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The Dispersion Composition of Polymethylmethacrylate Suspensions and Molecular Weights of Polymers Obtained by Suspension Polymerization in the Presence of Acrylic Copolymers as Surfactants

https://doi.org/10.32362/2410-6593-2019-14-2-51-59

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Abstract

The dispersion composition of polymer suspensions and molecular weights of polymers obtained by suspension polymerization of MMA in the presence of polymer surfactants – methylmethacrylate and methacrylic acid copolymers – were studied. It is shown that a highly dispersed fraction of particles with diameters of 0.02–2.0 µm and a fraction of particles with large diameters (up to 1000 µm) are always present in the polymer suspension. After fractionation of polymer suspensions 3 fractions of particles with different diameters were obtained. For each particle fraction the molecular masses of polymers were determined by viscometry. A significant difference in the values of the molecular masses of polymers obtained as particles of small and large diameters – 105 and 106 Da, respectively – is shown. The presence of a highly dispersed fraction of particles in which a polymer of high molecular weight is formed has a noticeable effect on the average molecular weight of the polymer. In particles of small diameter polymerization takes place according to a mechanism close to the emulsion, due to the fact that the volume of such particles contains a small amount of radicals. The high rate of polymerization leads to the formation of a polymer of high molecular weight, the appearance of a gel effect and a decrease in the termination constant. In most particles, polymerization proceeds by a mechanism close to the solution polymerization, and polymers of low molecular weight are formed. This makes it possible to synthesize polymers of a given molecular weight in drops of certain dispersity.

About the Authors

I. A. Gritskova
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

D.Sc. (Chemistry), Professor, Professor of the S.S. Medvedev Chair of Сhemistry and Technology of Macromolecular Compounds

86, Vernadskogo pr., Moscow, 119571, Russia



O. A. Satskevich
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Post-graduate Student of the S.S. Medvedev Chair of Chemistry and Technology of Macromolecular Compounds

86, Vernadskogo pr., Moscow, 119571, Russia



E. S. Klyuzhin
JSC «Academician V.A. Kargin Research Institute of Chemistry and Technology of Polymers with a Pilot Plant»
Russian Federation

D.Sc. (Chemistry), Leading Researcher of the Department of Radical Polymerization

606000, Russia, Dzerzhinsk



A. I. L’vovskiy
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Engineer of the 1st category of the K.A. Bolshakov Chair of Chemistry and Technology of Rare and Scattered Elements, Nanoscale and Composite Materials

86, Vernadskogo pr., Moscow, 119571, Russia



A. V. Andreeva
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Ph.D. (Chemistry), Leading Engineer of the S.S. Medvedev Chair of Chemistry and Technology of Macromolecular Compounds

86, Vernadskogo pr., Moscow, 119571, Russia



N. S. Мukha
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Student of the S.S. Medvedev Chair of Chemistry and Technology of Macromolecular Compounds

86, Vernadskogo pr., Moscow, 119571, Russia



M. I. Haddaj
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

D.Sc. (Chemistry), Professor of the S.S. Medvedev Chair of Chemistry and Technology of Macromolecular Compounds

86, Vernadskogo pr., Moscow, 119571, Russia



S. M. Levachev
Lomonosov Moscow State University
Russian Federation

D.Sc. (Chemistry), Associate Professor, Chemistry Faculty

1, Leninskie Gory, Moscow 119899, Russia



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Supplementary files

1. Fig. 1. Conversion curves. The time for suspension polymerization of MMA in the presence of different surfactants: 1 – AMPSA; 2 – VPRG; 3 – AMPSA-MMA.
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For citation:


Gritskova I.A., Satskevich O.A., Klyuzhin E.S., L’vovskiy A.I., Andreeva A.V., Мukha N.S., Haddaj M.I., Levachev S.M. The Dispersion Composition of Polymethylmethacrylate Suspensions and Molecular Weights of Polymers Obtained by Suspension Polymerization in the Presence of Acrylic Copolymers as Surfactants. Fine Chemical Technologies. 2019;14(2):51-59. (In Russ.) https://doi.org/10.32362/2410-6593-2019-14-2-51-59

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ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)