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  • 1
    Electronic Resource
    Electronic Resource
    Investigation of Local Motions in Polymers by the Method of Molecular Dynamics (1980)
    s.l. : American Chemical Society
    Macromolecules 13 (1980), S. 602-608 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma60075a023
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  • 2
    Electronic Resource
    Electronic Resource
    Study of the structure of polymers by infrared spectra (1964)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 8 (1964), S. 2923-2933 
    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: In this review a short outline of the results of the application of IR-spectroscopy to the study of polymer physics is summarized. Questions of rotational isomerism, mechanical deformation of polymers, crystallization, intramolecular order, and microtacticity determination are discussed. Details are given on the authors' data concerning polypropylene, 1,4-trans-polybutadiene, poly(methyl methacrylate), and cellulose triacetate, and also data on calculations of spectra for different conformations of poly(vinyl chloride), poly(vinyl bromide), and poly(ethylene terephthalate).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1964.070080635
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of cooperative kinetics on reactions of functional groups on polymer chains (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 9 (1971), S. 769-777 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The kinetics of aminolysis of 1,2;3,4-meso-erythritol dicarbonate and 1,2;3,4;5,6-mannitol, sorbitol, and dulcitol tricarbonates by n-butylamine in dimethylformamide solution was investigated. The dicarbonate and tricarbonates are considered respectively as models of dyads and triads in the poly(vinylene carbonate) chain. The theoretical kinetic curves for the dimer and the trimers were calculated by solution of kinetic equations and close agreement with experiment was obtained. A version of the Monte-Carlo method was developed to provide a model for the reaction process by a computer calculation including the neighboring group effect in enhancing reactivity. The theoretical curve for a trimer coincides with the experimental one. These results confirm the accelerating influence of the unreacted neighboring groups. For the polymeric chain the experimental and calculated curves deviate for conversions beyond 10%. This indicates an additional polymer effect, which is as yet unexplained.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.160090501
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  • 4
    Electronic Resource
    Electronic Resource
    Microtacticity of polymers and methods of its investigation (1961)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 52 (1961), S. 77-83 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The microtacticity (degree of stereoregularity) of vinylic polymers with asymmetric side groups is determined by the competition between the stereospecific influence of the catalyst (if the polymerization is of a catalytic nature) and of the end of the growing chain. The stereospecific influence of the latter is due to the differences in the transition state energies corresponding to isotactic and syndiotactic addition. These differences are associated with van der Waals repulsion of the bulky side chains, determining also chain flexibility. The concept developed by the authors of the effect of chain flexibility on the physical properties of a polymer shows that an important part is played by the interaction not only between neighboring side groups but also between the nearest nonneighboring groups. This leads to dependence of the probability of isotactic or syndiotactic addition of the monomer on the manner of addition of the previous monomer, explaining the formation of stereoblock polymers the chains of which consist of alternate iso- and syndiotactic arrangements. A quantitative method of studying the effect of polymerization conditions on the microtactic state of the polymers should be based on physical properties depending directly on the probability of iso- and syndiotactic addition rather than on the stereoregularity of large regions (such as degree of crystallinity). A theory of the geometrical, electrical, and optical properties of macromolecules has been developed, predicting the relation between these properties and the microtactic state of the chain. The theory recently received experimental verification as to the sizes (Krigbaum, Carpenter, and Newman), dipole moments (Krigbaum and Roig) and optical anisotropy (Tsvetkov and Magarik) of isotactic and atactic polystyrene molecules. A method of investigating the microtacticity on the basis of determination of infrared dichroism in stereoisomeric polymers has also been proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1961.1205215712
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  • 5
    Electronic Resource
    Electronic Resource
    Some specific features of the Valeur, Jarry, Geny and Monnerie (VJGM) lattice model (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 145-147 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Auf der Grundlage des tetrahedralen Gittermodells der Polymerkette wurde eine exakte Lösung der Korrelationsfunktion G(t) erhalten, die die Abhängigkeit der polarisierten Lumineszenz und des Nuklear-Overhauser-Effektes in Polymeren beschreibt. Die exakten Lösungen und die mit dem VJGM-Modell erhaltenen Näherungslösungen wurden miteinander verglichen.
    Notes: In the framework of the tetrahedral lattice model of the polymer chain, a precise solution was obtained for the correlation function G(t) describing the relationships of polarized luminescence (PL) and the nuclear Overhauser effect (NOE) in polymers. The relationships of PL and NOE were compared on the base of precise and approximate (VJGM model) solutions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010410301
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  • 6
    Electronic Resource
    Electronic Resource
    The dynamic behaviour of longitudinal and transverse components of the emitting oscillator and the internuclear vector manifested in polarized luminescence and in the nuclear overhauser effect (1992)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 43 (1992), S. 135-139 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Im Rahmen des tetrahedralen Gittermodells mit einem kinetischen Element aus drei Einheiten wurden die Zeit-Korrelations-Funktionen ermittelt. Diese Funktionen beschreiben die Dynamik der “longitudinalen” und “transversalen” Komponenten des emittierenden Oszillatorvektors einer in die Seitengruppe eingebauten lumineszierenden Markierung sowie die Dynamik des Zwischenkernvektors13C-1H. Es wurden Beziehungen abgeleitet für den Faktor der Lumineszenzdepolarisation (Y), für die Spin-Gitter-Relaxationszeit (T1C) und für den Kern-Overhauser-Effekt (NOE) der 13C-Kerne. Die Besonderheiten des Verhaltens der Größen Y,T1C und NOE spiegeln die charakteristischen Eigenschaften der “longitudinalen” und der “transversalen” Relaxationsprozesse wider.
    Notes: In the frame work of the tetrahedral lattice model with a three-unit kinetic element, the time correlation functions were found. These functions describe the dynamics of “longitudinal” and “transverse” components of the emitting oscillator vector of the luminescent marker included in the side group or the dynamics of the internuclear vector of 13C-1H. The expressions were obtained for the factor of luminescence depolarization (Y), the spin-latice relaxation time (T1C) and for the nuclear Overhauser effect (NOE) of the 13C nuclei. The specific features of the behaviour of Y, T1C and NOE reflect the spectral characteristics of “longitudinal” and “transverse” relaxation processes.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1992.010430301
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