Abstract
With the use of 29Si NMR spectroscopy, gas–liquid chromatography, viscometry, refractometry, and gel permeation chromatography, the process of copolymer formation during anionic copolymerization of octamethylcyclotetrasiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, and 1,3,5-trimethyl-1,3,5-triphenylcyclotrisiloxane in the presence of the molecular-weight regulators hexamethyldisiloxane or trimethylsilanol has been studied. It has been shown that anionic copolymerization of the above cyclosiloxanes proceeds in two stages. At the first stage, poly(methylphenylmethylvinyl)siloxane with a structure varying from block to random is formed, and, at the second stage, octamethylcyclotetrasiloxane enters into the reaction to yield a random copolymer of a desired composition via chain transfer reactions. Under conditions of anionic copolymerization, hexamethyldisiloxane is inefficient as a chain-terminating agent owing to its low reactivity, whereas trimethylsilanol participates in copolymerization and controls the molecular weight of the copolymer through the reaction of proton–cation exchange with the propagating macroanion.
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Original Russian Text © I.Yu. Ruskol, A.R. Dolotko, V.V. Kireev, A.K. Shestakova, E.I. Alekseeva, V.Yu. Khudoleeva, S.R. Nanush’yan, 2015, published in Russian in Vysokomolekulyarnye Soedineniya, Ser. B, 2015, Vol. 57, No. 4, pp. 274–280.
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Ruskol, I.Y., Dolotko, A.R., Kireev, V.V. et al. Terpolymerization of cyclosiloxanes with various substituents at the silicon atoms. Polym. Sci. Ser. B 57, 330–335 (2015). https://doi.org/10.1134/S1560090415040090
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DOI: https://doi.org/10.1134/S1560090415040090