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  • Polymer and Materials Science  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 32 (1973), S. 177-180 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 53 (1976), S. 65-72 
    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: Die Polymerisation von Methylmethacrylat wurde in Schwefeldioxid enthaltendem Wasser in Gegenwart von Graphitpulver durchgeführt. Die Polymerisation wurde mit einer Redoxreaktion zwischen in Graphit enthaltener Asche und HSO⊖3 gestartet. In PMMA eingekapseltes Graphitpulver wurde in hoher Ausbeute erhalten.Polymerisationsmechanismus und Einkapselung werden diskutiert.
    Notes: The polymerization of methyl methacrylate was carried out in the presence of graphite powder in water medium containing sulfur dioxide. The polymerization was initiated by a redox reaction between ash in graphite and HSO3⊖. Graphite powder encapusulated with polymethyl methacrylate was obtained in high yield.The mechanism of the polymerization and the capusulation are discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 85 (1980), S. 201-203 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 85 (1980), S. 197-199 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 113 (1983), S. 43-51 
    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: Die anionische Polymerisation von Styrol mit Naphthalin-Natrium wurde mit einem Rotations-Scheiben-Reaktor durchgeführt. Die Art der Zerteilung der Polymerisationsmischung änderte sich von tropfenweise zu filamentartig und schließlich filmartig innerhalb weniger Minuten bei niedriger Umdrehungsgeschwindigkeit und großer Flußmenge. Bei hoher Umdrehungsgeschwindigkeit und kleiner Flußmenge wurde nur tropfenweise Aufteilung beobachtet, und ein Perlpolymerisat mit unimodaler Molekulargewichtsverteilung wurde erhalten. Das Polymer erlangt eine bimodale Verteilung, wenn die Polymerisation auf der rotierenden Scheibe abgebrochen wird. Die Ergebnisse werden durch die Annahme erklärt, daß sich nahe der Scheibenoberfläche eine hochviskose Schicht ausbildet.
    Notes: Anionic polymerization of styrene with sodium naphthalene was carried out using the rotating disk reactor. The mode of disintegration of the polymerization mixture changed from dropwise to filamentwise and finally to filmwise within a few minutes of reaction at low speed revolution and a large amount of flow. Under the condition of high speed revolution and a small amount of flow, only dropwise disintegration was observed and a beadlike polymer was obtained having a unimodal molecular weight distribution. The polymer was found to have a bimodal distribution when the polymerization was terminated on the rotating disk. These results are explained by assuming that a highly viscous layer was formed near the disk surface.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 112 (1968), S. 40-48 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die kationische Polymerisation von Formaldehyd bei tiefer Temperatur wurde untersucht. Bei der Polymerisation in Alkanen mit LEWIS- oder BRÖNSTED-Säuren, J2, JCl, JCl3, JBr, SO2 sowie binären Systemen aus SO2 und den vorstehenden Verbindungen entstehen hochmolekulare Polyoxymethylene mit reduzierten Viskositäten über l dl/g. Der Polymerisationsgrad hängt von den Polymerisationsbedingungen, vor allem vom Lösungsmittel und der Polymerisationstemperatur, sowie vom Zusatz übertragender Zusätze wie Wasser, Ameisensäure, Methanol und Methylformiat ab.
    Notes: Cationic polymerization of monomeric formaldehyde has been studied at low temperature. It was found that high molecular weight polyoxymethylene with the reduced viscosity higher than 1.0 dl/g was readily obtained when the polymerization of formaldehyde was carried out in saturated hydrocarbons in the presence of LEWIS acids, BRÖNSTED acids, I2, ICl ICl3, IBr, sulfur dioxide and binary systems of sulfur dioxide with these compounds at considerably low temperature. The degree of polymerization was effected by the polymerization conditions, especially solvent, polymerization temperature and addition of chain transfer agents such as water, formic acid, methanol or methyl formate.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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