Abstract
The cationic polymerization of styrene initiated by the system 2-chloro-2-phenylpropane–TiCl4–pyridine is studied in a mixture CH2Cl2–n-hexane at a temperature of –80°С. It is shown that under these conditions polymerization occurs via the living mechanism at [monomer]: [initiator] ≤ 100. The method of preparing polystyrenes with terminal primary hydroxyl groups (Mn = 4000–10000 g/mol) by the sequential controlled cationic polymerization of styrene and the in situ alkylation of 4-phenoxy-1-butanol by polystyrene macrocations is proposed. The resulting functionalized polystyrenes are used as macroinitiators of anionic-coordination ring-opening polymerization of D,L-lactide in the presence of tin bis(2-ethyl hexanoate) [Sn(Oct)2] in toluene at 80°С. Copolymers polystyrene-block-poly(D,L-lactide) with the controlled length of the poly(D,L-lactide) block (Mn = 10000–17000 g/mol) and a relatively low molecular-weight distribution (Mw/Mn = 1.6–1.8) are synthesized. Formation of the block copolymers is confirmed by 1Н NMR spectroscopy, gel-permeation chromatography, and atomic force microscopy.
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Original Russian Text © P.A. Nikishev, Yu.A. Piskun, I.V. Vasilenko, L.V. Gaponik, P.S. Timashev, A.A. Akovantseva, S.V. Kostjuk, 2017, published in Vysokomolekulyarnye Soedineniya, Seriya B, 2017, Vol. 59, No. 6, pp. 413–423.
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Nikishev, P.A., Piskun, Y.A., Vasilenko, I.V. et al. Synthesis of Block Copolymers of Styrene with D,L-Lactide by the Sequential Controlled Cationic Polymerization and Ring-Opening Anionic Polymerization. Polym. Sci. Ser. B 59, 655–664 (2017). https://doi.org/10.1134/S1560090417060070
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DOI: https://doi.org/10.1134/S1560090417060070