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

IF 1.4 4区化学 Q4 CHEMISTRY, PHYSICAL

Kinetics and Catalysis Pub Date : 2025-06-19 DOI:10.1134/S0023158424602237

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

引用次数: 0

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.

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2,6-二甲基吡啶修饰Ti(Oi-C3H7) 4-Al (C2H5)2Cl/Mg(C4H9)2模型催化剂体系的双特异性活性中心

本文介绍了2,6-二甲基吡啶（鲁替丁）在伪均相催化剂体系Ti(Oi-C3H7) 4-Al (C2H5)2Cl/Mg(C4H9)2催化丙烯聚合反应中的改性作用。该催化剂体系为分析负载型Ziegler-Natta聚合催化剂的改性剂效应（“外部给体”效应）提供了方便的模型。在2,6-二甲基吡啶存在的情况下，用该催化剂制备的聚丙烯的IR、13C NMR和GPC数据表明，该改性剂将部分立体特异性活性中心（生成无规聚丙烯的中心）转化为共规性中心。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Kinetics and Catalysis 化学-物理化学

CiteScore

2.10

自引率

27.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Kinetics and Catalysis Russian is a periodical that publishes theoretical and experimental works on homogeneous and heterogeneous kinetics and catalysis. Other topics include the mechanism and kinetics of noncatalytic processes in gaseous, liquid, and solid phases, quantum chemical calculations in kinetics and catalysis, methods of studying catalytic processes and catalysts, the chemistry of catalysts and adsorbent surfaces, the structure and physicochemical properties of catalysts, preparation and poisoning of catalysts, macrokinetics, and computer simulations in catalysis. The journal also publishes review articles on contemporary problems in kinetics and catalysis. The journal welcomes manuscripts from all countries in the English or Russian language.