Co, and Mg with poly(methacrylic acid) is investigated by this method. These metals seem to form complexes involving two carboxylate groups for each ion in a large domain of pH values. Formation constants for these complexes are given which decrease according to the order indicated above.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 1 (1963), S. 265-267 
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    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. 3771-3780 
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Cu(II) chelate of polymethacrylic acid was investigated. Viscometric, electrophoretic, and spectrophotometric evidence is shown to confirm the potentiometric results reported previously which indicated the binding of two carboxylic groups by one Cu(II) ion.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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