Effect of dielectric properties and structure of aqueous solutions of diallylammonium salts on their reactivity in radical polymerization

Autor: A. S. Lileev, Andrey K. Lyashchenko, D. V. Loginova, N. A. Kleshcheva, L. M. Timofeeva
Rok vydání: 2008
Předmět:
Zdroj: Polymer Science Series A. 50:273-282
ISSN: 1555-6107
0965-545X
DOI: 10.1134/s0965545x0803005x
Popis: The complex dielectric permittivity in the frequency range 7.5–25.0 GHz and the low-frequency specific conductivity of aqueous solutions of diallylammonium salts (diallylammonium and diallylmethylammonium trifluoroacetates and diallyldimethylammonium chloride) were measured at 293–308 K over a wide concentration range. On the basis of the results, the parameters of dielectric relaxation were calculated. The number of water molecules in the solvation shell of the salts was estimated. The concentration behavior of the initial rate of radical polymerization of diallylammonium salts and the rate constant of bimolecular chain termination was correlated with the specific features of the structure of aqueous monomer solutions. The role of “free” water in the initial salt solutions was revealed, a species whose presence in the system determines the character of concentration behavior of the rate constants for the elementary steps of polymerization, such as propagation, chain transfer to the monomer, and bimolecular chain termination.
Databáze: OpenAIRE
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