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Abstract <p>The article describes a modifying effect of 2,6-dimethyl pyridine (lutidine) in propylene polymerization reactions with a pseudo-homogeneous catalyst system Ti(O<i>i-</i>C<sub>3</sub>H<sub>7</sub>)<sub>4</sub><b>–</b>Al(C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>Cl/Mg(C<sub>4</sub>H<sub>9</sub>)<sub>2</sub>. This catalyst system is a convenient model for the analysis of modifier effects (effects of “external donors”) in supported Ziegler–Natta polymerization catalysts. A combination of IR, <sup>13</sup>C NMR and GPC data for polypropylene prepared with this catalyst in the presence of 2,6-dimethyl pyridine shows that the modifier converts a part of stereo-aspecific active centers (the centers producing atactic polypropylene), into syndiospecific centers.</p>

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Syndiospecific Active Centers in a Model Catalyst System Ti(Oi-C3H7)4–Al(C2H5)2Cl/Mg(C4H9)2 Modified with 2,6-Dimethyl Pyridine

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Y. V. Kissin,
  • L. A. Rishina,
  • S. S. Lalayan,
  • V. G. Krasheninnikov,
  • S. S. Gusarov

摘要

Abstract

The article describes a modifying effect of 2,6-dimethyl pyridine (lutidine) in propylene polymerization reactions with a pseudo-homogeneous catalyst system Ti(Oi-C3H7)4–Al(C2H5)2Cl/Mg(C4H9)2. This catalyst system is a convenient model for the analysis of modifier effects (effects of “external donors”) in supported Ziegler–Natta polymerization catalysts. A combination of IR, 13C NMR and GPC data for polypropylene prepared with this catalyst in the presence of 2,6-dimethyl pyridine shows that the modifier converts a part of stereo-aspecific active centers (the centers producing atactic polypropylene), into syndiospecific centers.