2020 (3) 1

https://doi.org/10.15407/polymerj.42.03.151
COMPLEX FORMATION IN THE POLYMERIZATION SYSTEMS WITH HYDROGEN PEROXIDE AS AN INITIATOR
V.P. Boiko,
Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske shosе, Kyiv, 02160, Ukraine
E-mail: boikovital41@i.ua
ORCID: 0000-0002-0157-6664
V.K. Grishchenko
Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske shosе, Kyiv, 02160, Ukraine
E-mail: oligomer8@gmail.com
ORCID: 0000-0002-4951-936X
Polym. J., 2020, 42, no. 3: 151-171.
Section: Review.
Language: Russian.

Abstract:
Consideration of the complexation of components in the polymerization systems becomes an important step in the study of the mechanisms of all stages of the polymerization process. An important role in this process is played by the solvent, which modifies the intermolecular interactions (IMI) between a monomer and an initiator or with both components, leading to unexpected effects that affect both the kinetics of polymerization and the properties of the final products. These effects are especially strong in systems whose components are prone to active IMI. Such systems include mixtures in which hydrogen peroxide (HP) is used as an initiator, capable of acting as an active donor and acceptor of protons in a hydrogen bond. In the preparation of oligodienes with terminal hydroxyl groups, the diene-HP-alcohol system is used. HP molecule forms a π-complex with diene’s double bonds as a hydrogen donor and a hydrogen bond with a solvent, where the peroxide group of HP is solvated by alcohol. The resulting triple complex decomposes into water and two radicals – alcohol hydroxyl-containing and hydroxyl ones, which initiate the polymerization of diene. When using isopropyl alcohol, the alcohol‘s radical contains a tertiary hydroxyl group. This leads to the formation in this alcohol of an oligomer with an effective functionality of 1.5 instead of the expected 2, since the tertiary hydroxyl group is inactive in the urethane formation reaction. It is shown that in this process, the termination of macroradicals occurs by the chain transfer to HP, not by recombination of macroradicals. The new polymerization scheme in the studied system is proposed, taking into account the experimental facts presented. The scheme is confirmed by thermochemical and quantum-chemical calculations and the distribution of oligomer molecules by functionality.

Key words: complex formation, hydrogen peroxide, initiation, termination, functionality.

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