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  • 1
    Electronic Resource
    Electronic Resource
    Solid-state thermal polymerization of the heterocyclic HC7N7 acid (1985)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 23 (1985), S. 1137-1144 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The preparation of a new type of thermally stable (up to 385°C) heterocyclic polymer, containing a five-membered fused ring system, is described. The ultraviolet, visible, and infrared spectra indicate that this solid-state polymerization probably proceeds via formation of an azomethine-type intermolecular crosslink, rather than via opening of the C4N4 ring system. The reaction is facilitated by the presence of reactive protons, which act as an efficient catalyst for this nucleophilic addition to the nitrile group. It is suggested that this type of solid-state polymerization may possibly be carried out on a single HC7N7 crystal resulting in a fully ordered macroscopic polymer single crystal.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1985.170230418
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  • 2
    Electronic Resource
    Electronic Resource
    On the anionic polymerization of cyanogen (1985)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 23 (1985), S. 107-117 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of anionic initiators with cyanogen was investigated by ultraviolet, visible, and infrared spectroscopy. It is argued that the reaction proceeds via formation of an analog of the heterocyclic anion C7N7- previously known from the reaction of KCN with (CN)2. The analytical results and spectra of the final black product were indicative of the possible formation of open-structured C7N7- dimers. A molecular model of the dimer suggests why the polymerization might terminate at the dimer stage. The pyrolysis of the cyclic acid HC7N7 was studied with the aim of determining the structure and mechanism of the formation of the resulting black product. It is suggested that this thermally induced polymerization reaction probably proceeds via formation of azomethine-type intermolecular crosslinks and may serve as a model for the investigation of the mechanism of nitrile polymerization in pyrolyzed acrylonitrile polymers.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1985.170230111
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    Paper (German National Licenses)
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