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  • Polymer and Materials Science  (1)
  • 1980-1984  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 248-251 
    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: The electronic structure and conformation of PVC-oligomer models is investigated, using the EHMO (extended Hückel) approximation. Calculated geometries of conformers are near those with idealized torsional angles. Syndiotactic PVC sequences are by 6 kJ mol-1 more stable than the isotactic helical structure. For changing the conformation of 2,4-dichloropentane a coupled internal rotation of neighbouring C—C bonds is important.
    Notes: Die Elektronenstruktur und Konformation von PVC-Oligomer-Modellen wird mit Hilfe der semiempirischen EHMO (erweiterter Hückel)-Methode untersucht. Berechnete Konformergeometrien liegen in der Nähe der idealisierten Torsionswinkel. Syndiotaktische PVC-Sequenzen sind ca. 6 kJ mol-1 stabiler als eine isotaktische Helix. Für den Konformationswechsel im 2,4-Dichlorpentan ist die gekoppelte innere Rotation um benachbarte C—C-Bindungen wesentlich.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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