Modifications of the Active Sites Distribution in the Ziegler-Natta Polymerization of Propylene Using Lewis Acids

被引：15
|
作者：
Ribour, David [1 ]
Spitz, Roger [1 ]
Monteil, Vincent [1 ]
机构：
[1] Univ Lyon 1, Lab Chim Catalyse Polymeres & Procedes, CNRS, CPE Lyon,LCPP Team,UMR 5265, F-69616 Villeurbanne, France
来源：
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 2010年 / 48卷 / 12期
关键词：
active sites distribution; isotactic; MgCl2-supported catalysts; poly(propylene); Ziegler-Natta polymerization; EXTERNAL DONORS; CATALYSTS; DISCOVERY;
D O I：
10.1002/pola.24043
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Heterogeneous Ziegler-Natta precatalysts (with phthalate as internal donor) were modified by treatments with various Lewis acids (MCln with M = Ga, Sn, Si, and Sb and n = 3, 4, or 5) before their use in the polymerization of propylene. If performed on previously "detitanated" precatalysts, treatments with SnCl4 and SiCl4 lead to a slight activation but especially to an increase of the tacticity whereas GaCl3 and SbCl5 treatments deactivate the catalyst The modification method applied to conventional unmodified precatalysts gave similar trends A significant increase of tacticity (and/or of T-m) and a narrowing of the molecular weight distribution were observed in the case of SnCl4 and SiCl4 treatments (C) 2010 Wiley Periodicals, Inc J Polym Sci Part A Polym Chem 48. 2631-2635, 2010
引用
收藏
页码：2631 / 2635
页数：5
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