Polymerization of vinyl monomers in the presence of the initiating catalytic complexes “oxopropylidene tertiary aromatic amines – benzoyl peroxide”

Abstract

Initiator systems for radical polymerization, having in its composition of several functional groups of interest in terms of creating new methods to control the polymer chain growth in radical polymerization, as it gives the opportunity to influence the molecular-mass characteristics of the products, on the kinetic parameters of the process, and in some cases, the composition and structure of polymers. The work examines the process of polymerization of vinyl monomers in the presence of a new initiating complexes of N,N’-dioxaphosphorinanes aniline (DOPA) + benzoyl peroxide, N,N’-dioxaphosphorinanes toluidine (DОPT) + benzoyl peroxide) and identified the mechanism of interaction of the initiating agents in the formation of the catalytic complex. In experiments was used a dilatometric technique. The polymerization was carried out at different temperatures (60, 80, 100 °C for styrene and 40, 60, 80 °C for methyl methacrylate). Determination of molecular weight of the styrene and methyl methacrylate were produced on the basis of measurements of the intrinsic viscosity of its solutions in toluene. Analyzed kinetics of radical polymerization of styrene and methyl methacrylate in the presence of initiating agents, benzoyl peroxide and DOPA, benzoyl peroxide and DОPT. Determined kinetic parameters of the polymerization of vinyl monomers in the presence of new catalytic systems. The rate of polymerization significantly depends on the concentration of the initiating agents. At high amine concentrations that exceed the peroxide content, there is a rapid expenditure of benzoyl peroxide. Established that tertiary aromatic amines oxopropylidene affect the increase in the rate of initiation of radical polymerization at moderately low temperatures. The proposed mechanism of radical polymerization of vinyl monomers in the presence of initiating system benzoyl peroxide DOPT.