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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 26 (1984), S. 621-636 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mechanism of unimolecular 1,1-elimination of H2 from carbocations has been investigated by the semiempirical MNDO method in view of its very good performances in the analogous elimination from H2CO. Contrary to previous suggestions, the critical configuration obtained at the MNDO level is characterized by a reduced symmetry with respect to the reacting molecule and by a very short H—H distance. RRKM computations of the rate constants and isotope effect employing MNDO results for the activation energies and vibrational frequencies indicate also that the present, nonsynchronous mechanism is compatible with all the available experimental data.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 187 (1991), S. 75-86 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Das Hochgeschwindigkeits-Schlagverhalten von Kautschuk-modifizierten Epoxidharzen wurde untersucht. Die Zähigkeit der verschiedenen Epoxid-Kautschuk-Systeme wurde anhand von Schlag-Zug-Versuchen ermittelt. Die Bruchflächen wurden raster-elektronenmikroskopisch bewertet. Die Kombination eines festen Fluor-Kautschuks mit einem allgemein verwendeten, carboxyterminierten Butadien-Acrylnitril-Kautschuk erwies sich als sehr effektiv.Es wurde versucht, zwischen dem beobachteten Bruchverhalten und der transmissionselektronenmikroskopisch bestimmten Morphologie eine Korrelation herzuleiten.
    Notes: In the present work the impact behaviour at high speed of rubber-modified epoxy resins has been investigated. Impact-tension measurements have been performed to evaluate the toughness of different systems. A detailed post-failure observation of the fracture surfaces has been made through scanning electron microscopy (SEM). A combination of a solid fluorinated rubber with the generally used carboxy-terminated butadiene-acrylonitrile rubber (CTBN) was found to be very effective.A correlation was tempted between the observed fracture behaviour and the bulk morphology, examined by transmission electron microscopy (TEM).
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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