Abstract
The syndiospecific polymerization of styrene is studied in the presence of titanium complexes with dialkanolamines—bistitanocanes and titanocane—activated by individual MAO or the combined cocatalyst MAO/TIBA. It is shown that these catalysts are more active and stereospecific after their activation with the combined cocatalyst ([TIBA]: [MAO] ≤ 0.13) than that in the case of the activation with MAO: The activities of the catalysts are ≤18 and 9 kg PS/(mol Ti h), and the syndiotacticities of PS are ≤76 and 60%, respectively. Polymers synthesized in the presence of bistitanocanes are characterized by M n ≤ 4.5 × 104 and T m ≤ 268°C and a narrow molecular-mass distribution (≤2.5).
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Original Russian Text © I.V. Vasilenko, S.V. Kostjuk, K.V. Zaitsev, P.M. Nedorezova, D.A. Lemenovskii, S.S. Karlov, 2010, published in Russian in Vysokomolekulyarnye Soedineniya, Ser. B, 2010, Vol. 52, No. 3, pp. 506–514.
This work was supported by the Russian Foundation for Basic Research (project no. 08-03-90021-Bel-a) and the Belarussian Republican Foundation for Basic Research (project nos. X08P-199 and X06P-165).
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Vasilenko, I.V., Kostjuk, S.V., Zaitsev, K.V. et al. Syndiospecific polymerization of styrene in the presence of new titanium complexes with dialkanolamines: Titanocanes and bistitanocanes. Polym. Sci. Ser. B 52, 136–143 (2010). https://doi.org/10.1134/S1560090410030036
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DOI: https://doi.org/10.1134/S1560090410030036