STUDY ON TiCl4/MgCl2 CATALYSTS FOR PROPYLENE POLYMERIZATION ——THE FUNCTIONS OF THE INTERNAL DONORS IN CATALYST SYSTEMS

ZHONG Chifeng; GAO Mingzhi; MAO Bingquan

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STUDY ON TiCl4/MgCl2 CATALYSTS FOR PROPYLENE POLYMERIZATION ——THE FUNCTIONS OF THE INTERNAL DONORS IN CATALYST SYSTEMS

Research Article | 更新时间：2021-03-19

- STUDY ON TiCl4/MgCl2 CATALYSTS FOR PROPYLENE POLYMERIZATION ——THE FUNCTIONS OF THE INTERNAL DONORS IN CATALYST SYSTEMS
- Acta Polymerica Sinica Issue 2, Pages: 266-271(2003)
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- Published：20 April 2003，
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ZHONG Chifeng, GAO Mingzhi, MAO Bingquan. STUDY ON TiCl4/MgCl2 CATALYSTS FOR PROPYLENE POLYMERIZATION ——THE FUNCTIONS OF THE INTERNAL DONORS IN CATALYST SYSTEMS. [J]. Acta Polymerica Sinica (2):266-271(2003)
DOI：

ZHONG Chifeng, GAO Mingzhi, MAO Bingquan. STUDY ON TiCl4/MgCl2 CATALYSTS FOR PROPYLENE POLYMERIZATION ——THE FUNCTIONS OF THE INTERNAL DONORS IN CATALYST SYSTEMS. [J]. Acta Polymerica Sinica (2):266-271(2003) DOI：

摘要

采用相同制备工艺

制备分别以邻苯二甲酸二异丁酯 (DIBP)和9

9-双(甲氧基甲基 )芴(BMMF)为内给电子体和不加入内给电子体3种催化剂 .研究了它们在无外给电子体时聚合性能

以及合成的聚丙烯的等规度

分子量及其分布 .并采用CRYSTAF和13C-NMR对聚丙烯沸腾庚烷不溶部分结晶性能和序列结构进行分析

结果表明内给电子体对聚丙烯分子链序列结构有很大影响;BMMF催化剂、DIBP催化剂和无内给电子体催化剂合成的聚丙烯规整性依次下降 .对BMMF催化剂

当烷基铝为Et3Al时

铝钛比增加

等规度和活性明显下降 .当烷基铝i-Bu3Al时

铝钛比增加

等规度略微下降而活性增加 ;但是13C-NMR研究发现其(铝钛比为300时)庚烷不溶物的规整性与DIBP催化剂的庚烷不溶物的规整性一致 .这表明内给电子体在聚合中的作用不在于是酯还是醚

在于它与氯化镁的络合强度.络合越强

得到的聚丙烯分子链越规整.

Abstract

Three N-catalyst systems were prepared

which contain free donor or different internal donors such as diisobutyl phthalate (DIBP) and 9

9-bis(methoxymethyl) fluorine (BMMF)．The performances of propylene polymerization without external donors in catalyst systems were studied．Poly(propylene)s have been characterized by using gel permeation chromatography (GPC)

crystallization fractionation analysis (CRASTAF) and 13C-NMR analysis．It was found that the catalyst with BMMF as the internal donor resulted in polypropylene of best tacticity．It suggests that the internal donors have important influence on polymer tacticity．The polymerization was performed in the presence of different cocatalysts—Et3Al and i-Bu3Al．It was found that the microstructure of polymers obtained with catalyst BMMF (i-Bu3 Al/Ti=300) was as same as that obtained with catalyst DIBP (Et3 Al/Ti=50)．It indicated that the stereoselectivity of the active site depended on the strength of donor coordination．

关键词

聚丙烯ZieglerNatta催化剂内给电子体烷基铝

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Related Institution

Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology

1,2),GAO Xueqin~2,YUAN Yi~2,SHEN Kaizhi~2

四川大学高分子科学与工程学院高分子材料工程国家重点实验室

四川大学高分子科学与工程学院高分子材料工程国家重点实验室成都

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