EFFECTS OF ELECTRON DONORS ON MgCl2 SUPPORTED CATALYSTS SYSTEM FOR POLYMERIZATION OF PROPYLENE

ZHANG Ming-hui; XIAO Shi-jing

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EFFECTS OF ELECTRON DONORS ON MgCl2 SUPPORTED CATALYSTS SYSTEM FOR POLYMERIZATION OF PROPYLENE

Research Article | 更新时间：2021-03-19

- EFFECTS OF ELECTRON DONORS ON MgCl2 SUPPORTED CATALYSTS SYSTEM FOR POLYMERIZATION OF PROPYLENE
- Acta Polymerica Sinica Issue 5, Pages: 532-538(1991)
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- Published：20 October 1991，
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ZHANG Ming-hui, XIAO Shi-jing. EFFECTS OF ELECTRON DONORS ON MgCl2 SUPPORTED CATALYSTS SYSTEM FOR POLYMERIZATION OF PROPYLENE. [J]. Acta Polymerica Sinica (5):532-538(1991)
DOI：

ZHANG Ming-hui, XIAO Shi-jing. EFFECTS OF ELECTRON DONORS ON MgCl2 SUPPORTED CATALYSTS SYSTEM FOR POLYMERIZATION OF PROPYLENE. [J]. Acta Polymerica Sinica (5):532-538(1991) DOI：

摘要

研究了不同给电子体分别作为内给电子体(Din)和外给电子体(Dex)对MgCl2载体催化剂体系活性和定向性能的影响。还讨论了Din和Dex的搭配作用。烷氧基硅烷、苯甲酸乙酯(EB)、邻苯二甲酸二异丁酯(DIBP)和2

6-四甲基哌啶(TMP)用作Dex

可以明显改善聚丙烯的等规度

而同时使催化活性大大降低。EB、DIBP和TMP用作Din的效果则各不相同。烷氧基硅烷等Dex提高等规度的作用是由于它们选择性地使无规活性中心失活大大高于等规活性中心。适当的Din和Dex搭配

可以获得兼具高活性和高定向性能的催化剂体系。

Abstract

The effects of different electron donors such as ethyl benzoate(EB) diisobutyl phthalate (DIBP)

6-tetramethyl piperidine(TMP) and various silanes as internal donor (Din) and external donor(Dex) respectively were investigated.The possible synergistic effect of Din and Dex was discussed.It was found that EB

DIBP

TMP and alkoxysilanes used as Dex could evidently improve the stereospecificity accompanied with a decrease of the activity

while the effects of EB

DIBP and TEM used as Din are quite differet from each other. The effects of increasing the stereospecilicity is due to deactivation of different selectivity for both atactic and isotatic active centers and the deactivation of atacitic active centers is much greater than that of isotactic active centers. Cooperation of appropriate Din and Dex would give good catalytic performance with high activity andhigh stereospectifity.

关键词

给电子体丙烯聚合MgCl2载体催化剂

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