The effect of a magnetic field on the generation of free radicals in the interaction of quaternary ammonium compounds with hydroperoxides

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Resumo

The magnetic effects (ME) of a moderate magnetic field (MF, 600 mT) on the rate of radical generation (Wi) in mixed micellar systems of quaternary ammonium compounds with hydroperoxides (QAC-ROOH), measured by the inhibitor method, and the effect of magnetic field on the rate of radical polymerization initiated by radicals, generated from the surface by QAC chemisorbed on a solid carrier upon interaction with hydroperoxide dissolved in the monomer are compared. It has been established that in micellar solutions MF reduces Wi, ME ≈ –0.45. In the case of radical polymerization of styrene containing cumyl hydroperoxide on the surface of mica plates with a chemisorbed monolayer of QAC (CTAB or ACh), the polymerization rate increases in MF.

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Sobre autores

D. Krugovov

Semenov Federal Research Center for Chemical Physics of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: kagur1982@mail.ru
Rússia, Moscow

A. Gatin

Semenov Federal Research Center for Chemical Physics of the Russian Academy of Sciences

Email: kagur1982@mail.ru
Rússia, Moscow

N. Potapova

Semenov Federal Research Center for Chemical Physics of the Russian Academy of Sciences

Email: kagur1982@mail.ru
Rússia, Moscow

V. Kondratovich

Semenov Federal Research Center for Chemical Physics of the Russian Academy of Sciences

Email: kagur1982@mail.ru
Rússia, Moscow

E. Mengele

Semenov Federal Research Center for Chemical Physics of the Russian Academy of Sciences

Email: kagur1982@mail.ru
Rússia, Moscow

O. Kasaikina

Semenov Federal Research Center for Chemical Physics of the Russian Academy of Sciences

Email: kagur1982@mail.ru
Rússia, Moscow

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2. Fig. 1. a – Change in the UV absorption spectra of quercetin upon interaction with radicals formed in the system 1 mM CPB + 20 mM tert-butyl hydroperoxide in a chlorobenzene solution; [Q]0 = 0.04 mM, 22°C; b – Kinetic curves of quercetin consumption in the system 1 mM CPB + 20 mM TBHP; curves 1′ and 2′ – in a magnetic field of 600 mT, curves 1 and 2 – in the control; [Q] = A/ε, ε = 3 ‧ 104 l/(mol ‧ cm).

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3. Fig. 2. Surface morphology of mica plates with a chemisorbed CTAB monolayer: a – initial plate; b, c – plates kept for 1 day in a solution of 50 mM cumyl hydroperoxide in styrene; b – control without MP; c – polymerization in a magnetic field of 600 mT (see Table 2).

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4. Fig. 3. Same as Fig. 2, but with a chemisorbed ACh monolayer. Designations are the same as in Fig. 2.

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