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  • 1
    Electronic Resource
    Electronic Resource
    Copolymerisation von Vinylacetat und Divinyladipat Reaktivität der anhängenden Doppelbindungen (1978)
    Springer
    Monatshefte für Chemie 109 (1978), S. 215-219 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The weight average degree of polymerization of vinyl acetate-divinyl adipate copolymers (low content of divinyl adipate) is measured at conversions up to 22%. From thisk 13/k 12 (rate constants of reaction of growing radicals with pendent double bonds and divinyl adipate double bonds, respectively) is calculated to be 0.28. A quantitative relation for the gel point (critical conversion) is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00911963
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  • 2
    Electronic Resource
    Electronic Resource
    Der Gegenionen-Effekt bei der durch Perchlorsäure initiierten Polymerisation von Styrol (1979)
    Springer
    Monatshefte für Chemie 110 (1979), S. 1029-1043 
    Details
    ISSN: 1434-4475
    Keywords: Cationic polymerisation ; kinetics of ; Counterion effect ; Gel permeation chromatography ; Motecular weight distribution ; Styrene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The effect of various counter-ions has been investigated in the cationic polymerisation of styrene in 1,2-dichloroethane at different temperatures (238 K, 253 K). The soluble silver salts of the corresponding acids HBF4, HClO4, HPF6, HAsF6, and HSbF6 were added to the reaction medium before initiation by perchlorid acid. Monomer consumption is seen to be incomplete under these circumstances. Initial polymerisation rates and the final degree of monomer conversion rise with decreasing nucleophilicity of the counter-ions. A kinetic scheme is proposed which is able to describe the course of polymerisation and gives the approximate values of the rate constants for propagation, termination and chain transfer reactions, respectively. The information obtained from GPC-measurements on the polymeric products supports the view that chain propagation takes place by at least two different forms of active species, the ratio of which is strongly determined by the nature of the added silver salt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00910951
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  • 3
    Electronic Resource
    Electronic Resource
    Acrylic acid popcorn polymers (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 2597-2604 
    Details
    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: Polyacrylsäure ist in seinem reinen Monomeren nicht löslich. Bei der Polymerisation von Acrylsäure in Substanz entstehen nebeneinander transparentes glasiges und opakes Polymers, aber kein Popcornpolymeres. Durch Zusatz von Wasser zum Monomeren wird die Bildung und Proliferation von Popcornpolymeren während der Polymerisation bewirkt. Die Entstehung von Popcornpolymeren wird auf das bessere Lösungsvermögen des Monomer/Wasser-Gemisches für die Polyacrylsäure im Vergleich zur Lösungsmittelqualität des reinen Monomeren zurückgeführt.
    Notes: Poly(acrylic acid) is not soluble in the pure monomer. In the polymerization of acrylic acid in bulk, both glassy and opaque polymer is obtained but no popcorn polymer. Formation and proliferation of popcron polymer takes place during polymerization by adding water to the monomer. The better solvent quality of the monomer/water mixture for poly(acrylic acid) compared to the solvent quality of pure monomer is considered to be the cause for popcorn polymer formation.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750907
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