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  • 1
    Electronic Resource
    Electronic Resource
    Chemische Kopplung von Polystyrol und Polybutadien in Schmelzemischungen durch Verwendung eines organischen Sulfonylazids (1993)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 204 (1993), S. 177-189 
    Details
    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: Investigations on chemical coupling of heterogeneous polystyrene-polybutadiene blends were carried out using an organic sulfonylazide. The coupling process was realized in the melt mixing process on a laboratory melt kneader. The efficiency of the coupling agent was evaluated by IR-spectroscopical, microscopical, and dynamic-mechanical analysis and by mechanical properties of the blends. The graft copolymers forming in the melt cause an increase of the stress-strain properties and the impact strength of the blends.
    Notes: Es wurden Untersuchungen zur chemischen Kopplung heterogener Polystyrol-Polybutadien-Blends bei Einsatz eines organischen Sulfonylazids während des Schmelzemischens im Laborinnenmischer angestellt. Die Wirksamkeit des Kopplungsagens wurde anhand infrarotspektroskopischer, mikroskopischer und dynamisch-mechanischer Analysen sowie anhand des merchanischen Eigenschaftsbildes der Belends beurteilt. Die sich in der Schmelze bildenden Pfropfcopolymeren führen zu einer Erhöhung der Phasenwechselwirkungen un dami zu einer Verbesserung der Festigkeits- und Zähigkeits-eigenschaften der Blends.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1993.052040116
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Synthese und Reduktion des Tetra-tert-butyltetraoxocalix[4]arens (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 81-87 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 5,11,17,23-Tetra-tert-butyl-25,26,27,28-tetrahydroxy-2,8,14,20-tetraoxocalix[4]arene (4) was synthesized by oxidation of the tetraacetate of 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrahydroxycalix[4]arene (1). Compound 4 was characterized by chemical and spectroscopic methods. Reduction of 4 with hydrazine forms the starting material 1. 4 reacts with sodium borohydride to give 5,11,17,23-tetra-tert-butyl-2,8,14,20,25,26,27,28-octahydroxycalix[4]arene (6).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910106
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    Paper (German National Licenses)
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