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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of a propene - methyl methacrylate diblock copolymer via “living” coordination polymerization (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 11-15 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A new diblock copolymer of propene and methyl methacrylate (MMA) was prepared by adding MMA during the living coordination polymerization of propene together with the soluble catalyst V(acac)3/Al(C2H5)2Cl at -78°C and subsequently by raising the polymerization temperature up to 25°C. The homopolymerization of MMA with this catalyst exhibits the characteristics of a living polymerization at the initial stage of polymerization. From the copolymerization of MMA with styrene, it was concluded that the polymerization of MMA occurs via a radical intermediate. It is suggested that a propene-MMA diblock copolymer is formed via the transformation of a living polypropylene end to a radical end.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.021860102
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Stereochemistry in “living” coordination polymerization of propene initiated by vanadium-based catalytic systems (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 1827-1833 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Soluble catalysts of V(acac)3 and AIR2X (R = C2H5, n-C3H7, i-C4H9; X = Cl, Br) initiate a living polymerization of propene at -78°C to afford monodisperse polymers of syndiotactic structure. The stereochemistry of the living polymerization was investigated by examining the structures of monomdisperse polypropylenes and of propylene-ethylene block copolymers by means of 13C NMR spectroscopy. It was found that syndiotactic- and regio-specificities of the soluble vanadium-based catalysts are not influenced by the sequence length of the living polymer chain.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850905
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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