SYNTHESIS OF NOVEL HALF-METALLOCENE COMPLEXES ([O,O]CpTiCl) CONTAINING BISPHENOXY LIGANDS AND THEIR CATALYTIC PROPERTIES FOR ETHYLENE POLYMERIZATION

YI Jianjun; YU Peng; XU Xuexiang; ZHAO Wei; JING Zhenhua

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SYNTHESIS OF NOVEL HALF-METALLOCENE COMPLEXES ([O,O]CpTiCl) CONTAINING BISPHENOXY LIGANDS AND THEIR CATALYTIC PROPERTIES FOR ETHYLENE POLYMERIZATION

Research Article | 更新时间：2021-03-19

- SYNTHESIS OF NOVEL HALF-METALLOCENE COMPLEXES ([O,O]CpTiCl) CONTAINING BISPHENOXY LIGANDS AND THEIR CATALYTIC PROPERTIES FOR ETHYLENE POLYMERIZATION
- Acta Polymerica Sinica Issue 3, Pages: 342-346(2001)
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- Published：20 June 2001，
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YI Jianjun, YU Peng, XU Xuexiang, ZHAO Wei, JING Zhenhua. SYNTHESIS OF NOVEL HALF-METALLOCENE COMPLEXES ([O,O]CpTiCl) CONTAINING BISPHENOXY LIGANDS AND THEIR CATALYTIC PROPERTIES FOR ETHYLENE POLYMERIZATION. [J]. Acta Polymerica Sinica (3):342-346(2001)
DOI：

YI Jianjun, YU Peng, XU Xuexiang, ZHAO Wei, JING Zhenhua. SYNTHESIS OF NOVEL HALF-METALLOCENE COMPLEXES ([O,O]CpTiCl) CONTAINING BISPHENOXY LIGANDS AND THEIR CATALYTIC PROPERTIES FOR ETHYLENE POLYMERIZATION. [J]. Acta Polymerica Sinica (3):342-346(2001) DOI：

摘要

制备了含二元芳香酚类配体 [O

O]的茂型钛配合物 [O

O]CpTiCl

并通过元素分析、IR、1 H NMR表征了其组成与结构 .结果表明

二元芳香酚类配体中两个O原子同时与金属中心原子Ti相连

形成环状结构 .研究表明

茂型钛配合物 [O

O]CpTiCl在助催化剂甲基铝氧烷 (MAO)作用下

于 30℃、10 1×105 Pa乙烯压力下即可催化乙烯聚合

并显示较高的活性

远高于未引入配体 [O

O]的CpTiCl3的活性

并且[O

O]CpTiCl的催化活性依非茂酚类配体中芳香环的增大而下降(C6H4O2)>(C12H8O2)>(C20H12O2).此外

O]CpTiCl/MAO体系催化活性随铝/钛比的增加呈上升而后衰减型

当铝钛比为500到3000之间时活性最高

所得聚乙烯具有双峰分布特征

其重均分子量Mw=12.5×104

分子量分布为Mw/Mn=7.4.

Abstract

Synthesis 0f half-metallocene complexes ([O

O]CpTiCl) containing bisphenoxy ligands is discribed

while their composition and structure are characterized by elemental analysis

IR and 1H-NMR

suggesting that the ring structure is formed by the combination of the two oxygen atoms in the biphenol ligand [O

O] and the titanium atom．It is proved by the experiments that [O

O] CpTiCl is active for ethylene polymerization at 30℃ and latm with MAO activation

and exibits much higher activity that CpTiCl3

and the results show that the activity decreases successively with increase in the aromatic ings(C6H4O2)>(C12H8O2)>(C20H12O2)．For the(C6H4O2)CpTiCl/MAO system

the activity is a“up and down” type with increase in the Al／Ti molar ratio

and up to the highest value around 1×105 gPE／molTi·h when the Al/Ti molar ratio is 500 to 3000．The polyethylene obtained is characteristic of bi-model distribution with an average molecular weight Mw=12.5×104 and molecular weight distribution Mw/Mn=7.4

关键词

二元酚茂配合物钛配合物烯烃聚合物催化剂

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