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  • Articles: DFG German National Licenses  (4)
  • radical addition  (2)
  • reactivity  (2)
  • 05.10.Ln  (1)
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  • Articles: DFG German National Licenses  (4)
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Years
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Critical behavior of frustrated systems: Monte Carlo simulations versus renormalization group (2000)
    Springer
    JETP letters 72 (2000), S. 337-340 
    Details
    ISSN: 1090-6487
    Keywords: 75.10.−b ; 64.60.Ak ; 64.60.Cn ; 05.10.Ln
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the critical behavior of frustrated systems by means of the Padé-Borel resummed three-loop renormalization group expansions and numerical Monte Carlo simulations. Amazingly, for six-component spins, where the transition is second-order, both approaches disagree. This unusual situation is analyzed both from the point of view of the convergence of the resummed series and from the possible relevance of nonperturbative effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1328451
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electronegativity scheme for reactions involving radical addition to vinyl monomers (1992)
    Springer
    Russian chemical bulletin 41 (1992), S. 1750-1755 
    Details
    ISSN: 1573-9171
    Keywords: vinyl monomers ; radical addition ; reactivity ; correlation schemes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The concept of the apparent electronegativity of a reaction site has been introduced. This has been used to develop a new scheme for calculating the relative rate constants of addition of radicals with different structures to vinyl monomers. The parameters of the scheme are given for 40 reagents. The results of a comparison of calculated and literature rate constants of addition are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00863803
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Rate constants for addition of phenoxyl radicals to the vinyl monomer double bond (1992)
    Springer
    Russian chemical bulletin 41 (1992), S. 2147-2151 
    Details
    ISSN: 1573-9171
    Keywords: vinyl monomers ; radical oxidation ; inhibitors ; phenols ; reactivity ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Rate constants were measured for the addition of the 2,4,6-tri(tert-butyl)phenoxyl radical (logk 10, [liter/(mole · sec)]) to the double bond of styrene (9.73 − 4621/T), methyl methacrylate (10.1 − 4972.7/T) and butylacrylate (7.68 − 4313.9/T); and for addition of the 2,4,6-tribromophenoxyl radical to styrene (k 10=0.5;T=323 K). A simulation based on these constants for the inhibited oxidation of styrene under conditions similar to those of monomer storage demonstrated the need to take account of this reaction when analyzing kinetic schemes describing the inhibited oxidation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01150736
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Transition states in the reaction of radical addition to the vinyl double bond (1993)
    Springer
    Russian chemical bulletin 42 (1993), S. 640-644 
    Details
    ISSN: 1573-9171
    Keywords: vinyl monomers ; radical addition ; MO calculations ; transition states of reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The transition states for the addition of.CH3, CH3O.,.CCl3,.CF3, and HOO. radicals to the Cβ and Cα atoms of ethylene, propylene, styrerie, acrylonitrile, methyl acrylate, vinyl acetate, and vinyl- and vinylidene chlorides were calculated using the MNDO method. A satisfactory correlation between the heats of reaction and activation energies was found. The calculated coefficients of proportionality, 0.4–0.5, are twice as high as those in the Polyani—Semenov equation. The calculated heat of reaction of radical addition was shown to be as «strong» an index of reactivity as the calculated activation barrier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00703996
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    Paper (German National Licenses)
    Fulltext
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